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Message-Id: <20250721-drm-v3-3-e16c3cee7263@gmail.com>
Date: Mon, 21 Jul 2025 11:00:49 +0800
From: LiangCheng Wang <zaq14760@...il.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Sumit Semwal <sumit.semwal@...aro.org>,
Christian König <christian.koenig@....com>,
Wig Cheng <onlywig@...il.com>, LiangCheng Wang <zaq14760@...il.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
linaro-mm-sig@...ts.linaro.org
Subject: [PATCH v3 3/3] drm: tiny: Add support for Mayqueen Pixpaper e-ink
panel
Introduce a DRM driver for the Mayqueen Pixpaper e-ink display panel,
which is controlled via SPI. The driver supports a 122x250 resolution
display with XRGB8888 format.
Also, add a MAINTAINERS entry for the Pixpaper driver.
Signed-off-by: LiangCheng Wang <zaq14760@...il.com>
---
MAINTAINERS | 7 +
drivers/gpu/drm/tiny/Kconfig | 15 +
drivers/gpu/drm/tiny/Makefile | 1 +
drivers/gpu/drm/tiny/pixpaper-regs.h | 428 +++++++++++++++++++
drivers/gpu/drm/tiny/pixpaper.c | 790 +++++++++++++++++++++++++++++++++++
5 files changed, 1241 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 60bba48f5479a025f9da3eaf9dbacb67a194df07..b05b7a0b7a6c4f7b02300da89ac65744f60ee8da 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7758,6 +7758,13 @@ T: git https://gitlab.freedesktop.org/drm/misc/kernel.git
F: Documentation/devicetree/bindings/display/repaper.txt
F: drivers/gpu/drm/tiny/repaper.c
+DRM DRIVER FOR PIXPAPER E-INK PANEL
+M: LiangCheng Wang <zaq14760@...il.com>
+S: Maintained
+F: Documentation/devicetree/bindings/display/mayqueen,pixpaper.yaml
+F: drivers/gpu/drm/tiny/pixpaper-regs.h
+F: drivers/gpu/drm/tiny/pixpaper.c
+
DRM DRIVER FOR QEMU'S CIRRUS DEVICE
M: Dave Airlie <airlied@...hat.com>
M: Gerd Hoffmann <kraxel@...hat.com>
diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
index 06e54694a7f2fe1649e1886f039926b24f698e0d..94a5bf61a115929640022128e20c723ab7c0e735 100644
--- a/drivers/gpu/drm/tiny/Kconfig
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -82,6 +82,21 @@ config DRM_PANEL_MIPI_DBI
https://github.com/notro/panel-mipi-dbi/wiki.
To compile this driver as a module, choose M here.
+config DRM_PIXPAPER
+ tristate "DRM support for PIXPAPER display panels"
+ depends on DRM && SPI
+ select DRM_CLIENT_SELECTION
+ select DRM_GEM_DMA_HELPER
+ select DRM_KMS_HELPER
+ help
+ DRM driver for the Mayqueen Pixpaper e-ink display panel.
+
+ This driver supports small e-paper displays connected over SPI,
+ with a resolution of 122x250 and XRGB8888 framebuffer format.
+ It is intended for low-power embedded applications.
+
+ If M is selected, the module will be built as pixpaper.ko.
+
config TINYDRM_HX8357D
tristate "DRM support for HX8357D display panels"
depends on DRM && SPI
diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile
index 4a9ff61ec25420e2c0a648c04eaab7ca25dd5407..48d30bf6152f979404ac1004174587823a30109e 100644
--- a/drivers/gpu/drm/tiny/Makefile
+++ b/drivers/gpu/drm/tiny/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_DRM_BOCHS) += bochs.o
obj-$(CONFIG_DRM_CIRRUS_QEMU) += cirrus-qemu.o
obj-$(CONFIG_DRM_GM12U320) += gm12u320.o
obj-$(CONFIG_DRM_PANEL_MIPI_DBI) += panel-mipi-dbi.o
+obj-$(CONFIG_DRM_PIXPAPER) += pixpaper.o
obj-$(CONFIG_TINYDRM_HX8357D) += hx8357d.o
obj-$(CONFIG_TINYDRM_ILI9163) += ili9163.o
obj-$(CONFIG_TINYDRM_ILI9225) += ili9225.o
diff --git a/drivers/gpu/drm/tiny/pixpaper-regs.h b/drivers/gpu/drm/tiny/pixpaper-regs.h
new file mode 100644
index 0000000000000000000000000000000000000000..77d9eac81329299dcc32bfd86777d312acf4dd03
--- /dev/null
+++ b/drivers/gpu/drm/tiny/pixpaper-regs.h
@@ -0,0 +1,428 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Register definitions for PIXPAPER e-ink panel
+ *
+ * Author: LiangCheng Wang <zaq14760@...il.com>
+ */
+
+#ifndef __PIXPAPER_REGS_H__
+#define __PIXPAPER_REGS_H__
+
+/*
+ * Note on Undocumented Commands/Registers:
+ *
+ * Several commands and register parameters defined in this header are not
+ * documented in the datasheet. Their values and usage have been derived
+ * through analysis of existing userspace example programs.
+ *
+ * These 'unknown' definitions are crucial for the proper initialization
+ * and stable operation of the panel. Modifying these values without
+ * thorough understanding may lead to display anomalies, panel damage,
+ * or unexpected behavior.
+ */
+
+/* Command definitions */
+#define PIXPAPER_CMD_PANEL_SETTING 0x00 /* R00H: Panel settings */
+#define PIXPAPER_CMD_POWER_SETTING 0x01 /* R01H: Power settings */
+#define PIXPAPER_CMD_POWER_OFF 0x02 /* R02H: Power off */
+#define PIXPAPER_CMD_POWER_OFF_SEQUENCE 0x03 /* R03H: Power off sequence */
+#define PIXPAPER_CMD_POWER_ON 0x04 /* R04H: Power on */
+#define PIXPAPER_CMD_BOOSTER_SOFT_START 0x06 /* R06H: Booster soft start */
+#define PIXPAPER_CMD_DEEP_SLEEP 0x07 /* R07H: Deep sleep */
+#define PIXPAPER_CMD_DATA_START_TRANSMISSION 0x10
+/* R10H: Data transmission start */
+#define PIXPAPER_CMD_DISPLAY_REFRESH 0x12 /* R12H: Display refresh */
+#define PIXPAPER_CMD_PLL_CONTROL 0x30 /* R30H: PLL control */
+#define PIXPAPER_CMD_TEMP_SENSOR_CALIB 0x41
+/* R41H: Temperature sensor calibration */
+#define PIXPAPER_CMD_UNKNOWN_4D 0x4D /* R4DH: Unknown command */
+#define PIXPAPER_CMD_VCOM_INTERVAL 0x50 /* R50H: VCOM interval */
+#define PIXPAPER_CMD_UNKNOWN_60 0x60 /* R60H: Unknown command */
+#define PIXPAPER_CMD_RESOLUTION_SETTING 0x61 /* R61H: Resolution settings */
+#define PIXPAPER_CMD_GATE_SOURCE_START 0x65 /* R65H: Gate/source start */
+#define PIXPAPER_CMD_UNKNOWN_B4 0xB4 /* RB4H: Unknown command */
+#define PIXPAPER_CMD_UNKNOWN_B5 0xB5 /* RB5H: Unknown command */
+#define PIXPAPER_CMD_UNKNOWN_E0 0xE0 /* RE0H: Unknown command */
+#define PIXPAPER_CMD_POWER_SAVING 0xE3 /* RE3H: Power saving */
+#define PIXPAPER_CMD_UNKNOWN_E7 0xE7 /* RE7H: Unknown command */
+#define PIXPAPER_CMD_UNKNOWN_E9 0xE9 /* RE9H: Unknown command */
+
+/* R00H PSR - First Parameter */
+#define PIXPAPER_PSR_RST_N (1 << 0)
+/* Bit 0: RST_N, 1=no effect (default), 0=reset with booster OFF */
+#define PIXPAPER_PSR_SHD_N (1 << 1)
+/* Bit 1: SHD_N, 1=booster ON (default), 0=booster OFF */
+#define PIXPAPER_PSR_SHL (1 << 2)
+/* Bit 2: SHL, 1=shift right (default), 0=shift left */
+#define PIXPAPER_PSR_UD (1 << 3)
+/* Bit 3: UD, 1=scan up (default), 0=scan down */
+#define PIXPAPER_PSR_PST_MODE (1 << 5)
+/* Bit 5: PST_MODE, 0=frame scanning (default), 1=external */
+#define PIXPAPER_PSR_RES_MASK (3 << 6)
+/* Bits 7-6: RES[1:0], resolution setting */
+#define PIXPAPER_PSR_RES_176x296 (0x0 << 6) /* 00: 176x296 */
+#define PIXPAPER_PSR_RES_128x296 (0x1 << 6) /* 01: 128x296 */
+#define PIXPAPER_PSR_RES_128x250 (0x2 << 6) /* 10: 128x250 */
+#define PIXPAPER_PSR_RES_112x204 (0x3 << 6) /* 11: 112x204 */
+#define PIXPAPER_PSR_CONFIG \
+ (PIXPAPER_PSR_RST_N | PIXPAPER_PSR_SHD_N | PIXPAPER_PSR_SHL | \
+ PIXPAPER_PSR_UD)
+/* 0x0F: Default settings, resolution set by R61H */
+
+/* R00H PSR - Second Parameter */
+#define PIXPAPER_PSR2_VC_LUTZ \
+ (1 << 0) /* Bit 0: VC_LUTZ, 1=VCOM float after refresh (default), 0=no effect */
+#define PIXPAPER_PSR2_NORG \
+ (1 << 1) /* Bit 1: NORG, 1=VCOM to GND before power off, 0=no effect (default) */
+#define PIXPAPER_PSR2_TIEG \
+ (1 << 2) /* Bit 2: TIEG, 1=VGN to GND on power off, 0=no effect (default) */
+#define PIXPAPER_PSR2_TS_AUTO \
+ (1 << 3) /* Bit 3: TS_AUTO, 1=sensor on RST_N low to high (default), 0=on booster */
+#define PIXPAPER_PSR2_VCMZ \
+ (1 << 4) /* Bit 4: VCMZ, 1=VCOM always floating, 0=no effect (default) */
+#define PIXPAPER_PSR2_FOPT \
+ (1 << 5) /* Bit 5: FOPT, 0=scan 1 frame (default), 1=no scan, HiZ */
+#define PIXPAPER_PSR_CONFIG2 \
+ (PIXPAPER_PSR2_VC_LUTZ | \
+ PIXPAPER_PSR2_TS_AUTO) /* 0x09: Default VCOM and temp sensor settings */
+
+/* R01H PWR - Power Setting Register */
+/* First Parameter */
+#define PIXPAPER_PWR_VDG_EN \
+ (1 << 0) /* Bit 0: VDG_EN, 1=internal DCDC for VGP/VGN (default), 0=external */
+#define PIXPAPER_PWR_VDS_EN \
+ (1 << 1) /* Bit 1: VDS_EN, 1=internal regulator for VSP/VSN (default), 0=external */
+#define PIXPAPER_PWR_VSC_EN \
+ (1 << 2) /* Bit 2: VSC_EN, 1=internal regulator for VSPL (default), 0=external */
+#define PIXPAPER_PWR_V_MODE \
+ (1 << 3) /* Bit 3: V_MODE, 0=Mode0 (default), 1=Mode1 */
+#define PIXPAPER_PWR_CONFIG1 \
+ (PIXPAPER_PWR_VDG_EN | PIXPAPER_PWR_VDS_EN | \
+ PIXPAPER_PWR_VSC_EN) /* 0x07: Internal power for VGP/VGN, VSP/VSN, VSPL */
+
+/* Second Parameter */
+#define PIXPAPER_PWR_VGPN_MASK \
+ (3 << 0) /* Bits 1-0: VGPN, VGP/VGN voltage levels */
+#define PIXPAPER_PWR_VGPN_20V (0x0 << 0) /* 00: VGP=20V, VGN=-20V (default) */
+#define PIXPAPER_PWR_VGPN_17V (0x1 << 0) /* 01: VGP=17V, VGN=-17V */
+#define PIXPAPER_PWR_VGPN_15V (0x2 << 0) /* 10: VGP=15V, VGN=-15V */
+#define PIXPAPER_PWR_VGPN_10V (0x3 << 0) /* 11: VGP=10V, VGN=-10V */
+#define PIXPAPER_PWR_CONFIG2 PIXPAPER_PWR_VGPN_20V /* 0x00: VGP=20V, VGN=-20V */
+
+/* Third, Fourth, Sixth Parameters (VSP_1, VSPL_0, VSPL_1) */
+#define PIXPAPER_PWR_VSP_8_2V 0x22 /* VSP_1/VSPL_1: 8.2V (34 decimal) */
+#define PIXPAPER_PWR_VSPL_15V 0x78 /* VSPL_0: 15V (120 decimal) */
+
+/* Fifth Parameter (VSN_1) */
+#define PIXPAPER_PWR_VSN_4V 0x0A /* VSN_1: -4V (10 decimal) */
+
+/* R03H PFS - Power Off Sequence Setting Register */
+/* First Parameter */
+#define PIXPAPER_PFS_T_VDS_OFF_MASK \
+ (3 << 0) /* Bits 1-0: T_VDS_OFF, VSP/VSN power-off sequence */
+#define PIXPAPER_PFS_T_VDS_OFF_20MS (0x0 << 0) /* 00: 20 ms (default) */
+#define PIXPAPER_PFS_T_VDS_OFF_40MS (0x1 << 0) /* 01: 40 ms */
+#define PIXPAPER_PFS_T_VDS_OFF_60MS (0x2 << 0) /* 10: 60 ms */
+#define PIXPAPER_PFS_T_VDS_OFF_80MS (0x3 << 0) /* 11: 80 ms */
+#define PIXPAPER_PFS_T_VDPG_OFF_MASK \
+ (3 << 4) /* Bits 5-4: T_VDPG_OFF, VGP/VGN power-off sequence */
+#define PIXPAPER_PFS_T_VDPG_OFF_20MS (0x0 << 4) /* 00: 20 ms (default) */
+#define PIXPAPER_PFS_T_VDPG_OFF_40MS (0x1 << 4) /* 01: 40 ms */
+#define PIXPAPER_PFS_T_VDPG_OFF_60MS (0x2 << 4) /* 10: 60 ms */
+#define PIXPAPER_PFS_T_VDPG_OFF_80MS (0x3 << 4) /* 11: 80 ms */
+#define PIXPAPER_PFS_CONFIG1 \
+ (PIXPAPER_PFS_T_VDS_OFF_20MS | \
+ PIXPAPER_PFS_T_VDPG_OFF_20MS) /* 0x10: Default 20 ms for VSP/VSN and VGP/VGN */
+
+/* Second Parameter */
+#define PIXPAPER_PFS_VGP_EXT_MASK \
+ (0xF << 0) /* Bits 3-0: VGP_EXT, VGP extension time */
+#define PIXPAPER_PFS_VGP_EXT_0MS (0x0 << 0) /* 0000: 0 ms */
+#define PIXPAPER_PFS_VGP_EXT_500MS (0x1 << 0) /* 0001: 500 ms */
+#define PIXPAPER_PFS_VGP_EXT_1000MS (0x2 << 0) /* 0010: 1000 ms */
+#define PIXPAPER_PFS_VGP_EXT_1500MS (0x3 << 0) /* 0011: 1500 ms */
+#define PIXPAPER_PFS_VGP_EXT_2000MS (0x4 << 0) /* 0100: 2000 ms (default) */
+#define PIXPAPER_PFS_VGP_EXT_2500MS (0x5 << 0) /* 0101: 2500 ms */
+#define PIXPAPER_PFS_VGP_EXT_3000MS (0x6 << 0) /* 0110: 3000 ms */
+#define PIXPAPER_PFS_VGP_EXT_3500MS (0x7 << 0) /* 0111: 3500 ms */
+#define PIXPAPER_PFS_VGP_EXT_4000MS (0x8 << 0) /* 1000: 4000 ms */
+#define PIXPAPER_PFS_VGP_EXT_4500MS (0x9 << 0) /* 1001: 4500 ms */
+#define PIXPAPER_PFS_VGP_EXT_5000MS (0xA << 0) /* 1010: 5000 ms */
+#define PIXPAPER_PFS_VGP_EXT_5500MS (0xB << 0) /* 1011: 5500 ms */
+#define PIXPAPER_PFS_VGP_EXT_6000MS (0xC << 0) /* 1100: 6000 ms */
+#define PIXPAPER_PFS_VGP_EXT_6500MS (0xD << 0) /* 1101: 6500 ms */
+#define PIXPAPER_PFS_VGP_LEN_MASK \
+ (0xF << 4) /* Bits 7-4: VGP_LEN, VGP at 10V during power-off */
+#define PIXPAPER_PFS_VGP_LEN_0MS (0x0 << 4) /* 0000: 0 ms */
+#define PIXPAPER_PFS_VGP_LEN_500MS (0x1 << 4) /* 0001: 500 ms */
+#define PIXPAPER_PFS_VGP_LEN_1000MS (0x2 << 4) /* 0010: 1000 ms */
+#define PIXPAPER_PFS_VGP_LEN_1500MS (0x3 << 4) /* 0011: 1500 ms */
+#define PIXPAPER_PFS_VGP_LEN_2000MS (0x4 << 4) /* 0100: 2000 ms */
+#define PIXPAPER_PFS_VGP_LEN_2500MS (0x5 << 4) /* 0101: 2500 ms (default) */
+#define PIXPAPER_PFS_VGP_LEN_3000MS (0x6 << 4) /* 0110: 3000 ms */
+#define PIXPAPER_PFS_VGP_LEN_3500MS (0x7 << 4) /* 0111: 3500 ms */
+#define PIXPAPER_PFS_VGP_LEN_4000MS (0x8 << 4) /* 1000: 4000 ms */
+#define PIXPAPER_PFS_VGP_LEN_4500MS (0x9 << 4) /* 1001: 4500 ms */
+#define PIXPAPER_PFS_VGP_LEN_5000MS (0xA << 4) /* 1010: 5000 ms */
+#define PIXPAPER_PFS_VGP_LEN_5500MS (0xB << 4) /* 1011: 5500 ms */
+#define PIXPAPER_PFS_VGP_LEN_6000MS (0xC << 4) /* 1100: 6000 ms */
+#define PIXPAPER_PFS_VGP_LEN_6500MS (0xD << 4) /* 1101: 6500 ms */
+#define PIXPAPER_PFS_CONFIG2 \
+ (PIXPAPER_PFS_VGP_EXT_1000MS | \
+ PIXPAPER_PFS_VGP_LEN_2500MS) /* 0x54: VGP extension 1000 ms, VGP at 10V for 2500 ms */
+
+/* Third Parameter */
+#define PIXPAPER_PFS_XON_LEN_MASK \
+ (0xF << 0) /* Bits 3-0: XON_LEN, XON enable time */
+#define PIXPAPER_PFS_XON_LEN_0MS (0x0 << 0) /* 0000: 0 ms */
+#define PIXPAPER_PFS_XON_LEN_500MS (0x1 << 0) /* 0001: 500 ms */
+#define PIXPAPER_PFS_XON_LEN_1000MS (0x2 << 0) /* 0010: 1000 ms */
+#define PIXPAPER_PFS_XON_LEN_1500MS (0x3 << 0) /* 0011: 1500 ms */
+#define PIXPAPER_PFS_XON_LEN_2000MS (0x4 << 0) /* 0100: 2000 ms (default) */
+#define PIXPAPER_PFS_XON_LEN_2500MS (0x5 << 0) /* 0101: 2500 ms */
+#define PIXPAPER_PFS_XON_LEN_3000MS (0x6 << 0) /* 0110: 3000 ms */
+#define PIXPAPER_PFS_XON_LEN_3500MS (0x7 << 0) /* 0111: 3500 ms */
+#define PIXPAPER_PFS_XON_LEN_4000MS (0x8 << 0) /* 1000: 4000 ms */
+#define PIXPAPER_PFS_XON_LEN_4500MS (0x9 << 0) /* 1001: 4500 ms */
+#define PIXPAPER_PFS_XON_LEN_5000MS (0xA << 0) /* 1010: 5000 ms */
+#define PIXPAPER_PFS_XON_LEN_5500MS (0xB << 0) /* 1011: 5500 ms */
+#define PIXPAPER_PFS_XON_LEN_6000MS (0xC << 0) /* 1100: 6000 ms */
+#define PIXPAPER_PFS_XON_DLY_MASK \
+ (0xF << 4) /* Bits 7-4: XON_DLY, XON delay time */
+#define PIXPAPER_PFS_XON_DLY_0MS (0x0 << 4) /* 0000: 0 ms */
+#define PIXPAPER_PFS_XON_DLY_500MS (0x1 << 4) /* 0001: 500 ms */
+#define PIXPAPER_PFS_XON_DLY_1000MS (0x2 << 4) /* 0010: 1000 ms */
+#define PIXPAPER_PFS_XON_DLY_1500MS (0x3 << 4) /* 0011: 1500 ms */
+#define PIXPAPER_PFS_XON_DLY_2000MS (0x4 << 4) /* 0100: 2000 ms (default) */
+#define PIXPAPER_PFS_XON_DLY_2500MS (0x5 << 4) /* 0101: 2500 ms */
+#define PIXPAPER_PFS_XON_DLY_3000MS (0x6 << 4) /* 0110: 3000 ms */
+#define PIXPAPER_PFS_XON_DLY_3500MS (0x7 << 4) /* 0111: 3500 ms */
+#define PIXPAPER_PFS_XON_DLY_4000MS (0x8 << 4) /* 1000: 4000 ms */
+#define PIXPAPER_PFS_XON_DLY_4500MS (0x9 << 4) /* 1001: 4500 ms */
+#define PIXPAPER_PFS_XON_DLY_5000MS (0xA << 4) /* 1010: 5000 ms */
+#define PIXPAPER_PFS_XON_DLY_5500MS (0xB << 4) /* 1011: 5500 ms */
+#define PIXPAPER_PFS_XON_DLY_6000MS (0xC << 4) /* 1100: 6000 ms */
+#define PIXPAPER_PFS_CONFIG3 \
+ (PIXPAPER_PFS_XON_LEN_2000MS | \
+ PIXPAPER_PFS_XON_DLY_2000MS) /* 0x44: XON enable and delay at 2000 ms */
+
+/* R06H BTST - Booster Soft Start Command */
+/* First Parameter */
+#define PIXPAPER_BTST_PHA_SFT_MASK \
+ (3 << 0) /* Bits 1-0: PHA_SFT, soft start period for phase A */
+#define PIXPAPER_BTST_PHA_SFT_10MS (0x0 << 0) /* 00: 10 ms (default) */
+#define PIXPAPER_BTST_PHA_SFT_20MS (0x1 << 0) /* 01: 20 ms */
+#define PIXPAPER_BTST_PHA_SFT_30MS (0x2 << 0) /* 10: 30 ms */
+#define PIXPAPER_BTST_PHA_SFT_40MS (0x3 << 0) /* 11: 40 ms */
+#define PIXPAPER_BTST_PHB_SFT_MASK \
+ (3 << 2) /* Bits 3-2: PHB_SFT, soft start period for phase B */
+#define PIXPAPER_BTST_PHB_SFT_10MS (0x0 << 2) /* 00: 10 ms (default) */
+#define PIXPAPER_BTST_PHB_SFT_20MS (0x1 << 2) /* 01: 20 ms */
+#define PIXPAPER_BTST_PHB_SFT_30MS (0x2 << 2) /* 10: 30 ms */
+#define PIXPAPER_BTST_PHB_SFT_40MS (0x3 << 2) /* 11: 40 ms */
+#define PIXPAPER_BTST_CONFIG1 \
+ (PIXPAPER_BTST_PHA_SFT_40MS | \
+ PIXPAPER_BTST_PHB_SFT_40MS) /* 0x0F: 40 ms for phase A and B */
+
+/* Second to Seventh Parameters (Driving Strength or Minimum OFF Time) */
+#define PIXPAPER_BTST_CONFIG2 0x0A /* Strength11 */
+#define PIXPAPER_BTST_CONFIG3 0x2F /* Period48 */
+#define PIXPAPER_BTST_CONFIG4 0x25 /* Strength38 */
+#define PIXPAPER_BTST_CONFIG5 0x22 /* Period35 */
+#define PIXPAPER_BTST_CONFIG6 0x2E /* Strength47 */
+#define PIXPAPER_BTST_CONFIG7 0x21 /* Period34 */
+
+/* R12H: DRF (Display Refresh) */
+#define PIXPAPER_DRF_VCOM_AC 0x00 /* AC VCOM: VCOM follows LUTC (default) */
+#define PIXPAPER_DRF_VCOM_DC 0x01 /* DC VCOM: VCOM fixed to VCOMDC */
+
+/* R30H PLL - PLL Control Register */
+/* First Parameter */
+#define PIXPAPER_PLL_FR_MASK (0x7 << 0) /* Bits 2-0: FR, frame rate */
+#define PIXPAPER_PLL_FR_12_5HZ (0x0 << 0) /* 000: 12.5 Hz */
+#define PIXPAPER_PLL_FR_25HZ (0x1 << 0) /* 001: 25 Hz */
+#define PIXPAPER_PLL_FR_50HZ (0x2 << 0) /* 010: 50 Hz (default) */
+#define PIXPAPER_PLL_FR_65HZ (0x3 << 0) /* 011: 65 Hz */
+#define PIXPAPER_PLL_FR_75HZ (0x4 << 0) /* 100: 75 Hz */
+#define PIXPAPER_PLL_FR_85HZ (0x5 << 0) /* 101: 85 Hz */
+#define PIXPAPER_PLL_FR_100HZ (0x6 << 0) /* 110: 100 Hz */
+#define PIXPAPER_PLL_FR_120HZ (0x7 << 0) /* 111: 120 Hz */
+#define PIXPAPER_PLL_DFR \
+ (1 << 3) /* Bit 3: Dynamic frame rate, 0=disabled (default), 1=enabled */
+#define PIXPAPER_PLL_CONFIG \
+ (PIXPAPER_PLL_FR_50HZ) /* 0x02: 50 Hz, dynamic frame rate disabled */
+
+/* R41H TSE - Temperature Sensor Calibration Register */
+/* First Parameter */
+#define PIXPAPER_TSE_TO_MASK \
+ (0xF << 0) /* Bits 3-0: TO[3:0], temperature offset */
+#define PIXPAPER_TSE_TO_POS_0C (0x0 << 0) /* 0000: +0°C (default) */
+#define PIXPAPER_TSE_TO_POS_0_5C (0x1 << 0) /* 0001: +0.5°C */
+#define PIXPAPER_TSE_TO_POS_1C (0x2 << 0) /* 0010: +1°C */
+#define PIXPAPER_TSE_TO_POS_1_5C (0x3 << 0) /* 0011: +1.5°C */
+#define PIXPAPER_TSE_TO_POS_2C (0x4 << 0) /* 0100: +2°C */
+#define PIXPAPER_TSE_TO_POS_2_5C (0x5 << 0) /* 0101: +2.5°C */
+#define PIXPAPER_TSE_TO_POS_3C (0x6 << 0) /* 0110: +3°C */
+#define PIXPAPER_TSE_TO_POS_3_5C (0x7 << 0) /* 0111: +3.5°C */
+#define PIXPAPER_TSE_TO_NEG_4C (0x8 << 0) /* 1000: -4°C */
+#define PIXPAPER_TSE_TO_NEG_3_5C (0x9 << 0) /* 1001: -3.5°C */
+#define PIXPAPER_TSE_TO_NEG_3C (0xA << 0) /* 1010: -3°C */
+#define PIXPAPER_TSE_TO_NEG_2_5C (0xB << 0) /* 1011: -2.5°C */
+#define PIXPAPER_TSE_TO_NEG_2C (0xC << 0) /* 1100: -2°C */
+#define PIXPAPER_TSE_TO_NEG_1_5C (0xD << 0) /* 1101: -1.5°C */
+#define PIXPAPER_TSE_TO_NEG_1C (0xE << 0) /* 1110: -1°C */
+#define PIXPAPER_TSE_TO_NEG_0_5C (0xF << 0) /* 1111: -0.5°C */
+#define PIXPAPER_TSE_TO_FINE_MASK \
+ (0x3 << 4) /* Bits 5-4: TO[5:4], fine adjustment for positive offsets */
+#define PIXPAPER_TSE_TO_FINE_0C (0x0 << 4) /* 00: +0.0°C (default) */
+#define PIXPAPER_TSE_TO_FINE_0_25C (0x1 << 4) /* 01: +0.25°C */
+#define PIXPAPER_TSE_ENABLE \
+ (0 << 7) /* Bit 7: TSE, 0=internal sensor enabled (default), 1=disabled (external) */
+#define PIXPAPER_TSE_DISABLE \
+ (1 << 7) /* Bit 7: TSE, 1=internal sensor disabled, use external */
+#define PIXPAPER_TSE_CONFIG \
+ (PIXPAPER_TSE_TO_POS_0C | PIXPAPER_TSE_TO_FINE_0C | \
+ PIXPAPER_TSE_ENABLE) /* 0x00: Internal sensor enabled, +0°C offset */
+
+/* R4DH */
+#define PIXPAPER_UNKNOWN_4D_CONFIG \
+ 0x78 /* This value is essential for initialization, derived from userspace examples. */
+
+/* R50H CDI - VCOM and DATA Interval Setting Register */
+/* First Parameter */
+#define PIXPAPER_CDI_INTERVAL_MASK \
+ (0xF << 0) /* Bits 3-0: CDI[3:0], VCOM and data interval (hsync) */
+#define PIXPAPER_CDI_17_HSYNC (0x0 << 0) /* 0000: 17 hsync */
+#define PIXPAPER_CDI_16_HSYNC (0x1 << 0) /* 0001: 16 hsync */
+#define PIXPAPER_CDI_15_HSYNC (0x2 << 0) /* 0010: 15 hsync */
+#define PIXPAPER_CDI_14_HSYNC (0x3 << 0) /* 0011: 14 hsync */
+#define PIXPAPER_CDI_13_HSYNC (0x4 << 0) /* 0100: 13 hsync */
+#define PIXPAPER_CDI_12_HSYNC (0x5 << 0) /* 0101: 12 hsync */
+#define PIXPAPER_CDI_11_HSYNC (0x6 << 0) /* 0110: 11 hsync */
+#define PIXPAPER_CDI_10_HSYNC (0x7 << 0) /* 0111: 10 hsync (default) */
+#define PIXPAPER_CDI_9_HSYNC (0x8 << 0) /* 1000: 9 hsync */
+#define PIXPAPER_CDI_8_HSYNC (0x9 << 0) /* 1001: 8 hsync */
+#define PIXPAPER_CDI_7_HSYNC (0xA << 0) /* 1010: 7 hsync */
+#define PIXPAPER_CDI_6_HSYNC (0xB << 0) /* 1011: 6 hsync */
+#define PIXPAPER_CDI_5_HSYNC (0xC << 0) /* 1100: 5 hsync */
+#define PIXPAPER_CDI_4_HSYNC (0xD << 0) /* 1101: 4 hsync */
+#define PIXPAPER_CDI_3_HSYNC (0xE << 0) /* 1110: 3 hsync */
+#define PIXPAPER_CDI_2_HSYNC (0xF << 0) /* 1111: 2 hsync */
+#define PIXPAPER_CDI_DDX \
+ (1 << 4) /* Bit 4: DDX, 0=grayscale mapping 0, 1=grayscale mapping 1 (default) */
+#define PIXPAPER_CDI_VBD_MASK \
+ (0x7 << 5) /* Bits 7-5: VBD[2:0], border data selection */
+#define PIXPAPER_CDI_VBD_FLOAT (0x0 << 5) /* 000: Floating (DDX=0 or 1) */
+#define PIXPAPER_CDI_VBD_GRAY3_DDX0 \
+ (0x1 << 5) /* 001: Gray3 (border_buf=011) when DDX=0 */
+#define PIXPAPER_CDI_VBD_GRAY2_DDX0 \
+ (0x2 << 5) /* 010: Gray2 (border_buf=010) when DDX=0 */
+#define PIXPAPER_CDI_VBD_GRAY1_DDX0 \
+ (0x3 << 5) /* 011: Gray1 (border_buf=001) when DDX=0 */
+#define PIXPAPER_CDI_VBD_GRAY0_DDX0 \
+ (0x4 << 5) /* 100: Gray0 (border_buf=000) when DDX=0 */
+#define PIXPAPER_CDI_VBD_GRAY0_DDX1 \
+ (0x0 << 5) /* 000: Gray0 (border_buf=000) when DDX=1 */
+#define PIXPAPER_CDI_VBD_GRAY1_DDX1 \
+ (0x1 << 5) /* 001: Gray1 (border_buf=001) when DDX=1 */
+#define PIXPAPER_CDI_VBD_GRAY2_DDX1 \
+ (0x2 << 5) /* 010: Gray2 (border_buf=010) when DDX=1 */
+#define PIXPAPER_CDI_VBD_GRAY3_DDX1 \
+ (0x3 << 5) /* 011: Gray3 (border_buf=011) when DDX=1 */
+#define PIXPAPER_CDI_VBD_FLOAT_DDX1 (0x4 << 5) /* 100: Floating when DDX=1 */
+#define PIXPAPER_CDI_CONFIG \
+ (PIXPAPER_CDI_10_HSYNC | PIXPAPER_CDI_DDX | \
+ PIXPAPER_CDI_VBD_GRAY1_DDX1) /* 0x37: 10 hsync, DDX=1, border Gray1 */
+
+/* R60H */
+#define PIXPAPER_UNKNOWN_60_CONFIG1 \
+ 0x02 /* This value is essential for initialization, derived from userspace examples. */
+#define PIXPAPER_UNKNOWN_60_CONFIG2 \
+ 0x02 /* This value is essential for initialization, derived from userspace examples. */
+
+/* R61H TRES - Resolution Setting Register */
+#define PIXPAPER_TRES_HRES_H \
+ ((PIXPAPER_PANEL_BUFFER_WIDTH >> 8) & \
+ 0xFF) /* HRES[9:8]: High byte of horizontal resolution (128) */
+#define PIXPAPER_TRES_HRES_L \
+ (PIXPAPER_PANEL_BUFFER_WIDTH & \
+ 0xFF) /* HRES[7:0]: Low byte of horizontal resolution (128 = 0x80) */
+#define PIXPAPER_TRES_VRES_H \
+ ((PIXPAPER_HEIGHT >> 8) & \
+ 0xFF) /* VRES[9:8]: High byte of vertical resolution (250) */
+#define PIXPAPER_TRES_VRES_L \
+ (PIXPAPER_HEIGHT & \
+ 0xFF) /* VRES[7:0]: Low byte of vertical resolution (250 = 0xFA) */
+
+/* R65H GSST - Gate/Source Start Setting Register */
+#define PIXPAPER_GSST_S_START 0x00 /* S_Start[7:0]: First source line (S0) */
+#define PIXPAPER_GSST_RESERVED 0x00 /* Reserved byte */
+#define PIXPAPER_GSST_G_START_H \
+ 0x00 /* G_Start[8]: High bit of first gate line (G0) */
+#define PIXPAPER_GSST_G_START_L \
+ 0x00 /* G_Start[7:0]: Low byte of first gate line (G0) */
+
+/* RB4H */
+#define PIXPAPER_UNKNOWN_B4_CONFIG \
+ 0xD0 /* This value is essential for initialization, derived from userspace examples. */
+
+/* RB5H */
+#define PIXPAPER_UNKNOWN_B5_CONFIG \
+ 0x03 /* This value is essential for initialization, derived from userspace examples. */
+
+/* RE0H */
+#define PIXPAPER_UNKNOWN_E0_CONFIG \
+ 0x00 /* This value is essential for initialization, derived from userspace examples. */
+
+/* RE3H PWS - Power Saving Register */
+/* First Parameter */
+#define PIXPAPER_PWS_VCOM_W_MASK \
+ (0xF \
+ << 4) /* Bits 7-4: VCOM_W[3:0], VCOM power-saving width (line periods) */
+#define PIXPAPER_PWS_VCOM_W_0 (0x0 << 4) /* 0000: 0 line periods */
+#define PIXPAPER_PWS_VCOM_W_1 (0x1 << 4) /* 0001: 1 line period */
+#define PIXPAPER_PWS_VCOM_W_2 (0x2 << 4) /* 0010: 2 line periods */
+#define PIXPAPER_PWS_VCOM_W_3 (0x3 << 4) /* 0011: 3 line periods */
+#define PIXPAPER_PWS_VCOM_W_4 (0x4 << 4) /* 0100: 4 line periods */
+#define PIXPAPER_PWS_VCOM_W_5 (0x5 << 4) /* 0101: 5 line periods */
+#define PIXPAPER_PWS_VCOM_W_6 (0x6 << 4) /* 0110: 6 line periods */
+#define PIXPAPER_PWS_VCOM_W_7 (0x7 << 4) /* 0111: 7 line periods */
+#define PIXPAPER_PWS_VCOM_W_8 (0x8 << 4) /* 1000: 8 line periods */
+#define PIXPAPER_PWS_VCOM_W_9 (0x9 << 4) /* 1001: 9 line periods */
+#define PIXPAPER_PWS_VCOM_W_10 (0xA << 4) /* 1010: 10 line periods */
+#define PIXPAPER_PWS_VCOM_W_11 (0xB << 4) /* 1011: 11 line periods */
+#define PIXPAPER_PWS_VCOM_W_12 (0xC << 4) /* 1100: 12 line periods */
+#define PIXPAPER_PWS_VCOM_W_13 (0xD << 4) /* 1101: 13 line periods */
+#define PIXPAPER_PWS_VCOM_W_14 (0xE << 4) /* 1110: 14 line periods */
+#define PIXPAPER_PWS_VCOM_W_15 (0xF << 4) /* 1111: 15 line periods */
+#define PIXPAPER_PWS_SD_W_MASK \
+ (0xF << 0) /* Bits 3-0: SD_W[3:0], source power-saving width (660 ns units) */
+#define PIXPAPER_PWS_SD_W_0 (0x0 << 0) /* 0000: 0 ns */
+#define PIXPAPER_PWS_SD_W_1 (0x1 << 0) /* 0001: 660 ns */
+#define PIXPAPER_PWS_SD_W_2 (0x2 << 0) /* 0010: 1320 ns */
+#define PIXPAPER_PWS_SD_W_3 (0x3 << 0) /* 0011: 1980 ns */
+#define PIXPAPER_PWS_SD_W_4 (0x4 << 0) /* 0100: 2640 ns */
+#define PIXPAPER_PWS_SD_W_5 (0x5 << 0) /* 0101: 3300 ns */
+#define PIXPAPER_PWS_SD_W_6 (0x6 << 0) /* 0110: 3960 ns */
+#define PIXPAPER_PWS_SD_W_7 (0x7 << 0) /* 0111: 4620 ns */
+#define PIXPAPER_PWS_SD_W_8 (0x8 << 0) /* 1000: 5280 ns */
+#define PIXPAPER_PWS_SD_W_9 (0x9 << 0) /* 1001: 5940 ns */
+#define PIXPAPER_PWS_SD_W_10 (0xA << 0) /* 1010: 6600 ns */
+#define PIXPAPER_PWS_SD_W_11 (0xB << 0) /* 1011: 7260 ns */
+#define PIXPAPER_PWS_SD_W_12 (0xC << 0) /* 1100: 7920 ns */
+#define PIXPAPER_PWS_SD_W_13 (0xD << 0) /* 1101: 8580 ns */
+#define PIXPAPER_PWS_SD_W_14 (0xE << 0) /* 1110: 9240 ns */
+#define PIXPAPER_PWS_SD_W_15 (0xF << 0) /* 1111: 9900 ns */
+#define PIXPAPER_PWS_CONFIG \
+ (PIXPAPER_PWS_VCOM_W_2 | \
+ PIXPAPER_PWS_SD_W_2) /* 0x22: VCOM 2 line periods (160 µs), source 1320 ns */
+
+/* RE7H */
+#define PIXPAPER_UNKNOWN_E7_CONFIG \
+ 0x1C /* This value is essential for initialization, derived from userspace examples. */
+
+/* RE9H */
+#define PIXPAPER_UNKNOWN_E9_CONFIG \
+ 0x01 /* This value is essential for initialization, derived from userspace examples. */
+
+#endif /* __PIXPAPER_REGS_H__ */
diff --git a/drivers/gpu/drm/tiny/pixpaper.c b/drivers/gpu/drm/tiny/pixpaper.c
new file mode 100644
index 0000000000000000000000000000000000000000..15c7b529b59c60e0d2fc1dbea5eac07cd9f8268c
--- /dev/null
+++ b/drivers/gpu/drm/tiny/pixpaper.c
@@ -0,0 +1,790 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DRM driver for PIXPAPER e-ink panel
+ *
+ * Author: LiangCheng Wang <zaq14760@...il.com>,
+ */
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fbdev_shmem.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_probe_helper.h>
+
+#include "pixpaper-regs.h"
+
+MODULE_IMPORT_NS("DMA_BUF");
+
+/*
+ * The panel has a visible resolution of 122x250.
+ * However, the controller requires the horizontal resolution to be aligned to 128 pixels.
+ * No porch or sync timing values are provided in the datasheet, so we define minimal
+ * placeholder values to satisfy the DRM framework.
+ */
+
+/* Panel visible resolution */
+#define PIXPAPER_WIDTH 122
+#define PIXPAPER_HEIGHT 250
+
+/* Controller requires 128 horizontal pixels total (for memory alignment) */
+#define PIXPAPER_HTOTAL 128
+#define PIXPAPER_HFP 2
+#define PIXPAPER_HSYNC 2
+#define PIXPAPER_HBP (PIXPAPER_HTOTAL - PIXPAPER_WIDTH - PIXPAPER_HFP - PIXPAPER_HSYNC)
+
+/*
+ * According to the datasheet, the total vertical blanking must be 55 lines,
+ * regardless of how the vertical back porch is set.
+ * Here we allocate VFP=2, VSYNC=2, and VBP=51 to sum up to 55 lines.
+ * Total vertical lines = 250 (visible) + 55 (blanking) = 305.
+ */
+#define PIXPAPER_VTOTAL (250 + 55)
+#define PIXPAPER_VFP 2
+#define PIXPAPER_VSYNC 2
+#define PIXPAPER_VBP (55 - PIXPAPER_VFP - PIXPAPER_VSYNC)
+
+/*
+ * Pixel clock calculation:
+ * pixel_clock = htotal * vtotal * refresh_rate
+ * = 128 * 305 * 50
+ * = 1,952,000 Hz = 1952 kHz
+ */
+#define PIXPAPER_PIXEL_CLOCK 1952
+
+#define PIXPAPER_WIDTH_MM 24 /* approximate from 23.7046mm */
+#define PIXPAPER_HEIGHT_MM 49 /* approximate from 48.55mm */
+
+#define PIXPAPER_SPI_BITS_PER_WORD 8
+#define PIXPAPER_SPI_SPEED_DEFAULT 1000000
+
+#define PIXPAPER_PANEL_BUFFER_WIDTH 128
+#define PIXPAPER_PANEL_BUFFER_TWO_BYTES_PER_ROW (PIXPAPER_PANEL_BUFFER_WIDTH / 4)
+
+#define PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL 60
+#define PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL 200
+#define PIXPAPER_COLOR_THRESHOLD_YELLOW_MIN_GREEN 180
+
+struct pixpaper_error_ctx {
+ int errno_code;
+};
+
+struct pixpaper_panel {
+ struct drm_device drm;
+ struct drm_plane plane;
+ struct drm_crtc crtc;
+ struct drm_encoder encoder;
+ struct drm_connector connector;
+
+ struct spi_device *spi;
+ struct gpio_desc *reset;
+ struct gpio_desc *busy;
+ struct gpio_desc *dc;
+};
+
+static inline struct pixpaper_panel *to_pixpaper_panel(struct drm_device *drm)
+{
+ return container_of(drm, struct pixpaper_panel, drm);
+}
+
+static void pixpaper_wait_busy(struct pixpaper_panel *panel)
+{
+
+
+ unsigned int timeout_ms = 10000;
+ unsigned long timeout_jiffies = jiffies + msecs_to_jiffies(timeout_ms);
+
+ usleep_range(1000, 1500);
+ while (gpiod_get_value_cansleep(panel->busy) != 1) {
+ if (time_after(jiffies, timeout_jiffies)) {
+ drm_warn(&panel->drm, "Busy wait timed out\n");
+ return;
+ }
+ usleep_range(100, 200);
+ }
+}
+
+static void pixpaper_spi_sync(struct spi_device *spi, struct spi_message *msg,
+ struct pixpaper_error_ctx *err)
+{
+ if (err->errno_code)
+ return;
+
+ int ret = spi_sync(spi, msg);
+
+ if (ret < 0)
+ err->errno_code = ret;
+}
+
+static void pixpaper_send_cmd(struct pixpaper_panel *panel, u8 cmd,
+ struct pixpaper_error_ctx *err)
+{
+ if (err->errno_code)
+ return;
+
+ struct spi_transfer xfer = {
+ .tx_buf = &cmd,
+ .len = 1,
+ };
+ struct spi_message msg;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ gpiod_set_value_cansleep(panel->dc, 0);
+ usleep_range(1, 5);
+ pixpaper_spi_sync(panel->spi, &msg, err);
+}
+
+static void pixpaper_send_data(struct pixpaper_panel *panel, u8 data,
+ struct pixpaper_error_ctx *err)
+{
+ if (err->errno_code)
+ return;
+
+ struct spi_transfer xfer = {
+ .tx_buf = &data,
+ .len = 1,
+ };
+ struct spi_message msg;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ gpiod_set_value_cansleep(panel->dc, 1);
+ usleep_range(1, 5);
+ pixpaper_spi_sync(panel->spi, &msg, err);
+}
+
+static int pixpaper_panel_hw_init(struct pixpaper_panel *panel)
+{
+ struct pixpaper_error_ctx err = { .errno_code = 0 };
+
+ gpiod_set_value_cansleep(panel->reset, 0);
+ msleep(50);
+ gpiod_set_value_cansleep(panel->reset, 1);
+ msleep(50);
+
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_4D, &err);
+ pixpaper_send_data(panel, PIXPAPER_UNKNOWN_4D_CONFIG, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_PANEL_SETTING, &err);
+ pixpaper_send_data(panel, PIXPAPER_PSR_CONFIG, &err);
+ pixpaper_send_data(panel, PIXPAPER_PSR_CONFIG2, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_SETTING, &err);
+ pixpaper_send_data(panel, PIXPAPER_PWR_CONFIG1, &err);
+ pixpaper_send_data(panel, PIXPAPER_PWR_CONFIG2, &err);
+ pixpaper_send_data(panel, PIXPAPER_PWR_VSP_8_2V, &err);
+ pixpaper_send_data(panel, PIXPAPER_PWR_VSPL_15V, &err);
+ pixpaper_send_data(panel, PIXPAPER_PWR_VSN_4V, &err);
+ pixpaper_send_data(panel, PIXPAPER_PWR_VSP_8_2V, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_OFF_SEQUENCE, &err);
+ pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG1, &err);
+ pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG2, &err);
+ pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG3, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_BOOSTER_SOFT_START, &err);
+ pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG1, &err);
+ pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG2, &err);
+ pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG3, &err);
+ pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG4, &err);
+ pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG5, &err);
+ pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG6, &err);
+ pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG7, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_PLL_CONTROL, &err);
+ pixpaper_send_data(panel, PIXPAPER_PLL_CONFIG, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_TEMP_SENSOR_CALIB, &err);
+ pixpaper_send_data(panel, PIXPAPER_TSE_CONFIG, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_VCOM_INTERVAL, &err);
+ pixpaper_send_data(panel, PIXPAPER_CDI_CONFIG, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_60, &err);
+ pixpaper_send_data(panel, PIXPAPER_UNKNOWN_60_CONFIG1, &err);
+ pixpaper_send_data(panel, PIXPAPER_UNKNOWN_60_CONFIG2, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_RESOLUTION_SETTING, &err);
+ pixpaper_send_data(panel, PIXPAPER_TRES_HRES_H, &err);
+ pixpaper_send_data(panel, PIXPAPER_TRES_HRES_L, &err);
+ pixpaper_send_data(panel, PIXPAPER_TRES_VRES_H, &err);
+ pixpaper_send_data(panel, PIXPAPER_TRES_VRES_L, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_GATE_SOURCE_START, &err);
+ pixpaper_send_data(panel, PIXPAPER_GSST_S_START, &err);
+ pixpaper_send_data(panel, PIXPAPER_GSST_RESERVED, &err);
+ pixpaper_send_data(panel, PIXPAPER_GSST_G_START_H, &err);
+ pixpaper_send_data(panel, PIXPAPER_GSST_G_START_L, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E7, &err);
+ pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E7_CONFIG, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_SAVING, &err);
+ pixpaper_send_data(panel, PIXPAPER_PWS_CONFIG, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E0, &err);
+ pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E0_CONFIG, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_B4, &err);
+ pixpaper_send_data(panel, PIXPAPER_UNKNOWN_B4_CONFIG, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_B5, &err);
+ pixpaper_send_data(panel, PIXPAPER_UNKNOWN_B5_CONFIG, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E9, &err);
+ pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E9_CONFIG, &err);
+ if (err.errno_code)
+ goto init_fail;
+ pixpaper_wait_busy(panel);
+
+ return 0;
+
+init_fail:
+ drm_err(&panel->drm, "Hardware initialization failed (err=%d)\n",
+ err.errno_code);
+ return err.errno_code;
+}
+
+/*
+ * Convert framebuffer pixels to 2-bit e-paper format:
+ * 00 - White
+ * 01 - Black
+ * 10 - Yellow
+ * 11 - Red
+ */
+static u8 pack_pixels_to_byte(u32 *src_pixels, int i, int j,
+ struct drm_framebuffer *fb)
+{
+ u8 packed_byte = 0;
+ int k;
+
+ for (k = 0; k < 4; k++) {
+ int current_pixel_x = j * 4 + k;
+ u8 two_bit_val;
+
+ if (current_pixel_x < PIXPAPER_WIDTH) {
+ u32 pixel_offset =
+ (i * (fb->pitches[0] / 4)) + current_pixel_x;
+ u32 pixel = src_pixels[pixel_offset];
+ u32 r = (pixel >> 16) & 0xFF;
+ u32 g = (pixel >> 8) & 0xFF;
+ u32 b = pixel & 0xFF;
+
+ if (r < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL &&
+ g < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL &&
+ b < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL) {
+ two_bit_val = 0b00;
+ } else if (r > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL &&
+ g > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL &&
+ b > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL) {
+ two_bit_val = 0b01;
+ } else if (r > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL &&
+ g < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL &&
+ b < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL) {
+ two_bit_val = 0b11;
+ } else if (r > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL &&
+ g > PIXPAPER_COLOR_THRESHOLD_YELLOW_MIN_GREEN &&
+ b < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL) {
+ two_bit_val = 0b10;
+ } else {
+ two_bit_val = 0b01;
+ }
+ } else {
+ two_bit_val = 0b01;
+ }
+
+ packed_byte |= two_bit_val << ((3 - k) * 2);
+ }
+
+ return packed_byte;
+}
+
+static int pixpaper_plane_helper_atomic_check(struct drm_plane *plane,
+ struct drm_atomic_state *state)
+{
+ struct drm_plane_state *new_plane_state =
+ drm_atomic_get_new_plane_state(state, plane);
+ struct drm_crtc *new_crtc = new_plane_state->crtc;
+ struct drm_crtc_state *new_crtc_state = NULL;
+ int ret;
+
+ if (new_crtc)
+ new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
+
+ ret = drm_atomic_helper_check_plane_state(new_plane_state,
+ new_crtc_state, DRM_PLANE_NO_SCALING,
+ DRM_PLANE_NO_SCALING, false, false);
+ if (ret)
+ return ret;
+ else if (!new_plane_state->visible)
+ return 0;
+
+ return 0;
+}
+
+static int pixpaper_crtc_helper_atomic_check(struct drm_crtc *crtc,
+ struct drm_atomic_state *state)
+{
+ struct drm_crtc_state *crtc_state =
+ drm_atomic_get_new_crtc_state(state, crtc);
+
+ if (!crtc_state->enable)
+ return 0;
+
+ return drm_atomic_helper_check_crtc_primary_plane(crtc_state);
+}
+
+static void pixpaper_crtc_atomic_enable(struct drm_crtc *crtc,
+ struct drm_atomic_state *state)
+{
+ struct pixpaper_panel *panel = to_pixpaper_panel(crtc->dev);
+ struct drm_device *drm = &panel->drm;
+ int idx;
+ struct pixpaper_error_ctx err = { .errno_code = 0 };
+
+ if (!drm_dev_enter(drm, &idx))
+ return;
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_ON, &err);
+ if (err.errno_code) {
+ drm_err(drm, "Failed to send PON command: %d\n",
+ err.errno_code);
+ goto exit_drm_dev;
+ }
+
+ pixpaper_wait_busy(panel);
+
+ drm_dbg(drm, "Panel enabled and powered on\n");
+
+exit_drm_dev:
+ drm_dev_exit(idx);
+}
+
+static void pixpaper_crtc_atomic_disable(struct drm_crtc *crtc,
+ struct drm_atomic_state *state)
+{
+ struct pixpaper_panel *panel = to_pixpaper_panel(crtc->dev);
+ struct drm_device *drm = &panel->drm;
+ struct pixpaper_error_ctx err = { .errno_code = 0 };
+ int idx;
+
+ if (!drm_dev_enter(drm, &idx))
+ return;
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_OFF, &err);
+ if (err.errno_code) {
+ drm_err(drm, "Failed to send POF command: %d\n",
+ err.errno_code);
+ goto exit_drm_dev;
+ }
+ pixpaper_wait_busy(panel);
+
+ drm_dbg(drm, "Panel disabled\n");
+
+exit_drm_dev:
+ drm_dev_exit(idx);
+}
+
+static void pixpaper_plane_atomic_update(struct drm_plane *plane,
+ struct drm_atomic_state *state)
+{
+ struct drm_plane_state *plane_state =
+ drm_atomic_get_new_plane_state(state, plane);
+ struct drm_shadow_plane_state *shadow_plane_state =
+ to_drm_shadow_plane_state(plane_state);
+ struct drm_crtc *crtc = plane_state->crtc;
+ struct pixpaper_panel *panel = to_pixpaper_panel(crtc->dev);
+
+ struct drm_device *drm = &panel->drm;
+ struct drm_framebuffer *fb = plane_state->fb;
+ struct iosys_map map = shadow_plane_state->data[0];
+ void *vaddr = map.vaddr;
+ int i, j, idx;
+ u32 *src_pixels = NULL;
+ struct pixpaper_error_ctx err = { .errno_code = 0 };
+
+ if (!drm_dev_enter(drm, &idx))
+ return;
+
+ drm_dbg(drm, "Starting frame update (phys=%dx%d, buf_w=%d)\n",
+ PIXPAPER_WIDTH, PIXPAPER_HEIGHT, PIXPAPER_PANEL_BUFFER_WIDTH);
+
+ if (!fb || !plane_state->visible) {
+ drm_err(drm,
+ "No framebuffer or plane not visible, skipping update\n");
+ goto update_cleanup;
+ }
+
+ src_pixels = (u32 *)vaddr;
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_DATA_START_TRANSMISSION, &err);
+ if (err.errno_code)
+ goto update_cleanup;
+
+ pixpaper_wait_busy(panel);
+
+ for (i = 0; i < PIXPAPER_HEIGHT; i++) {
+ for (j = 0; j < PIXPAPER_PANEL_BUFFER_TWO_BYTES_PER_ROW; j++) {
+ u8 packed_byte =
+ pack_pixels_to_byte(src_pixels, i, j, fb);
+
+ pixpaper_wait_busy(panel);
+ pixpaper_send_data(panel, packed_byte, &err);
+ }
+ }
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_ON, &err);
+ if (err.errno_code) {
+ drm_err(drm, "Failed to send PON command: %d\n",
+ err.errno_code);
+ goto update_cleanup;
+ }
+ pixpaper_wait_busy(panel);
+
+ pixpaper_send_cmd(panel, PIXPAPER_CMD_DISPLAY_REFRESH, &err);
+ pixpaper_send_data(panel, PIXPAPER_DRF_VCOM_AC, &err);
+ if (err.errno_code) {
+ drm_err(drm, "Failed sending data after DRF: %d\n",
+ err.errno_code);
+ goto update_cleanup;
+ }
+ pixpaper_wait_busy(panel);
+
+update_cleanup:
+ if (err.errno_code && err.errno_code != -ETIMEDOUT)
+ drm_err(drm, "Frame update function failed with error %d\n",
+ err.errno_code);
+
+ drm_dev_exit(idx);
+}
+
+static int pixpaper_connector_get_modes(struct drm_connector *connector)
+{
+ struct drm_display_mode *mode;
+
+ drm_dbg(connector->dev, "CALLED for connector %s (id: %d)\n",
+ connector->name, connector->base.id);
+
+ mode = drm_mode_create(connector->dev);
+ if (!mode) {
+ drm_err(connector->dev,
+ "Failed to create mode for connector %s\n",
+ connector->name);
+ return 0;
+ }
+
+ mode->hdisplay = PIXPAPER_WIDTH;
+ mode->hsync_start = PIXPAPER_WIDTH + PIXPAPER_HFP;
+ mode->hsync_end = mode->hsync_start + PIXPAPER_HSYNC;
+ mode->htotal = PIXPAPER_HTOTAL;
+
+ mode->vdisplay = PIXPAPER_HEIGHT;
+ mode->vsync_start = PIXPAPER_HEIGHT + PIXPAPER_VFP;
+ mode->vsync_end = mode->vsync_start + PIXPAPER_VSYNC;
+ mode->vtotal = PIXPAPER_VTOTAL;
+
+ mode->clock = PIXPAPER_PIXEL_CLOCK;
+
+ mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+ drm_mode_set_name(mode);
+
+ if (drm_mode_validate_size(mode, connector->dev->mode_config.max_width,
+ connector->dev->mode_config.max_height) !=
+ MODE_OK) {
+ drm_warn(connector->dev,
+ "Mode %s (%dx%d) failed size validation against max %dx%d\n",
+ mode->name, mode->hdisplay, mode->vdisplay,
+ connector->dev->mode_config.max_width,
+ connector->dev->mode_config.max_height);
+ drm_mode_destroy(connector->dev, mode);
+ return 0;
+ }
+
+ drm_mode_probed_add(connector, mode);
+ drm_dbg(connector->dev, "Added mode '%s' (%dx%d@%d) to connector %s\n",
+ mode->name, mode->hdisplay, mode->vdisplay,
+ drm_mode_vrefresh(mode), connector->name);
+
+ connector->display_info.width_mm = PIXPAPER_WIDTH_MM;
+ connector->display_info.height_mm = PIXPAPER_HEIGHT_MM;
+
+ return 1;
+}
+
+static const struct drm_plane_funcs pixpaper_plane_funcs = {
+ .update_plane = drm_atomic_helper_update_plane,
+ .disable_plane = drm_atomic_helper_disable_plane,
+ .destroy = drm_plane_cleanup,
+ DRM_GEM_SHADOW_PLANE_FUNCS,
+};
+
+static const struct drm_plane_helper_funcs pixpaper_plane_helper_funcs = {
+ DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
+ .atomic_check = pixpaper_plane_helper_atomic_check,
+ .atomic_update = pixpaper_plane_atomic_update,
+};
+
+static const struct drm_crtc_funcs pixpaper_crtc_funcs = {
+ .set_config = drm_atomic_helper_set_config,
+ .page_flip = drm_atomic_helper_page_flip,
+ .reset = drm_atomic_helper_crtc_reset,
+ .destroy = drm_crtc_cleanup,
+ .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+static const struct drm_crtc_helper_funcs pixpaper_crtc_helper_funcs = {
+ .atomic_check = pixpaper_crtc_helper_atomic_check,
+ .atomic_enable = pixpaper_crtc_atomic_enable,
+ .atomic_disable = pixpaper_crtc_atomic_disable,
+};
+
+static const struct drm_encoder_funcs pixpaper_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
+static const struct drm_connector_funcs pixpaper_connector_funcs = {
+ .reset = drm_atomic_helper_connector_reset,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = drm_connector_cleanup,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static const struct drm_connector_helper_funcs pixpaper_connector_helper_funcs = {
+ .get_modes = pixpaper_connector_get_modes,
+};
+
+DEFINE_DRM_GEM_FOPS(pixpaper_fops);
+
+static struct drm_driver pixpaper_drm_driver = {
+ .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+ .fops = &pixpaper_fops,
+ .name = "pixpaper",
+ .desc = "DRM driver for PIXPAPER e-ink",
+ .major = 1,
+ .minor = 0,
+ DRM_GEM_SHMEM_DRIVER_OPS,
+ DRM_FBDEV_SHMEM_DRIVER_OPS,
+};
+
+static int pixpaper_mode_valid(struct drm_device *dev,
+ const struct drm_display_mode *mode)
+{
+ if (mode->hdisplay == PIXPAPER_WIDTH &&
+ mode->vdisplay == PIXPAPER_HEIGHT) {
+ return MODE_OK;
+ }
+ return MODE_BAD;
+}
+
+static const struct drm_mode_config_funcs pixpaper_mode_config_funcs = {
+ .fb_create = drm_gem_fb_create_with_dirty,
+ .mode_valid = pixpaper_mode_valid,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
+static int pixpaper_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct pixpaper_panel *panel;
+ struct drm_device *drm;
+ int ret;
+
+ panel = devm_drm_dev_alloc(dev, &pixpaper_drm_driver,
+ struct pixpaper_panel, drm);
+ if (IS_ERR(panel))
+ return PTR_ERR(panel);
+
+ drm = &panel->drm;
+ panel->spi = spi;
+ spi_set_drvdata(spi, panel);
+
+ spi->mode = SPI_MODE_0;
+ spi->bits_per_word = PIXPAPER_SPI_BITS_PER_WORD;
+
+ if (!spi->max_speed_hz) {
+ drm_warn(drm,
+ "spi-max-frequency not specified in DT, using default %u Hz\n",
+ PIXPAPER_SPI_SPEED_DEFAULT);
+ spi->max_speed_hz = PIXPAPER_SPI_SPEED_DEFAULT;
+ }
+
+ ret = spi_setup(spi);
+ if (ret < 0) {
+ drm_err(drm, "SPI setup failed: %d\n", ret);
+ return ret;
+ }
+
+ if (!dev->dma_mask)
+ dev->dma_mask = &dev->coherent_dma_mask;
+ ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+ if (ret) {
+ drm_err(drm, "Failed to set DMA mask: %d\n", ret);
+ return ret;
+ }
+
+ panel->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(panel->reset))
+ return PTR_ERR(panel->reset);
+
+ panel->busy = devm_gpiod_get(dev, "busy", GPIOD_IN);
+ if (IS_ERR(panel->busy))
+ return PTR_ERR(panel->busy);
+
+ panel->dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_HIGH);
+ if (IS_ERR(panel->dc))
+ return PTR_ERR(panel->dc);
+
+ ret = pixpaper_panel_hw_init(panel);
+ if (ret) {
+ drm_err(drm, "Panel hardware initialization failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = drmm_mode_config_init(drm);
+ if (ret)
+ return ret;
+ drm->mode_config.funcs = &pixpaper_mode_config_funcs;
+ drm->mode_config.min_width = PIXPAPER_WIDTH;
+ drm->mode_config.max_width = PIXPAPER_WIDTH;
+ drm->mode_config.min_height = PIXPAPER_HEIGHT;
+ drm->mode_config.max_height = PIXPAPER_HEIGHT;
+
+ ret = drm_universal_plane_init(drm, &panel->plane, 1, &pixpaper_plane_funcs,
+ (const uint32_t[]){ DRM_FORMAT_XRGB8888 }, 1, NULL,
+ DRM_PLANE_TYPE_PRIMARY, NULL);
+ if (ret)
+ return ret;
+ drm_plane_helper_add(&panel->plane, &pixpaper_plane_helper_funcs);
+
+ ret = drm_crtc_init_with_planes(drm, &panel->crtc, &panel->plane, NULL,
+ &pixpaper_crtc_funcs, NULL);
+ if (ret)
+ return ret;
+ drm_crtc_helper_add(&panel->crtc, &pixpaper_crtc_helper_funcs);
+
+ ret = drm_encoder_init(drm, &panel->encoder, &pixpaper_encoder_funcs,
+ DRM_MODE_ENCODER_NONE, NULL);
+ if (ret)
+ return ret;
+ panel->encoder.possible_crtcs = drm_crtc_mask(&panel->crtc);
+
+ ret = drm_connector_init(drm, &panel->connector,
+ &pixpaper_connector_funcs,
+ DRM_MODE_CONNECTOR_SPI);
+ if (ret)
+ return ret;
+
+ drm_connector_helper_add(&panel->connector,
+ &pixpaper_connector_helper_funcs);
+ drm_connector_attach_encoder(&panel->connector, &panel->encoder);
+
+ drm_mode_config_reset(drm);
+
+ ret = drm_dev_register(drm, 0);
+ if (ret)
+ return ret;
+
+ drm_client_setup(drm, NULL);
+
+ return 0;
+}
+
+static void pixpaper_remove(struct spi_device *spi)
+{
+ struct pixpaper_panel *panel = spi_get_drvdata(spi);
+
+ if (!panel)
+ return;
+
+ drm_dev_unplug(&panel->drm);
+ drm_atomic_helper_shutdown(&panel->drm);
+}
+
+static const struct spi_device_id pixpaper_ids[] = { { "pixpaper", 0 }, {} };
+MODULE_DEVICE_TABLE(spi, pixpaper_ids);
+
+static const struct of_device_id pixpaper_dt_ids[] = {
+ { .compatible = "mayqueen,pixpaper" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, pixpaper_dt_ids);
+
+static struct spi_driver pixpaper_spi_driver = {
+ .driver = {
+ .name = "pixpaper",
+ .of_match_table = pixpaper_dt_ids,
+ },
+ .id_table = pixpaper_ids,
+ .probe = pixpaper_probe,
+ .remove = pixpaper_remove,
+};
+
+module_spi_driver(pixpaper_spi_driver);
+
+MODULE_AUTHOR("LiangCheng Wang");
+MODULE_DESCRIPTION("DRM SPI driver for PIXPAPER e-ink panel");
+MODULE_LICENSE("GPL");
--
2.34.1
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