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Message-ID: <20240804061503.881283-5-kikuchan98@gmail.com>
Date: Sun, 4 Aug 2024 15:14:48 +0900
From: Hironori KIKUCHI <kikuchan98@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Hironori KIKUCHI <kikuchan98@...il.com>,
Jagan Teki <jagan@...rulasolutions.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Jessica Zhang <quic_jesszhan@...cinc.com>,
Sam Ravnborg <sam@...nborg.org>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
dri-devel@...ts.freedesktop.org,
devicetree@...r.kernel.org
Subject: [PATCH v4 4/5] drm/panel: st7701: Add support for SPI for configuration
The ST7701 supports not only MIPI DSI, but also SPI as an interface
for configuration. To support a panel connected via SPI with an RGB
parallel interface, add support for SPI using MIPI DBI helpers.
Signed-off-by: Hironori KIKUCHI <kikuchan98@...il.com>
Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
---
drivers/gpu/drm/panel/Kconfig | 3 +-
drivers/gpu/drm/panel/panel-sitronix-st7701.c | 123 +++++++++++++++---
2 files changed, 110 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 9f49b0189d3..5d83ddc06ec 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -784,7 +784,8 @@ config DRM_PANEL_SHARP_LS060T1SX01
config DRM_PANEL_SITRONIX_ST7701
tristate "Sitronix ST7701 panel driver"
depends on OF
- depends on DRM_MIPI_DSI
+ depends on SPI || DRM_MIPI_DSI
+ select DRM_MIPI_DBI if SPI
depends on BACKLIGHT_CLASS_DEVICE
help
Say Y here if you want to enable support for the Sitronix
diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7701.c b/drivers/gpu/drm/panel/panel-sitronix-st7701.c
index a0644f7a4c8..9e83a760a8a 100644
--- a/drivers/gpu/drm/panel/panel-sitronix-st7701.c
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7701.c
@@ -4,6 +4,7 @@
* Author: Jagan Teki <jagan@...rulasolutions.com>
*/
+#include <drm/drm_mipi_dbi.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
@@ -14,6 +15,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
#include <video/mipi_display.h>
@@ -130,12 +132,16 @@ struct st7701_panel_desc {
struct st7701 {
struct drm_panel panel;
struct mipi_dsi_device *dsi;
+ struct mipi_dbi dbi;
const struct st7701_panel_desc *desc;
struct regulator_bulk_data supplies[2];
struct gpio_desc *reset;
unsigned int sleep_delay;
enum drm_panel_orientation orientation;
+
+ int (*write_command)(struct st7701 *st7701, u8 cmd, const u8 *seq,
+ size_t len);
};
static inline struct st7701 *panel_to_st7701(struct drm_panel *panel)
@@ -143,16 +149,22 @@ static inline struct st7701 *panel_to_st7701(struct drm_panel *panel)
return container_of(panel, struct st7701, panel);
}
-static inline int st7701_dsi_write(struct st7701 *st7701, const void *seq,
- size_t len)
+static int st7701_dsi_write(struct st7701 *st7701, u8 cmd, const u8 *seq,
+ size_t len)
{
- return mipi_dsi_dcs_write_buffer(st7701->dsi, seq, len);
+ return mipi_dsi_dcs_write(st7701->dsi, cmd, seq, len);
}
-#define ST7701_WRITE(st7701, seq...) \
- { \
- const u8 d[] = { seq }; \
- st7701_dsi_write(st7701, d, ARRAY_SIZE(d)); \
+static int st7701_dbi_write(struct st7701 *st7701, u8 cmd, const u8 *seq,
+ size_t len)
+{
+ return mipi_dbi_command_stackbuf(&st7701->dbi, cmd, seq, len);
+}
+
+#define ST7701_WRITE(st7701, cmd, seq...) \
+ { \
+ const u8 d[] = { seq }; \
+ st7701->write_command(st7701, cmd, d, ARRAY_SIZE(d)); \
}
static u8 st7701_vgls_map(struct st7701 *st7701)
@@ -211,10 +223,10 @@ static void st7701_init_sequence(struct st7701 *st7701)
/* Command2, BK0 */
st7701_switch_cmd_bkx(st7701, true, 0);
- mipi_dsi_dcs_write(st7701->dsi, ST7701_CMD2_BK0_PVGAMCTRL,
- desc->pv_gamma, ARRAY_SIZE(desc->pv_gamma));
- mipi_dsi_dcs_write(st7701->dsi, ST7701_CMD2_BK0_NVGAMCTRL,
- desc->nv_gamma, ARRAY_SIZE(desc->nv_gamma));
+ st7701->write_command(st7701, ST7701_CMD2_BK0_PVGAMCTRL, desc->pv_gamma,
+ ARRAY_SIZE(desc->pv_gamma));
+ st7701->write_command(st7701, ST7701_CMD2_BK0_NVGAMCTRL, desc->nv_gamma,
+ ARRAY_SIZE(desc->nv_gamma));
/*
* Vertical line count configuration:
* Line[6:0]: select number of vertical lines of the TFT matrix in
@@ -1051,6 +1063,10 @@ static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
st7701 = dev_get_drvdata(&dsi->dev);
st7701->dsi = dsi;
+ st7701->write_command = st7701_dsi_write;
+
+ if (!st7701->desc->lanes)
+ return dev_err_probe(&dsi->dev, -EINVAL, "This panel is not for MIPI DSI\n");
dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS;
@@ -1064,30 +1080,107 @@ static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
return 0;
}
+static int st7701_spi_probe(struct spi_device *spi)
+{
+ struct st7701 *st7701;
+ struct gpio_desc *dc;
+ int err;
+
+ err = st7701_probe(&spi->dev, DRM_MODE_CONNECTOR_DPI);
+ if (err)
+ return err;
+
+ st7701 = dev_get_drvdata(&spi->dev);
+ st7701->write_command = st7701_dbi_write;
+
+ dc = devm_gpiod_get_optional(&spi->dev, "dc", GPIOD_OUT_LOW);
+ if (IS_ERR(dc))
+ return dev_err_probe(&spi->dev, PTR_ERR(dc), "Failed to get GPIO for D/CX\n");
+
+ err = mipi_dbi_spi_init(spi, &st7701->dbi, dc);
+ if (err)
+ return dev_err_probe(&spi->dev, err, "Failed to init MIPI DBI\n");
+ st7701->dbi.read_commands = NULL;
+
+ return 0;
+}
+
static void st7701_dsi_remove(struct mipi_dsi_device *dsi)
{
mipi_dsi_detach(dsi);
}
-static const struct of_device_id st7701_of_match[] = {
+static const struct of_device_id st7701_dsi_of_match[] = {
{ .compatible = "anbernic,rg-arc-panel", .data = &rg_arc_desc },
{ .compatible = "densitron,dmt028vghmcmi-1a", .data = &dmt028vghmcmi_1a_desc },
{ .compatible = "elida,kd50t048a", .data = &kd50t048a_desc },
{ .compatible = "techstar,ts8550b", .data = &ts8550b_desc },
{ }
};
-MODULE_DEVICE_TABLE(of, st7701_of_match);
+MODULE_DEVICE_TABLE(of, st7701_dsi_of_match);
+
+static const struct of_device_id st7701_spi_of_match[] = {
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, st7701_spi_of_match);
+
+static const struct spi_device_id st7701_spi_ids[] = {
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(spi, st7701_spi_ids);
static struct mipi_dsi_driver st7701_dsi_driver = {
.probe = st7701_dsi_probe,
.remove = st7701_dsi_remove,
.driver = {
.name = "st7701",
- .of_match_table = st7701_of_match,
+ .of_match_table = st7701_dsi_of_match,
},
};
-module_mipi_dsi_driver(st7701_dsi_driver);
+
+static struct spi_driver st7701_spi_driver = {
+ .probe = st7701_spi_probe,
+ .id_table = st7701_spi_ids,
+ .driver = {
+ .name = "st7701",
+ .of_match_table = st7701_spi_of_match,
+ },
+};
+
+static int __init st7701_driver_init(void)
+{
+ int err;
+
+ if (IS_ENABLED(CONFIG_SPI)) {
+ err = spi_register_driver(&st7701_spi_driver);
+ if (err)
+ return err;
+ }
+
+ if (IS_ENABLED(CONFIG_DRM_MIPI_DSI)) {
+ err = mipi_dsi_driver_register(&st7701_dsi_driver);
+ if (err) {
+ if (IS_ENABLED(CONFIG_SPI))
+ spi_unregister_driver(&st7701_spi_driver);
+ return err;
+ }
+ }
+
+ return 0;
+}
+module_init(st7701_driver_init);
+
+static void __exit st7701_driver_exit(void)
+{
+ if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
+ mipi_dsi_driver_unregister(&st7701_dsi_driver);
+
+ if (IS_ENABLED(CONFIG_SPI))
+ spi_unregister_driver(&st7701_spi_driver);
+}
+module_exit(st7701_driver_exit);
MODULE_AUTHOR("Jagan Teki <jagan@...rulasolutions.com>");
+MODULE_AUTHOR("Hironori KIKUCHI <kikuchan98@...il.com>");
MODULE_DESCRIPTION("Sitronix ST7701 LCD Panel Driver");
MODULE_LICENSE("GPL");
--
2.45.2
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