Message-ID: <c1b8e395-b384-cce6-16b2-aae3003c3a63@st.com>
Date:   Fri, 23 Feb 2018 08:31:34 +0000
From:   Yannick FERTRE <yannick.fertre@...com>
To:     Philippe CORNU <philippe.cornu@...com>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Andrzej Hajda <a.hajda@...sung.com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Vincent ABRIOU <vincent.abriou@...com>,
        Alexandre TORGUE <alexandre.torgue@...com>
Subject: Re: [PATCH v1 2/2] drm/panel: Add support for Raydium rm68200 panel
 driver

Reviewed-by: Yannick Fertré <yannick.fertre@...com>


On 02/08/2018 03:30 PM, Philippe Cornu wrote:
> This patch adds Raydium Semiconductor Corporation rm68200
> 5.5" 720x1280 TFT LCD panel driver (MIPI-DSI video mode).
>
> Signed-off-by: Philippe Cornu <philippe.cornu@...com>
> ---
>   drivers/gpu/drm/panel/Kconfig                 |   8 +
>   drivers/gpu/drm/panel/Makefile                |   1 +
>   drivers/gpu/drm/panel/panel-raydium-rm68200.c | 464 ++++++++++++++++++++++++++
>   3 files changed, 473 insertions(+)
>   create mode 100755 drivers/gpu/drm/panel/panel-raydium-rm68200.c
>
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 988048ebcc22..08d99dd46765 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -108,6 +108,14 @@ config DRM_PANEL_RASPBERRYPI_TOUCHSCREEN
>   	  Pi 7" Touchscreen.  To compile this driver as a module,
>   	  choose M here.
>   
> +config DRM_PANEL_RAYDIUM_RM68200
> +	tristate "Raydium rm68200 720x1280 dsi 2dl video mode panel"
> +	depends on OF
> +	depends on DRM_MIPI_DSI
> +	help
> +	  Say Y here if you want to enable support for Raydium rm68200
> +	  720x1280 dsi 2dl video mode panel
> +
>   config DRM_PANEL_SAMSUNG_S6E3HA2
>   	tristate "Samsung S6E3HA2 DSI video mode panel"
>   	depends on OF
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 3d2a88d0e965..f26efc11d746 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -9,6 +9,7 @@ obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
>   obj-$(CONFIG_DRM_PANEL_ORISETECH_OTM8009A) += panel-orisetech-otm8009a.o
>   obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o
>   obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen.o
> +obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
> diff --git a/drivers/gpu/drm/panel/panel-raydium-rm68200.c b/drivers/gpu/drm/panel/panel-raydium-rm68200.c
> new file mode 100755
> index 000000000000..f3e15873d05a
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-raydium-rm68200.c
> @@ -0,0 +1,464 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) STMicroelectronics SA 2017
> + *
> + * Authors: Philippe Cornu <philippe.cornu@...com>
> + *          Yannick Fertre <yannick.fertre@...com>
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_panel.h>
> +#include <linux/backlight.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/regulator/consumer.h>
> +#include <video/mipi_display.h>
> +
> +#define DRV_NAME "raydium_rm68200"
> +
> +/*** Manufacturer Command Set ***/
> +#define MCS_CMD_MODE_SW	0xFE /* CMD Mode Switch */
> +#define MCS_CMD1_UCS	0x00 /* User Command Set (UCS = CMD1) */
> +#define MCS_CMD2_P0	0x01 /* Manufacture Command Set Page0 (CMD2 P0) */
> +#define MCS_CMD2_P1	0x02 /* Manufacture Command Set Page1 (CMD2 P1) */
> +#define MCS_CMD2_P2	0x03 /* Manufacture Command Set Page2 (CMD2 P2) */
> +#define MCS_CMD2_P3	0x04 /* Manufacture Command Set Page3 (CMD2 P3) */
> +
> +/* CMD2 P0 commands (Display Options and Power) */
> +#define MCS_STBCTR	0x12 /* TE1 Output Setting Zig-Zag Connection */
> +#define MCS_SGOPCTR	0x16 /* Source Bias Current */
> +#define MCS_SDCTR	0x1A /* Source Output Delay Time */
> +#define MCS_INVCTR	0x1B /* Inversion Type */
> +#define MCS_EXT_PWR_IC	0x24 /* External PWR IC Control */
> +#define MCS_SETAVDD	0x27 /* PFM Control for AVDD Output */
> +#define MCS_SETAVEE	0x29 /* PFM Control for AVEE Output */
> +#define MCS_BT2CTR	0x2B /* DDVDL Charge Pump Control */
> +#define MCS_BT3CTR	0x2F /* VGH Charge Pump Control */
> +#define MCS_BT4CTR	0x34 /* VGL Charge Pump Control */
> +#define MCS_VCMCTR	0x46 /* VCOM Output Level Control */
> +#define MCS_SETVGN	0x52 /* VG M/S N Control */
> +#define MCS_SETVGP	0x54 /* VG M/S P Control */
> +#define MCS_SW_CTRL	0x5F /* Interface Control for PFM and MIPI */
> +
> +/* CMD2 P2 commands (GOA Timing Control) - no description in datasheet */
> +#define GOA_VSTV1	0x00
> +#define GOA_VSTV2	0x07
> +#define GOA_VCLK1	0x0E
> +#define GOA_VCLK2	0x17
> +#define GOA_VCLK_OPT1	0x20
> +#define GOA_BICLK1	0x2A
> +#define GOA_BICLK2	0x37
> +#define GOA_BICLK3	0x44
> +#define GOA_BICLK4	0x4F
> +#define GOA_BICLK_OPT1	0x5B
> +#define GOA_BICLK_OPT2	0x60
> +#define MCS_GOA_GPO1	0x6D
> +#define MCS_GOA_GPO2	0x71
> +#define MCS_GOA_EQ	0x74
> +#define MCS_GOA_CLK_GALLON 0x7C
> +#define MCS_GOA_FS_SEL0	0x7E
> +#define MCS_GOA_FS_SEL1	0x87
> +#define MCS_GOA_FS_SEL2	0x91
> +#define MCS_GOA_FS_SEL3	0x9B
> +#define MCS_GOA_BS_SEL0	0xAC
> +#define MCS_GOA_BS_SEL1	0xB5
> +#define MCS_GOA_BS_SEL2	0xBF
> +#define MCS_GOA_BS_SEL3	0xC9
> +#define MCS_GOA_BS_SEL4	0xD3
> +
> +/* CMD2 P3 commands (Gamma) */
> +#define MCS_GAMMA_VP	0x60 /* Gamma VP1~VP16 */
> +#define MCS_GAMMA_VN	0x70 /* Gamma VN1~VN16 */
> +
> +struct rm68200 {
> +	struct device *dev;
> +	struct drm_panel panel;
> +	struct gpio_desc *reset_gpio;
> +	struct regulator *supply;
> +	struct backlight_device *bl_dev;
> +	bool prepared;
> +	bool enabled;
> +};
> +
> +static const struct drm_display_mode default_mode = {
> +	.clock = 52582,
> +	.hdisplay = 720,
> +	.hsync_start = 720 + 38,
> +	.hsync_end = 720 + 38 + 8,
> +	.htotal = 720 + 38 + 8 + 38,
> +	.vdisplay = 1280,
> +	.vsync_start = 1280 + 12,
> +	.vsync_end = 1280 + 12 + 4,
> +	.vtotal = 1280 + 12 + 4 + 12,
> +	.vrefresh = 50,
> +	.flags = 0,
> +	.width_mm = 68,
> +	.height_mm = 122,
> +};
> +
> +static inline struct rm68200 *panel_to_rm68200(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct rm68200, panel);
> +}
> +
> +static void rm68200_dcs_write_buf(struct rm68200 *ctx, const void *data,
> +				  size_t len)
> +{
> +	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> +
> +	if (mipi_dsi_dcs_write_buffer(dsi, data, len) < 0)
> +		DRM_WARN("mipi dsi dcs write buffer failed\n");
> +}
> +
> +static void rm68200_dcs_write_cmd(struct rm68200 *ctx, u8 cmd, u8 value)
> +{
> +	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> +
> +	if (mipi_dsi_dcs_write(dsi, cmd, &value, 1) < 0)
> +		DRM_WARN("mipi dsi dcs write failed\n");
> +}
> +
> +#define dcs_write_seq(ctx, seq...)				\
> +({								\
> +	static const u8 d[] = { seq };				\
> +	rm68200_dcs_write_buf(ctx, d, ARRAY_SIZE(d));		\
> +})
> +
> +/*
> + * This panel is not able to auto-increment all cmd addresses so for some of
> + * them, we need to send them one by one...
> + */
> +#define dcs_write_cmd_seq(ctx, cmd, seq...)			\
> +({								\
> +	static const u8 d[] = { seq };				\
> +	static int i;						\
> +	for (i = 0; i < ARRAY_SIZE(d) ; i++)			\
> +		rm68200_dcs_write_cmd(ctx, cmd + i, d[i]);	\
> +})
> +
> +static void rm68200_init_sequence(struct rm68200 *ctx)
> +{
> +	/* Enter CMD2 with page 0 */
> +	dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD2_P0);
> +	dcs_write_cmd_seq(ctx, MCS_EXT_PWR_IC, 0xC0, 0x53, 0x00);
> +	dcs_write_seq(ctx, MCS_BT2CTR, 0xE5);
> +	dcs_write_seq(ctx, MCS_SETAVDD, 0x0A);
> +	dcs_write_seq(ctx, MCS_SETAVEE, 0x0A);
> +	dcs_write_seq(ctx, MCS_SGOPCTR, 0x52);
> +	dcs_write_seq(ctx, MCS_BT3CTR, 0x53);
> +	dcs_write_seq(ctx, MCS_BT4CTR, 0x5A);
> +	dcs_write_seq(ctx, MCS_INVCTR, 0x00);
> +	dcs_write_seq(ctx, MCS_STBCTR, 0x0A);
> +	dcs_write_seq(ctx, MCS_SDCTR, 0x06);
> +	dcs_write_seq(ctx, MCS_VCMCTR, 0x56);
> +	dcs_write_seq(ctx, MCS_SETVGN, 0xA0, 0x00);
> +	dcs_write_seq(ctx, MCS_SETVGP, 0xA0, 0x00);
> +	dcs_write_seq(ctx, MCS_SW_CTRL, 0x11); /* 2 data lanes, see doc */
> +
> +	dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD2_P2);
> +	dcs_write_seq(ctx, GOA_VSTV1, 0x05);
> +	dcs_write_seq(ctx, 0x02, 0x0B);
> +	dcs_write_seq(ctx, 0x03, 0x0F);
> +	dcs_write_seq(ctx, 0x04, 0x7D, 0x00, 0x50);
> +	dcs_write_cmd_seq(ctx, GOA_VSTV2, 0x05, 0x16, 0x0D, 0x11, 0x7D, 0x00,
> +			  0x50);
> +	dcs_write_cmd_seq(ctx, GOA_VCLK1, 0x07, 0x08, 0x01, 0x02, 0x00, 0x7D,
> +			  0x00, 0x85, 0x08);
> +	dcs_write_cmd_seq(ctx, GOA_VCLK2, 0x03, 0x04, 0x05, 0x06, 0x00, 0x7D,
> +			  0x00, 0x85, 0x08);
> +	dcs_write_seq(ctx, GOA_VCLK_OPT1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> +		      0x00, 0x00, 0x00, 0x00);
> +	dcs_write_cmd_seq(ctx, GOA_BICLK1, 0x07, 0x08);
> +	dcs_write_seq(ctx, 0x2D, 0x01);
> +	dcs_write_seq(ctx, 0x2F, 0x02, 0x00, 0x40, 0x05, 0x08, 0x54, 0x7D,
> +		      0x00);
> +	dcs_write_cmd_seq(ctx, GOA_BICLK2, 0x03, 0x04, 0x05, 0x06, 0x00);
> +	dcs_write_seq(ctx, 0x3D, 0x40);
> +	dcs_write_seq(ctx, 0x3F, 0x05, 0x08, 0x54, 0x7D, 0x00);
> +	dcs_write_seq(ctx, GOA_BICLK3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> +		      0x00, 0x00, 0x00, 0x00, 0x00);
> +	dcs_write_seq(ctx, GOA_BICLK4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> +		      0x00, 0x00);
> +	dcs_write_seq(ctx, 0x58, 0x00, 0x00, 0x00);
> +	dcs_write_seq(ctx, GOA_BICLK_OPT1, 0x00, 0x00, 0x00, 0x00, 0x00);
> +	dcs_write_seq(ctx, GOA_BICLK_OPT2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> +		      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
> +	dcs_write_seq(ctx, MCS_GOA_GPO1, 0x00, 0x00, 0x00, 0x00);
> +	dcs_write_seq(ctx, MCS_GOA_GPO2, 0x00, 0x20, 0x00);
> +	dcs_write_seq(ctx, MCS_GOA_EQ, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
> +		      0x00, 0x00);
> +	dcs_write_seq(ctx, MCS_GOA_CLK_GALLON, 0x00, 0x00);
> +	dcs_write_cmd_seq(ctx, MCS_GOA_FS_SEL0, 0xBF, 0x02, 0x06, 0x14, 0x10,
> +			  0x16, 0x12, 0x08, 0x3F);
> +	dcs_write_cmd_seq(ctx, MCS_GOA_FS_SEL1, 0x3F, 0x3F, 0x3F, 0x3F, 0x0C,
> +			  0x0A, 0x0E, 0x3F, 0x3F, 0x00);
> +	dcs_write_cmd_seq(ctx, MCS_GOA_FS_SEL2, 0x04, 0x3F, 0x3F, 0x3F, 0x3F,
> +			  0x05, 0x01, 0x3F, 0x3F, 0x0F);
> +	dcs_write_cmd_seq(ctx, MCS_GOA_FS_SEL3, 0x0B, 0x0D, 0x3F, 0x3F, 0x3F,
> +			  0x3F);
> +	dcs_write_cmd_seq(ctx, 0xA2, 0x3F, 0x09, 0x13, 0x17, 0x11, 0x15);
> +	dcs_write_cmd_seq(ctx, 0xA9, 0x07, 0x03, 0x3F);
> +	dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL0, 0x3F, 0x05, 0x01, 0x17, 0x13,
> +			  0x15, 0x11, 0x0F, 0x3F);
> +	dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL1, 0x3F, 0x3F, 0x3F, 0x3F, 0x0B,
> +			  0x0D, 0x09, 0x3F, 0x3F, 0x07);
> +	dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL2, 0x03, 0x3F, 0x3F, 0x3F, 0x3F,
> +			  0x02, 0x06, 0x3F, 0x3F, 0x08);
> +	dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL3, 0x0C, 0x0A, 0x3F, 0x3F, 0x3F,
> +			  0x3F, 0x3F, 0x0E, 0x10, 0x14);
> +	dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL4, 0x12, 0x16, 0x00, 0x04, 0x3F);
> +	dcs_write_seq(ctx, 0xDC, 0x02);
> +	dcs_write_seq(ctx, 0xDE, 0x12);
> +
> +	dcs_write_seq(ctx, MCS_CMD_MODE_SW, 0x0E); /* No documentation */
> +	dcs_write_seq(ctx, 0x01, 0x75);
> +
> +	dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD2_P3);
> +	dcs_write_cmd_seq(ctx, MCS_GAMMA_VP, 0x00, 0x0C, 0x12, 0x0E, 0x06,
> +			  0x12, 0x0E, 0x0B, 0x15, 0x0B, 0x10, 0x07, 0x0F,
> +			  0x12, 0x0C, 0x00);
> +	dcs_write_cmd_seq(ctx, MCS_GAMMA_VN, 0x00, 0x0C, 0x12, 0x0E, 0x06,
> +			  0x12, 0x0E, 0x0B, 0x15, 0x0B, 0x10, 0x07, 0x0F,
> +			  0x12, 0x0C, 0x00);
> +
> +	/* Exit CMD2 */
> +	dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD1_UCS);
> +}
> +
> +static int rm68200_disable(struct drm_panel *panel)
> +{
> +	struct rm68200 *ctx = panel_to_rm68200(panel);
> +
> +	if (!ctx->enabled)
> +		return 0;
> +
> +	if (ctx->bl_dev) {
> +		ctx->bl_dev->props.power = FB_BLANK_POWERDOWN;
> +		ctx->bl_dev->props.state |= BL_CORE_FBBLANK;
> +		backlight_update_status(ctx->bl_dev);
> +	}
> +
> +	ctx->enabled = false;
> +
> +	return 0;
> +}
> +
> +static int rm68200_unprepare(struct drm_panel *panel)
> +{
> +	struct rm68200 *ctx = panel_to_rm68200(panel);
> +	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> +	int ret;
> +
> +	if (!ctx->prepared)
> +		return 0;
> +
> +	ret = mipi_dsi_dcs_set_display_off(dsi);
> +	if (ret)
> +		DRM_WARN("failed to set display off: %d\n", ret);
> +
> +	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
> +	if (ret)
> +		DRM_WARN("failed to enter sleep mode: %d\n", ret);
> +
> +	msleep(120);
> +
> +	if (ctx->reset_gpio) {
> +		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +		msleep(20);
> +	}
> +
> +	regulator_disable(ctx->supply);
> +
> +	ctx->prepared = false;
> +
> +	return 0;
> +}
> +
> +static int rm68200_prepare(struct drm_panel *panel)
> +{
> +	struct rm68200 *ctx = panel_to_rm68200(panel);
> +	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> +	int ret;
> +
> +	if (ctx->prepared)
> +		return 0;
> +
> +	ret = regulator_enable(ctx->supply);
> +	if (ret < 0) {
> +		DRM_ERROR("failed to enable supply: %d\n", ret);
> +		return ret;
> +	}
> +
> +	if (ctx->reset_gpio) {
> +		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +		msleep(20);
> +		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +		msleep(100);
> +	}
> +
> +	rm68200_init_sequence(ctx);
> +
> +	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> +	if (ret)
> +		return ret;
> +
> +	msleep(125);
> +
> +	ret = mipi_dsi_dcs_set_display_on(dsi);
> +	if (ret)
> +		return ret;
> +
> +	msleep(20);
> +
> +	ctx->prepared = true;
> +
> +	return 0;
> +}
> +
> +static int rm68200_enable(struct drm_panel *panel)
> +{
> +	struct rm68200 *ctx = panel_to_rm68200(panel);
> +
> +	if (ctx->enabled)
> +		return 0;
> +
> +	if (ctx->bl_dev) {
> +		ctx->bl_dev->props.state &= ~BL_CORE_FBBLANK;
> +		ctx->bl_dev->props.power = FB_BLANK_UNBLANK;
> +		backlight_update_status(ctx->bl_dev);
> +	}
> +
> +	ctx->enabled = true;
> +
> +	return 0;
> +}
> +
> +static int rm68200_get_modes(struct drm_panel *panel)
> +{
> +	struct drm_display_mode *mode;
> +
> +	mode = drm_mode_duplicate(panel->drm, &default_mode);
> +	if (!mode) {
> +		DRM_ERROR("failed to add mode %ux%ux@%u\n",
> +			  default_mode.hdisplay, default_mode.vdisplay,
> +			  default_mode.vrefresh);
> +		return -ENOMEM;
> +	}
> +
> +	drm_mode_set_name(mode);
> +
> +	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> +	drm_mode_probed_add(panel->connector, mode);
> +
> +	panel->connector->display_info.width_mm = mode->width_mm;
> +	panel->connector->display_info.height_mm = mode->height_mm;
> +
> +	return 1;
> +}
> +
> +static const struct drm_panel_funcs rm68200_drm_funcs = {
> +	.disable   = rm68200_disable,
> +	.unprepare = rm68200_unprepare,
> +	.prepare   = rm68200_prepare,
> +	.enable    = rm68200_enable,
> +	.get_modes = rm68200_get_modes,
> +};
> +
> +static int rm68200_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	struct device_node *backlight;
> +	struct rm68200 *ctx;
> +	int ret;
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(ctx->reset_gpio)) {
> +		dev_err(dev, "cannot get reset-gpio\n");
> +		return PTR_ERR(ctx->reset_gpio);
> +	}
> +
> +	ctx->supply = devm_regulator_get(dev, "power");
> +	if (IS_ERR(ctx->supply)) {
> +		dev_err(dev, "cannot get regulator\n");
> +		return PTR_ERR(ctx->supply);
> +	}
> +
> +	backlight = of_parse_phandle(dev->of_node, "backlight", 0);
> +	if (backlight) {
> +		ctx->bl_dev = of_find_backlight_by_node(backlight);
> +		of_node_put(backlight);
> +
> +		if (!ctx->bl_dev)
> +			return -EPROBE_DEFER;
> +	}
> +
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +
> +	ctx->dev = dev;
> +
> +	dsi->lanes = 2;
> +	dsi->format = MIPI_DSI_FMT_RGB888;
> +	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
> +			  MIPI_DSI_MODE_LPM;
> +
> +	drm_panel_init(&ctx->panel);
> +	ctx->panel.dev = dev;
> +	ctx->panel.funcs = &rm68200_drm_funcs;
> +
> +	drm_panel_add(&ctx->panel);
> +
> +	ret = mipi_dsi_attach(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "mipi_dsi_attach failed. Is host ready?\n");
> +		drm_panel_remove(&ctx->panel);
> +		if (ctx->bl_dev)
> +			put_device(&ctx->bl_dev->dev);
> +		return ret;
> +	}
> +
> +	DRM_INFO(DRV_NAME "_panel %ux%u@%u %ubpp dsi %udl - ready\n",
> +		 default_mode.hdisplay, default_mode.vdisplay,
> +		 default_mode.vrefresh,
> +		 mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
> +
> +	return 0;
> +}
> +
> +static int rm68200_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct rm68200 *ctx = mipi_dsi_get_drvdata(dsi);
> +
> +	if (ctx->bl_dev)
> +		put_device(&ctx->bl_dev->dev);
> +
> +	mipi_dsi_detach(dsi);
> +	drm_panel_remove(&ctx->panel);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id raydium_rm68200_of_match[] = {
> +	{ .compatible = "raydium,rm68200" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, raydium_rm68200_of_match);
> +
> +static struct mipi_dsi_driver raydium_rm68200_driver = {
> +	.probe  = rm68200_probe,
> +	.remove = rm68200_remove,
> +	.driver = {
> +		.name = DRV_NAME "_panel",
> +		.of_match_table = raydium_rm68200_of_match,
> +	},
> +};
> +module_mipi_dsi_driver(raydium_rm68200_driver);
> +
> +MODULE_AUTHOR("Philippe Cornu <philippe.cornu@...com>");
> +MODULE_AUTHOR("Yannick Fertre <yannick.fertre@...com>");
> +MODULE_DESCRIPTION("DRM Driver for Raydium RM68200 MIPI DSI panel");
> +MODULE_LICENSE("GPL v2");

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