From 6810bb390282bb75801832f31d088236503fee89 Mon Sep 17 00:00:00 2001
From: Artur Weber <aweber.kernel@gmail.com>
Date: Fri, 19 May 2023 19:03:53 +0200
Subject: [PATCH] drm/panel: Add Samsung S6D7AA0 panel controller driver

Initial driver for S6D7AA0-controlled panels. Currently, the following
panels are supported:

 - S6D7AA0-LSL080AL02 (Samsung Galaxy Tab 3 8.0)
 - S6D7AA0-LSL080AL03 (Samsung Galaxy Tab A 8.0 2015)
 - S6D7AA0-LTL101AT01 (Samsung Galaxy Tab A 9.7 2015)

It should be possible to extend this driver to work with other panels
using this IC.

Tested-by: Nikita Travkin <nikita@trvn.ru> #ltl101at01
Signed-off-by: Artur Weber <aweber.kernel@gmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230519170354.29610-3-aweber.kernel@gmail.com
---
 drivers/gpu/drm/panel/Kconfig                 |   7 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c | 585 ++++++++++++++++++++++++++
 3 files changed, 593 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 2b9d6db..203c0ef 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -553,6 +553,13 @@ config DRM_PANEL_SAMSUNG_S6D27A1
 	  This panel can be found in Samsung Galaxy Ace 2
 	  GT-I8160 mobile phone.
 
+config DRM_PANEL_SAMSUNG_S6D7AA0
+	tristate "Samsung S6D7AA0 MIPI-DSI video mode panel controller"
+	depends on OF
+	depends on BACKLIGHT_CLASS_DEVICE
+	select DRM_MIPI_DSI
+	select VIDEOMODE_HELPERS
+
 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 ff16978..30cf553 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D27A1) += panel-samsung-s6d27a1.o
+obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D7AA0) += panel-samsung-s6d7aa0.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0) += panel-samsung-s6e63m0.o
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c b/drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c
new file mode 100644
index 0000000..f532aa0
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c
@@ -0,0 +1,585 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Samsung S6D7AA0 MIPI-DSI TFT LCD controller drm_panel driver.
+ *
+ * Copyright (C) 2022 Artur Weber <aweber.kernel@gmail.com>
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include <video/mipi_display.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+/* Manufacturer command set */
+#define MCS_BL_CTL		0xc3
+#define MCS_OTP_RELOAD		0xd0
+#define MCS_PASSWD1		0xf0
+#define MCS_PASSWD2		0xf1
+#define MCS_PASSWD3		0xfc
+
+struct s6d7aa0 {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct gpio_desc *reset_gpio;
+	struct regulator_bulk_data supplies[2];
+	const struct s6d7aa0_panel_desc *desc;
+};
+
+struct s6d7aa0_panel_desc {
+	unsigned int panel_type;
+	int (*init_func)(struct s6d7aa0 *ctx);
+	int (*off_func)(struct s6d7aa0 *ctx);
+	const struct drm_display_mode drm_mode;
+	unsigned long mode_flags;
+	u32 bus_flags;
+	bool has_backlight;
+	bool use_passwd3;
+};
+
+enum s6d7aa0_panels {
+	S6D7AA0_PANEL_LSL080AL02,
+	S6D7AA0_PANEL_LSL080AL03,
+	S6D7AA0_PANEL_LTL101AT01,
+};
+
+static inline struct s6d7aa0 *panel_to_s6d7aa0(struct drm_panel *panel)
+{
+	return container_of(panel, struct s6d7aa0, panel);
+}
+
+static void s6d7aa0_reset(struct s6d7aa0 *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	msleep(50);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	msleep(50);
+}
+
+static int s6d7aa0_lock(struct s6d7aa0 *ctx, bool lock)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	int ret = 0;
+
+	if (lock) {
+		mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD1, 0xa5, 0xa5);
+		mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD2, 0xa5, 0xa5);
+		if (ctx->desc->use_passwd3)
+			mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD3, 0x5a, 0x5a);
+	} else {
+		mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD1, 0x5a, 0x5a);
+		mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD2, 0x5a, 0x5a);
+		if (ctx->desc->use_passwd3)
+			mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD3, 0xa5, 0xa5);
+	}
+
+	return ret;
+}
+
+static int s6d7aa0_on(struct s6d7aa0 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	ret = ctx->desc->init_func(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display on: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int s6d7aa0_off(struct s6d7aa0 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	ret = ctx->desc->off_func(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Panel-specific off function failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_display_off(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display off: %d\n", ret);
+		return ret;
+	}
+	msleep(64);
+
+	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
+		return ret;
+	}
+	msleep(120);
+
+	return 0;
+}
+
+static int s6d7aa0_prepare(struct drm_panel *panel)
+{
+	struct s6d7aa0 *ctx = panel_to_s6d7aa0(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable regulators: %d\n", ret);
+		return ret;
+	}
+
+	s6d7aa0_reset(ctx);
+
+	ret = s6d7aa0_on(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int s6d7aa0_disable(struct drm_panel *panel)
+{
+	struct s6d7aa0 *ctx = panel_to_s6d7aa0(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	ret = s6d7aa0_off(ctx);
+	if (ret < 0)
+		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+	return 0;
+}
+
+static int s6d7aa0_unprepare(struct drm_panel *panel)
+{
+	struct s6d7aa0 *ctx = panel_to_s6d7aa0(panel);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+
+	return 0;
+}
+
+/* Backlight control code */
+
+static int s6d7aa0_bl_update_status(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness = backlight_get_brightness(bl);
+	int ret;
+
+	ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int s6d7aa0_bl_get_brightness(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness;
+	int ret;
+
+	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
+	if (ret < 0)
+		return ret;
+
+	return brightness & 0xff;
+}
+
+static const struct backlight_ops s6d7aa0_bl_ops = {
+	.update_status = s6d7aa0_bl_update_status,
+	.get_brightness = s6d7aa0_bl_get_brightness,
+};
+
+static struct backlight_device *
+s6d7aa0_create_backlight(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	const struct backlight_properties props = {
+		.type = BACKLIGHT_RAW,
+		.brightness = 255,
+		.max_brightness = 255,
+	};
+
+	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+					      &s6d7aa0_bl_ops, &props);
+}
+
+/* Initialization code and structures for LSL080AL02 panel */
+
+static int s6d7aa0_lsl080al02_init(struct s6d7aa0 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	usleep_range(20000, 25000);
+
+	ret = s6d7aa0_lock(ctx, false);
+	if (ret < 0) {
+		dev_err(dev, "Failed to unlock registers: %d\n", ret);
+		return ret;
+	}
+
+	mipi_dsi_dcs_write_seq(dsi, MCS_OTP_RELOAD, 0x00, 0x10);
+	usleep_range(1000, 1500);
+
+	/* SEQ_B6_PARAM_8_R01 */
+	mipi_dsi_dcs_write_seq(dsi, 0xb6, 0x10);
+
+	/* BL_CTL_ON */
+	mipi_dsi_dcs_write_seq(dsi, MCS_BL_CTL, 0x40, 0x00, 0x28);
+
+	usleep_range(5000, 6000);
+
+	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x04);
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
+		return ret;
+	}
+
+	msleep(120);
+	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x00);
+
+	ret = s6d7aa0_lock(ctx, true);
+	if (ret < 0) {
+		dev_err(dev, "Failed to lock registers: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display on: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int s6d7aa0_lsl080al02_off(struct s6d7aa0 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+
+	/* BL_CTL_OFF */
+	mipi_dsi_dcs_write_seq(dsi, MCS_BL_CTL, 0x40, 0x00, 0x20);
+
+	return 0;
+}
+
+static const struct drm_display_mode s6d7aa0_lsl080al02_mode = {
+	.clock = (800 + 16 + 4 + 140) * (1280 + 8 + 4 + 4) * 60 / 1000,
+	.hdisplay = 800,
+	.hsync_start = 800 + 16,
+	.hsync_end = 800 + 16 + 4,
+	.htotal = 800 + 16 + 4 + 140,
+	.vdisplay = 1280,
+	.vsync_start = 1280 + 8,
+	.vsync_end = 1280 + 8 + 4,
+	.vtotal = 1280 + 8 + 4 + 4,
+	.width_mm = 108,
+	.height_mm = 173,
+};
+
+static const struct s6d7aa0_panel_desc s6d7aa0_lsl080al02_desc = {
+	.panel_type = S6D7AA0_PANEL_LSL080AL02,
+	.init_func = s6d7aa0_lsl080al02_init,
+	.off_func = s6d7aa0_lsl080al02_off,
+	.drm_mode = s6d7aa0_lsl080al02_mode,
+	.mode_flags = MIPI_DSI_MODE_VSYNC_FLUSH | MIPI_DSI_MODE_VIDEO_NO_HFP,
+	.bus_flags = DRM_BUS_FLAG_DE_HIGH,
+
+	.has_backlight = false,
+	.use_passwd3 = false,
+};
+
+/* Initialization code and structures for LSL080AL03 panel */
+
+static int s6d7aa0_lsl080al03_init(struct s6d7aa0 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	usleep_range(20000, 25000);
+
+	ret = s6d7aa0_lock(ctx, false);
+	if (ret < 0) {
+		dev_err(dev, "Failed to unlock registers: %d\n", ret);
+		return ret;
+	}
+
+	if (ctx->desc->panel_type == S6D7AA0_PANEL_LSL080AL03) {
+		mipi_dsi_dcs_write_seq(dsi, MCS_BL_CTL, 0xc7, 0x00, 0x29);
+		mipi_dsi_dcs_write_seq(dsi, 0xbc, 0x01, 0x4e, 0xa0);
+		mipi_dsi_dcs_write_seq(dsi, 0xfd, 0x16, 0x10, 0x11, 0x23,
+				       0x09);
+		mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x00, 0x02, 0x03, 0x21,
+				       0x80, 0x78);
+	} else if (ctx->desc->panel_type == S6D7AA0_PANEL_LTL101AT01) {
+		mipi_dsi_dcs_write_seq(dsi, MCS_BL_CTL, 0x40, 0x00, 0x08);
+		mipi_dsi_dcs_write_seq(dsi, 0xbc, 0x01, 0x4e, 0x0b);
+		mipi_dsi_dcs_write_seq(dsi, 0xfd, 0x16, 0x10, 0x11, 0x23,
+				       0x09);
+		mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x00, 0x02, 0x03, 0x21,
+				       0x80, 0x68);
+	}
+
+	mipi_dsi_dcs_write_seq(dsi, 0xb3, 0x51);
+	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x24);
+	mipi_dsi_dcs_write_seq(dsi, 0xf2, 0x02, 0x08, 0x08);
+
+	usleep_range(10000, 11000);
+
+	mipi_dsi_dcs_write_seq(dsi, 0xc0, 0x80, 0x80, 0x30);
+	mipi_dsi_dcs_write_seq(dsi, 0xcd,
+			       0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
+			       0x2e, 0x2e, 0x2e, 0x2e, 0x2e);
+	mipi_dsi_dcs_write_seq(dsi, 0xce,
+			       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x00, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, 0xc1, 0x03);
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
+		return ret;
+	}
+
+	ret = s6d7aa0_lock(ctx, true);
+	if (ret < 0) {
+		dev_err(dev, "Failed to lock registers: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display on: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int s6d7aa0_lsl080al03_off(struct s6d7aa0 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+
+	mipi_dsi_dcs_write_seq(dsi, 0x22, 0x00);
+
+	return 0;
+}
+
+static const struct drm_display_mode s6d7aa0_lsl080al03_mode = {
+	.clock = (768 + 18 + 16 + 126) * (1024 + 8 + 2 + 6) * 60 / 1000,
+	.hdisplay = 768,
+	.hsync_start = 768 + 18,
+	.hsync_end = 768 + 18 + 16,
+	.htotal = 768 + 18 + 16 + 126,
+	.vdisplay = 1024,
+	.vsync_start = 1024 + 8,
+	.vsync_end = 1024 + 8 + 2,
+	.vtotal = 1024 + 8 + 2 + 6,
+	.width_mm = 122,
+	.height_mm = 163,
+};
+
+static const struct s6d7aa0_panel_desc s6d7aa0_lsl080al03_desc = {
+	.panel_type = S6D7AA0_PANEL_LSL080AL03,
+	.init_func = s6d7aa0_lsl080al03_init,
+	.off_func = s6d7aa0_lsl080al03_off,
+	.drm_mode = s6d7aa0_lsl080al03_mode,
+	.mode_flags = MIPI_DSI_MODE_NO_EOT_PACKET,
+	.bus_flags = 0,
+
+	.has_backlight = true,
+	.use_passwd3 = true,
+};
+
+/* Initialization structures for LTL101AT01 panel */
+
+static const struct drm_display_mode s6d7aa0_ltl101at01_mode = {
+	.clock = (768 + 96 + 16 + 184) * (1024 + 8 + 2 + 6) * 60 / 1000,
+	.hdisplay = 768,
+	.hsync_start = 768 + 96,
+	.hsync_end = 768 + 96 + 16,
+	.htotal = 768 + 96 + 16 + 184,
+	.vdisplay = 1024,
+	.vsync_start = 1024 + 8,
+	.vsync_end = 1024 + 8 + 2,
+	.vtotal = 1024 + 8 + 2 + 6,
+	.width_mm = 148,
+	.height_mm = 197,
+};
+
+static const struct s6d7aa0_panel_desc s6d7aa0_ltl101at01_desc = {
+	.panel_type = S6D7AA0_PANEL_LTL101AT01,
+	.init_func = s6d7aa0_lsl080al03_init, /* Similar init to LSL080AL03 */
+	.off_func = s6d7aa0_lsl080al03_off,
+	.drm_mode = s6d7aa0_ltl101at01_mode,
+	.mode_flags = MIPI_DSI_MODE_NO_EOT_PACKET,
+	.bus_flags = 0,
+
+	.has_backlight = true,
+	.use_passwd3 = true,
+};
+
+static int s6d7aa0_get_modes(struct drm_panel *panel,
+					struct drm_connector *connector)
+{
+	struct drm_display_mode *mode;
+	struct s6d7aa0 *ctx;
+
+	ctx = container_of(panel, struct s6d7aa0, panel);
+	if (!ctx)
+		return -EINVAL;
+
+	mode = drm_mode_duplicate(connector->dev, &ctx->desc->drm_mode);
+	if (!mode)
+		return -ENOMEM;
+
+	drm_mode_set_name(mode);
+
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+	connector->display_info.bus_flags = ctx->desc->bus_flags;
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs s6d7aa0_panel_funcs = {
+	.disable = s6d7aa0_disable,
+	.prepare = s6d7aa0_prepare,
+	.unprepare = s6d7aa0_unprepare,
+	.get_modes = s6d7aa0_get_modes,
+};
+
+static int s6d7aa0_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct s6d7aa0 *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->desc = of_device_get_match_data(dev);
+	if (!ctx->desc)
+		return -ENODEV;
+
+	ctx->supplies[0].supply = "power";
+	ctx->supplies[1].supply = "vmipi";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
+					      ctx->supplies);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to get regulators\n");
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ctx->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
+				     "Failed to get reset-gpios\n");
+
+	ctx->dsi = dsi;
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST
+		| ctx->desc->mode_flags;
+
+	drm_panel_init(&ctx->panel, dev, &s6d7aa0_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+	ctx->panel.prepare_prev_first = true;
+
+	ret = drm_panel_of_backlight(&ctx->panel);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get backlight\n");
+
+	/* Use DSI-based backlight as fallback if available */
+	if (ctx->desc->has_backlight && !ctx->panel.backlight) {
+		ctx->panel.backlight = s6d7aa0_create_backlight(dsi);
+		if (IS_ERR(ctx->panel.backlight))
+			return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
+					     "Failed to create backlight\n");
+	}
+
+	drm_panel_add(&ctx->panel);
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
+		drm_panel_remove(&ctx->panel);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void s6d7aa0_remove(struct mipi_dsi_device *dsi)
+{
+	struct s6d7aa0 *ctx = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = mipi_dsi_detach(dsi);
+	if (ret < 0)
+		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
+
+	drm_panel_remove(&ctx->panel);
+}
+
+static const struct of_device_id s6d7aa0_of_match[] = {
+	{
+		.compatible = "samsung,lsl080al02",
+		.data = &s6d7aa0_lsl080al02_desc
+	},
+	{
+		.compatible = "samsung,lsl080al03",
+		.data = &s6d7aa0_lsl080al03_desc
+	},
+	{
+		.compatible = "samsung,ltl101at01",
+		.data = &s6d7aa0_ltl101at01_desc
+	},
+	{ /* sentinel */ }
+};
+
+static struct mipi_dsi_driver s6d7aa0_driver = {
+	.probe = s6d7aa0_probe,
+	.remove = s6d7aa0_remove,
+	.driver = {
+		.name = "panel-samsung-s6d7aa0",
+		.of_match_table = s6d7aa0_of_match,
+	},
+};
+module_mipi_dsi_driver(s6d7aa0_driver);
+
+MODULE_AUTHOR("Artur Weber <aweber.kernel@gmail.com>");
+MODULE_DESCRIPTION("Samsung S6D7AA0 MIPI-DSI LCD controller driver");
+MODULE_LICENSE("GPL");
-- 
2.7.4