drm/panel: Add support for Truly NT35597 panel driver

Add support for Truly NT35597 panel driver used in MSM reference
platforms. This panel driver supports both single DSI and dual
DSI modes.

However, this patch series adds support only for dual DSI mode.

Changes in v10:
- None

Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1538787139-28122-1-git-send-email-abhinavk@codeaurora.org

3 files changed, 683 insertions, 0 deletions

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index b25f6da9dc0b..3f3537719beb 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -204,4 +204,11 @@ config DRM_PANEL_SITRONIX_ST7789V
 	  Say Y here if you want to enable support for the Sitronix
 	  ST7789V controller for 240x320 LCD panels
 
+config DRM_PANEL_TRULY_NT35597_WQXGA
+	tristate "Truly WQXGA"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	help
+	  Say Y here if you want to enable support for Truly NT35597 WQXGA Dual DSI
+	  Video Mode panel
 endmenu
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index b9cea8f50d2a..4396658a7996 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -21,3 +21,4 @@ obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
+obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o
diff --git a/drivers/gpu/drm/panel/panel-truly-nt35597.c b/drivers/gpu/drm/panel/panel-truly-nt35597.c
new file mode 100644
index 000000000000..fc2a66c53db4
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-truly-nt35597.c
@@ -0,0 +1,675 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_mipi_dsi.h>
+
+#include <linux/gpio/consumer.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/regulator/consumer.h>
+
+#include <video/mipi_display.h>
+
+static const char * const regulator_names[] = {
+	"vdda",
+	"vdispp",
+	"vdispn",
+};
+
+static unsigned long const regulator_enable_loads[] = {
+	62000,
+	100000,
+	100000,
+};
+
+static unsigned long const regulator_disable_loads[] = {
+	80,
+	100,
+	100,
+};
+
+struct cmd_set {
+	u8 commands[4];
+	u8 size;
+};
+
+struct nt35597_config {
+	u32 width_mm;
+	u32 height_mm;
+	const char *panel_name;
+	const struct cmd_set *panel_on_cmds;
+	u32 num_on_cmds;
+	const struct drm_display_mode *dm;
+};
+
+struct truly_nt35597 {
+	struct device *dev;
+	struct drm_panel panel;
+
+	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
+
+	struct gpio_desc *reset_gpio;
+	struct gpio_desc *mode_gpio;
+
+	struct backlight_device *backlight;
+
+	struct mipi_dsi_device *dsi[2];
+
+	const struct nt35597_config *config;
+	bool prepared;
+	bool enabled;
+};
+
+static inline struct truly_nt35597 *panel_to_ctx(struct drm_panel *panel)
+{
+	return container_of(panel, struct truly_nt35597, panel);
+}
+
+static const struct cmd_set qcom_2k_panel_magic_cmds[] = {
+	/* CMD2_P0 */
+	{ { 0xff, 0x20 }, 2 },
+	{ { 0xfb, 0x01 }, 2 },
+	{ { 0x00, 0x01 }, 2 },
+	{ { 0x01, 0x55 }, 2 },
+	{ { 0x02, 0x45 }, 2 },
+	{ { 0x05, 0x40 }, 2 },
+	{ { 0x06, 0x19 }, 2 },
+	{ { 0x07, 0x1e }, 2 },
+	{ { 0x0b, 0x73 }, 2 },
+	{ { 0x0c, 0x73 }, 2 },
+	{ { 0x0e, 0xb0 }, 2 },
+	{ { 0x0f, 0xae }, 2 },
+	{ { 0x11, 0xb8 }, 2 },
+	{ { 0x13, 0x00 }, 2 },
+	{ { 0x58, 0x80 }, 2 },
+	{ { 0x59, 0x01 }, 2 },
+	{ { 0x5a, 0x00 }, 2 },
+	{ { 0x5b, 0x01 }, 2 },
+	{ { 0x5c, 0x80 }, 2 },
+	{ { 0x5d, 0x81 }, 2 },
+	{ { 0x5e, 0x00 }, 2 },
+	{ { 0x5f, 0x01 }, 2 },
+	{ { 0x72, 0x11 }, 2 },
+	{ { 0x68, 0x03 }, 2 },
+	/* CMD2_P4 */
+	{ { 0xFF, 0x24 }, 2 },
+	{ { 0xFB, 0x01 }, 2 },
+	{ { 0x00, 0x1C }, 2 },
+	{ { 0x01, 0x0B }, 2 },
+	{ { 0x02, 0x0C }, 2 },
+	{ { 0x03, 0x01 }, 2 },
+	{ { 0x04, 0x0F }, 2 },
+	{ { 0x05, 0x10 }, 2 },
+	{ { 0x06, 0x10 }, 2 },
+	{ { 0x07, 0x10 }, 2 },
+	{ { 0x08, 0x89 }, 2 },
+	{ { 0x09, 0x8A }, 2 },
+	{ { 0x0A, 0x13 }, 2 },
+	{ { 0x0B, 0x13 }, 2 },
+	{ { 0x0C, 0x15 }, 2 },
+	{ { 0x0D, 0x15 }, 2 },
+	{ { 0x0E, 0x17 }, 2 },
+	{ { 0x0F, 0x17 }, 2 },
+	{ { 0x10, 0x1C }, 2 },
+	{ { 0x11, 0x0B }, 2 },
+	{ { 0x12, 0x0C }, 2 },
+	{ { 0x13, 0x01 }, 2 },
+	{ { 0x14, 0x0F }, 2 },
+	{ { 0x15, 0x10 }, 2 },
+	{ { 0x16, 0x10 }, 2 },
+	{ { 0x17, 0x10 }, 2 },
+	{ { 0x18, 0x89 }, 2 },
+	{ { 0x19, 0x8A }, 2 },
+	{ { 0x1A, 0x13 }, 2 },
+	{ { 0x1B, 0x13 }, 2 },
+	{ { 0x1C, 0x15 }, 2 },
+	{ { 0x1D, 0x15 }, 2 },
+	{ { 0x1E, 0x17 }, 2 },
+	{ { 0x1F, 0x17 }, 2 },
+	/* STV */
+	{ { 0x20, 0x40 }, 2 },
+	{ { 0x21, 0x01 }, 2 },
+	{ { 0x22, 0x00 }, 2 },
+	{ { 0x23, 0x40 }, 2 },
+	{ { 0x24, 0x40 }, 2 },
+	{ { 0x25, 0x6D }, 2 },
+	{ { 0x26, 0x40 }, 2 },
+	{ { 0x27, 0x40 }, 2 },
+	/* Vend */
+	{ { 0xE0, 0x00 }, 2 },
+	{ { 0xDC, 0x21 }, 2 },
+	{ { 0xDD, 0x22 }, 2 },
+	{ { 0xDE, 0x07 }, 2 },
+	{ { 0xDF, 0x07 }, 2 },
+	{ { 0xE3, 0x6D }, 2 },
+	{ { 0xE1, 0x07 }, 2 },
+	{ { 0xE2, 0x07 }, 2 },
+	/* UD */
+	{ { 0x29, 0xD8 }, 2 },
+	{ { 0x2A, 0x2A }, 2 },
+	/* CLK */
+	{ { 0x4B, 0x03 }, 2 },
+	{ { 0x4C, 0x11 }, 2 },
+	{ { 0x4D, 0x10 }, 2 },
+	{ { 0x4E, 0x01 }, 2 },
+	{ { 0x4F, 0x01 }, 2 },
+	{ { 0x50, 0x10 }, 2 },
+	{ { 0x51, 0x00 }, 2 },
+	{ { 0x52, 0x80 }, 2 },
+	{ { 0x53, 0x00 }, 2 },
+	{ { 0x56, 0x00 }, 2 },
+	{ { 0x54, 0x07 }, 2 },
+	{ { 0x58, 0x07 }, 2 },
+	{ { 0x55, 0x25 }, 2 },
+	/* Reset XDONB */
+	{ { 0x5B, 0x43 }, 2 },
+	{ { 0x5C, 0x00 }, 2 },
+	{ { 0x5F, 0x73 }, 2 },
+	{ { 0x60, 0x73 }, 2 },
+	{ { 0x63, 0x22 }, 2 },
+	{ { 0x64, 0x00 }, 2 },
+	{ { 0x67, 0x08 }, 2 },
+	{ { 0x68, 0x04 }, 2 },
+	/* Resolution:1440x2560 */
+	{ { 0x72, 0x02 }, 2 },
+	/* mux */
+	{ { 0x7A, 0x80 }, 2 },
+	{ { 0x7B, 0x91 }, 2 },
+	{ { 0x7C, 0xD8 }, 2 },
+	{ { 0x7D, 0x60 }, 2 },
+	{ { 0x7F, 0x15 }, 2 },
+	{ { 0x75, 0x15 }, 2 },
+	/* ABOFF */
+	{ { 0xB3, 0xC0 }, 2 },
+	{ { 0xB4, 0x00 }, 2 },
+	{ { 0xB5, 0x00 }, 2 },
+	/* Source EQ */
+	{ { 0x78, 0x00 }, 2 },
+	{ { 0x79, 0x00 }, 2 },
+	{ { 0x80, 0x00 }, 2 },
+	{ { 0x83, 0x00 }, 2 },
+	/* FP BP */
+	{ { 0x93, 0x0A }, 2 },
+	{ { 0x94, 0x0A }, 2 },
+	/* Inversion Type */
+	{ { 0x8A, 0x00 }, 2 },
+	{ { 0x9B, 0xFF }, 2 },
+	/* IMGSWAP =1 @PortSwap=1 */
+	{ { 0x9D, 0xB0 }, 2 },
+	{ { 0x9F, 0x63 }, 2 },
+	{ { 0x98, 0x10 }, 2 },
+	/* FRM */
+	{ { 0xEC, 0x00 }, 2 },
+	/* CMD1 */
+	{ { 0xFF, 0x10 }, 2 },
+	/* VBP+VSA=,VFP = 10H */
+	{ { 0x3B, 0x03, 0x0A, 0x0A }, 4 },
+	/* FTE on */
+	{ { 0x35, 0x00 }, 2 },
+	/* EN_BK =1(auto black) */
+	{ { 0xE5, 0x01 }, 2 },
+	/* CMD mode(10) VDO mode(03) */
+	{ { 0xBB, 0x03 }, 2 },
+	/* Non Reload MTP */
+	{ { 0xFB, 0x01 }, 2 },
+};
+
+static int truly_dcs_write(struct drm_panel *panel, u32 command)
+{
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	int i, ret;
+
+	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
+		ret = mipi_dsi_dcs_write(ctx->dsi[i], command, NULL, 0);
+		if (ret < 0) {
+			DRM_DEV_ERROR(ctx->dev,
+				"cmd 0x%x failed for dsi = %d\n",
+				command, i);
+		}
+	}
+
+	return ret;
+}
+
+static int truly_dcs_write_buf(struct drm_panel *panel,
+	u32 size, const u8 *buf)
+{
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	int ret = 0;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
+		ret = mipi_dsi_dcs_write_buffer(ctx->dsi[i], buf, size);
+		if (ret < 0) {
+			DRM_DEV_ERROR(ctx->dev,
+				"failed to tx cmd [%d], err: %d\n", i, ret);
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
+static int truly_35597_power_on(struct truly_nt35597 *ctx)
+{
+	int ret, i;
+
+	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++) {
+		ret = regulator_set_load(ctx->supplies[i].consumer,
+					regulator_enable_loads[i]);
+		if (ret)
+			return ret;
+	}
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Reset sequence of truly panel requires the panel to be
+	 * out of reset for 10ms, followed by being held in reset
+	 * for 10ms and then out again
+	 */
+	gpiod_set_value(ctx->reset_gpio, 0);
+	usleep_range(10000, 20000);
+	gpiod_set_value(ctx->reset_gpio, 1);
+	usleep_range(10000, 20000);
+	gpiod_set_value(ctx->reset_gpio, 0);
+
+	return 0;
+}
+
+static int truly_nt35597_power_off(struct truly_nt35597 *ctx)
+{
+	int ret = 0;
+	int i;
+
+	gpiod_set_value(ctx->reset_gpio, 1);
+
+	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++) {
+		ret = regulator_set_load(ctx->supplies[i].consumer,
+				regulator_disable_loads[i]);
+		if (ret) {
+			DRM_DEV_ERROR(ctx->dev,
+				"regulator_set_load failed %d\n", ret);
+			return ret;
+		}
+	}
+
+	ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret) {
+		DRM_DEV_ERROR(ctx->dev,
+			"regulator_bulk_disable failed %d\n", ret);
+	}
+	return ret;
+}
+
+static int truly_nt35597_disable(struct drm_panel *panel)
+{
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	int ret;
+
+	if (!ctx->enabled)
+		return 0;
+
+	if (ctx->backlight) {
+		ret = backlight_disable(ctx->backlight);
+		if (ret < 0)
+			DRM_DEV_ERROR(ctx->dev, "backlight disable failed %d\n",
+				ret);
+	}
+
+	ctx->enabled = false;
+	return 0;
+}
+
+static int truly_nt35597_unprepare(struct drm_panel *panel)
+{
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	int ret = 0;
+
+	if (!ctx->prepared)
+		return 0;
+
+	ctx->dsi[0]->mode_flags = 0;
+	ctx->dsi[1]->mode_flags = 0;
+
+	ret = truly_dcs_write(panel, MIPI_DCS_SET_DISPLAY_OFF);
+	if (ret < 0) {
+		DRM_DEV_ERROR(ctx->dev,
+			"set_display_off cmd failed ret = %d\n",
+			ret);
+	}
+
+	/* 120ms delay required here as per DCS spec */
+	msleep(120);
+
+	ret = truly_dcs_write(panel, MIPI_DCS_ENTER_SLEEP_MODE);
+	if (ret < 0) {
+		DRM_DEV_ERROR(ctx->dev,
+			"enter_sleep cmd failed ret = %d\n", ret);
+	}
+
+	ret = truly_nt35597_power_off(ctx);
+	if (ret < 0)
+		DRM_DEV_ERROR(ctx->dev, "power_off failed ret = %d\n", ret);
+
+	ctx->prepared = false;
+	return ret;
+}
+
+static int truly_nt35597_prepare(struct drm_panel *panel)
+{
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	int ret;
+	int i;
+	const struct cmd_set *panel_on_cmds;
+	const struct nt35597_config *config;
+	u32 num_cmds;
+
+	if (ctx->prepared)
+		return 0;
+
+	ret = truly_35597_power_on(ctx);
+	if (ret < 0)
+		return ret;
+
+	ctx->dsi[0]->mode_flags |= MIPI_DSI_MODE_LPM;
+	ctx->dsi[1]->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	config = ctx->config;
+	panel_on_cmds = config->panel_on_cmds;
+	num_cmds = config->num_on_cmds;
+
+	for (i = 0; i < num_cmds; i++) {
+		ret = truly_dcs_write_buf(panel,
+				panel_on_cmds[i].size,
+					panel_on_cmds[i].commands);
+		if (ret < 0) {
+			DRM_DEV_ERROR(ctx->dev,
+				"cmd set tx failed i = %d ret = %d\n",
+					i, ret);
+			goto power_off;
+		}
+	}
+
+	ret = truly_dcs_write(panel, MIPI_DCS_EXIT_SLEEP_MODE);
+	if (ret < 0) {
+		DRM_DEV_ERROR(ctx->dev,
+			"exit_sleep_mode cmd failed ret = %d\n",
+			ret);
+		goto power_off;
+	}
+
+	/* Per DSI spec wait 120ms after sending exit sleep DCS command */
+	msleep(120);
+
+	ret = truly_dcs_write(panel, MIPI_DCS_SET_DISPLAY_ON);
+	if (ret < 0) {
+		DRM_DEV_ERROR(ctx->dev,
+			"set_display_on cmd failed ret = %d\n", ret);
+		goto power_off;
+	}
+
+	/* Per DSI spec wait 120ms after sending set_display_on DCS command */
+	msleep(120);
+
+	ctx->prepared = true;
+
+	return 0;
+
+power_off:
+	if (truly_nt35597_power_off(ctx))
+		DRM_DEV_ERROR(ctx->dev, "power_off failed\n");
+	return ret;
+}
+
+static int truly_nt35597_enable(struct drm_panel *panel)
+{
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	int ret;
+
+	if (ctx->enabled)
+		return 0;
+
+	if (ctx->backlight) {
+		ret = backlight_enable(ctx->backlight);
+		if (ret < 0)
+			DRM_DEV_ERROR(ctx->dev, "backlight enable failed %d\n",
+						  ret);
+	}
+
+	ctx->enabled = true;
+
+	return 0;
+}
+
+static int truly_nt35597_get_modes(struct drm_panel *panel)
+{
+	struct drm_connector *connector = panel->connector;
+	struct truly_nt35597 *ctx = panel_to_ctx(panel);
+	struct drm_display_mode *mode;
+	const struct nt35597_config *config;
+
+	config = ctx->config;
+	mode = drm_mode_create(connector->dev);
+	if (!mode) {
+		DRM_DEV_ERROR(ctx->dev,
+			"failed to create a new display mode\n");
+		return 0;
+	}
+
+	connector->display_info.width_mm = config->width_mm;
+	connector->display_info.height_mm = config->height_mm;
+	drm_mode_copy(mode, config->dm);
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs truly_nt35597_drm_funcs = {
+	.disable = truly_nt35597_disable,
+	.unprepare = truly_nt35597_unprepare,
+	.prepare = truly_nt35597_prepare,
+	.enable = truly_nt35597_enable,
+	.get_modes = truly_nt35597_get_modes,
+};
+
+static int truly_nt35597_panel_add(struct truly_nt35597 *ctx)
+{
+	struct device *dev = ctx->dev;
+	int ret, i;
+	const struct nt35597_config *config;
+
+	config = ctx->config;
+	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++)
+		ctx->supplies[i].supply = regulator_names[i];
+
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
+				      ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->reset_gpio)) {
+		DRM_DEV_ERROR(dev, "cannot get reset gpio %ld\n",
+			PTR_ERR(ctx->reset_gpio));
+		return PTR_ERR(ctx->reset_gpio);
+	}
+
+	ctx->mode_gpio = devm_gpiod_get(dev, "mode", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->mode_gpio)) {
+		DRM_DEV_ERROR(dev, "cannot get mode gpio %ld\n",
+			PTR_ERR(ctx->mode_gpio));
+		return PTR_ERR(ctx->mode_gpio);
+	}
+
+	/* dual port */
+	gpiod_set_value(ctx->mode_gpio, 0);
+
+	drm_panel_init(&ctx->panel);
+	ctx->panel.dev = dev;
+	ctx->panel.funcs = &truly_nt35597_drm_funcs;
+	drm_panel_add(&ctx->panel);
+
+	return 0;
+}
+
+static const struct drm_display_mode qcom_sdm845_mtp_2k_mode = {
+	.name = "1440x2560",
+	.clock = 268316,
+	.hdisplay = 1440,
+	.hsync_start = 1440 + 200,
+	.hsync_end = 1440 + 200 + 32,
+	.htotal = 1440 + 200 + 32 + 64,
+	.vdisplay = 2560,
+	.vsync_start = 2560 + 8,
+	.vsync_end = 2560 + 8 + 1,
+	.vtotal = 2560 + 8 + 1 + 7,
+	.vrefresh = 60,
+	.flags = 0,
+};
+
+static const struct nt35597_config nt35597_dir = {
+	.width_mm = 74,
+	.height_mm = 131,
+	.panel_name = "qcom_sdm845_mtp_2k_panel",
+	.dm = &qcom_sdm845_mtp_2k_mode,
+	.panel_on_cmds = qcom_2k_panel_magic_cmds,
+	.num_on_cmds = ARRAY_SIZE(qcom_2k_panel_magic_cmds),
+};
+
+static int truly_nt35597_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct truly_nt35597 *ctx;
+	struct mipi_dsi_device *dsi1_device;
+	struct device_node *dsi1;
+	struct mipi_dsi_host *dsi1_host;
+	struct mipi_dsi_device *dsi_dev;
+	int ret = 0;
+	int i;
+
+	const struct mipi_dsi_device_info info = {
+		.type = "trulynt35597",
+		.channel = 0,
+		.node = NULL,
+	};
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+
+	if (!ctx)
+		return -ENOMEM;
+
+	/*
+	 * This device represents itself as one with two input ports which are
+	 * fed by the output ports of the two DSI controllers . The DSI0 is
+	 * the master controller and has most of the panel related info in its
+	 * child node.
+	 */
+
+	ctx->config = of_device_get_match_data(dev);
+
+	if (!ctx->config) {
+		dev_err(dev, "missing device configuration\n");
+		return -ENODEV;
+	}
+
+	dsi1 = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
+	if (!dsi1) {
+		DRM_DEV_ERROR(dev,
+			"failed to get remote node for dsi1_device\n");
+		return -ENODEV;
+	}
+
+	dsi1_host = of_find_mipi_dsi_host_by_node(dsi1);
+	of_node_put(dsi1);
+	if (!dsi1_host) {
+		DRM_DEV_ERROR(dev, "failed to find dsi host\n");
+		return -EPROBE_DEFER;
+	}
+
+	/* register the second DSI device */
+	dsi1_device = mipi_dsi_device_register_full(dsi1_host, &info);
+	if (IS_ERR(dsi1_device)) {
+		DRM_DEV_ERROR(dev, "failed to create dsi device\n");
+		return PTR_ERR(dsi1_device);
+	}
+
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	ctx->dev = dev;
+	ctx->dsi[0] = dsi;
+	ctx->dsi[1] = dsi1_device;
+
+	ret = truly_nt35597_panel_add(ctx);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "failed to add panel\n");
+		goto err_panel_add;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
+		dsi_dev = ctx->dsi[i];
+		dsi_dev->lanes = 4;
+		dsi_dev->format = MIPI_DSI_FMT_RGB888;
+		dsi_dev->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM |
+			MIPI_DSI_CLOCK_NON_CONTINUOUS;
+		ret = mipi_dsi_attach(dsi_dev);
+		if (ret < 0) {
+			DRM_DEV_ERROR(dev,
+				"dsi attach failed i = %d\n", i);
+			goto err_dsi_attach;
+		}
+	}
+
+	return 0;
+
+err_dsi_attach:
+	drm_panel_remove(&ctx->panel);
+err_panel_add:
+	mipi_dsi_device_unregister(dsi1_device);
+	return ret;
+}
+
+static int truly_nt35597_remove(struct mipi_dsi_device *dsi)
+{
+	struct truly_nt35597 *ctx = mipi_dsi_get_drvdata(dsi);
+
+	if (ctx->dsi[0])
+		mipi_dsi_detach(ctx->dsi[0]);
+	if (ctx->dsi[1]) {
+		mipi_dsi_detach(ctx->dsi[1]);
+		mipi_dsi_device_unregister(ctx->dsi[1]);
+	}
+
+	drm_panel_remove(&ctx->panel);
+	return 0;
+}
+
+static const struct of_device_id truly_nt35597_of_match[] = {
+	{
+		.compatible = "truly,nt35597-2K-display",
+		.data = &nt35597_dir,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, truly_nt35597_of_match);
+
+static struct mipi_dsi_driver truly_nt35597_driver = {
+	.driver = {
+		.name = "panel-truly-nt35597",
+		.of_match_table = truly_nt35597_of_match,
+	},
+	.probe = truly_nt35597_probe,
+	.remove = truly_nt35597_remove,
+};
+module_mipi_dsi_driver(truly_nt35597_driver);
+
+MODULE_DESCRIPTION("Truly NT35597 DSI Panel Driver");
+MODULE_LICENSE("GPL v2");