[PATCH 0/3] drm/panel: Add Smartisan TD4362 panel support

[PATCH 0/3] drm/panel: Add Smartisan TD4362 panel support

[tianshi12127]

From: Lu Chen <tianshi12127@gmail.com>

This series adds support for the Smartisan TD4362, a 1080x2242
command mode DSI panel found in the Smartisan R1 (trident)
smartphone.

The initialization and power sequences were converted from the
downstream device tree with linux-mdss-dsi-panel-driver-generator,
and the driver was tested on a Smartisan R1 (trident).

Patch 1 adds the "smartisan" vendor prefix, patch 2 documents the
panel binding, and patch 3 adds the DRM panel driver itself.

Lu Chen (3):
  dt-bindings: vendor-prefixes: add smartisan
  dt-bindings: display: panel: add Smartisan TD4362
  drm/panel: add driver for Smartisan TD4362

 .../display/panel/smartisan,td4362.yaml       |  75 +++++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 drivers/gpu/drm/panel/Kconfig                 |  13 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../gpu/drm/panel/panel-smartisan-td4362.c    | 263 ++++++++++++++++++
 5 files changed, 354 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml
 create mode 100644 drivers/gpu/drm/panel/panel-smartisan-td4362.c

-- 
2.56.0

[PATCH 1/3] dt-bindings: vendor-prefixes: add smartisan

[tianshi12127]

From: Lu Chen <tianshi12127@gmail.com>

Add a vendor prefix for Smartisan Technology, used by Smartisan
devices such as the R1 (trident).

Signed-off-by: Lu Chen <tianshi12127@gmail.com>
---
 Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 28784d66ae7b..6ad8d3499227 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -1535,6 +1535,8 @@ patternProperties:
     description: Skyworks Solutions, Inc.
   "^smartfiber,.*":
     description: ShenZhen Smartfiber Technology Co, Ltd.
+  "^smartisan,.*":
+    description: Smartisan Technology Co., Ltd.
   "^smartlabs,.*":
     description: SmartLabs LLC
   "^smartrg,.*":
-- 
2.56.0

[PATCH 2/3] dt-bindings: display: panel: add Smartisan TD4362

[tianshi12127]

From: Lu Chen <tianshi12127@gmail.com>

Document the Smartisan TD4362, a 1080x2242 command mode panel
found in the Smartisan R1 (trident) smartphone.

Signed-off-by: Lu Chen <tianshi12127@gmail.com>
---
 .../display/panel/smartisan,td4362.yaml       | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml

diff --git a/Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml b/Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml
new file mode 100644
index 000000000000..a46bc2f53030
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/smartisan,td4362.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Smartisan TD4362 MIPI-DSI panel
+
+maintainers:
+  - Lu Chen <tianshi12127@gmail.com>
+
+description:
+  The Smartisan TD4362 is a 1080x2242 command mode panel found in the
+  Smartisan R1 (trident) smartphone.
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    items:
+      - const: smartisan,td4362
+
+  reg:
+    maxItems: 1
+
+  vddio-supply:
+    description: I/O voltage rail
+
+  lab-supply:
+    description: Positive source voltage rail
+
+  ibb-supply:
+    description: Negative source voltage rail
+
+  reset-gpios:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - vddio-supply
+  - lab-supply
+  - ibb-supply
+  - reset-gpios
+  - port
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "smartisan,td4362";
+            reg = <0>;
+            vddio-supply = <&vreg_l14a_1p88>;
+            lab-supply = <&lab>;
+            ibb-supply = <&ibb>;
+            reset-gpios = <&tlmm 6 GPIO_ACTIVE_LOW>;
+            backlight = <&backlight>;
+
+            port {
+                panel_in: endpoint {
+                    remote-endpoint = <&dsi_out>;
+                };
+            };
+        };
+    };
+
+...
-- 
2.56.0

[PATCH 3/3] drm/panel: add driver for Smartisan TD4362

[tianshi12127]

From: Lu Chen <tianshi12127@gmail.com>

Add support for the Smartisan TD4362 1080x2242 command mode DSI
panel found in the Smartisan R1 (trident) smartphone.

The initialization and power sequences were generated from the
downstream device tree with linux-mdss-dsi-panel-driver-generator.

Tested on a Smartisan R1 (trident).

Signed-off-by: Lu Chen <tianshi12127@gmail.com>
---
 drivers/gpu/drm/panel/Kconfig                 |  13 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../gpu/drm/panel/panel-smartisan-td4362.c    | 263 ++++++++++++++++++
 3 files changed, 277 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-smartisan-td4362.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index b30d7781745c..0b413152267f 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -1124,6 +1124,19 @@ 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_SMARTISAN_TD4362
+	tristate "Smartisan TD4362 DSI panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y here if you want to enable support for the Smartisan TD4362
+	  1080x2242 command mode panel found in the Smartisan R1 (trident)
+	  smartphone. The panel is driven over four MIPI DSI lanes in
+	  command mode.
+
+	  If unsure, say N.
+
 config DRM_PANEL_SONY_ACX565AKM
 	tristate "Sony ACX565AKM panel"
 	depends on GPIOLIB && OF && SPI
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 4532f79021ea..bc4fad310554 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -112,6 +112,7 @@ obj-$(CONFIG_DRM_PANEL_SHARP_LS060T1SX01) += panel-sharp-ls060t1sx01.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7701) += panel-sitronix-st7701.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7703) += panel-sitronix-st7703.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
+obj-$(CONFIG_DRM_PANEL_SMARTISAN_TD4362) += panel-smartisan-td4362.o
 obj-$(CONFIG_DRM_PANEL_SUMMIT) += panel-summit.o
 obj-$(CONFIG_DRM_PANEL_SYNAPTICS_R63353) += panel-synaptics-r63353.o
 obj-$(CONFIG_DRM_PANEL_SYNAPTICS_TDDI) += panel-synaptics-tddi.o
diff --git a/drivers/gpu/drm/panel/panel-smartisan-td4362.c b/drivers/gpu/drm/panel/panel-smartisan-td4362.c
new file mode 100644
index 000000000000..dad4442d0421
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-smartisan-td4362.c
@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (c) 2026 Lu Chen <tianshi12127@gmail.com>
+// Generated with linux-mdss-dsi-panel-driver-generator from vendor device tree:
+//   Copyright (c) 2013, The Linux Foundation. All rights reserved.
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+
+struct smartisan_td4362 {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct regulator_bulk_data *supplies;
+	struct gpio_desc *reset_gpio;
+};
+
+static const struct regulator_bulk_data smartisan_td4362_supplies[] = {
+	{ .supply = "vddio" },
+	{ .supply = "lab" },
+	{ .supply = "ibb" },
+};
+
+static inline struct smartisan_td4362 *to_smartisan_td4362(struct drm_panel *panel)
+{
+	return container_of(panel, struct smartisan_td4362, panel);
+}
+
+static void smartisan_td4362_reset(struct smartisan_td4362 *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 10100);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(10000, 10100);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 10100);
+}
+
+static int smartisan_td4362_on(struct smartisan_td4362 *ctx)
+{
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+
+	ctx->dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
+				     0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY,
+				     0x24);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_POWER_SAVE, 0x82);
+	mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	mipi_dsi_dcs_set_column_address_multi(&dsi_ctx, 0x0000, 0x0437);
+	mipi_dsi_dcs_set_page_address_multi(&dsi_ctx, 0x0000, 0x08c1);
+	mipi_dsi_dcs_set_tear_scanline_multi(&dsi_ctx, 0x07fa);
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 80);
+
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x04);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9,
+					 0x9b, 0x51, 0x07, 0xe6, 0x00, 0x10,
+					 0x00);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xba,
+					 0xbb, 0x2f, 0x1d, 0xbe, 0x00, 0x10,
+					 0x04);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xce,
+					 0x5d, 0x40, 0x60, 0x78, 0x87, 0x94,
+					 0x9e, 0xab, 0xb8, 0xc4, 0xcd, 0xd6,
+					 0xde, 0xe5, 0xec, 0xf3, 0xfd, 0xff,
+					 0x04, 0x28, 0x04, 0x04, 0x42, 0x00,
+					 0x69, 0x5a, 0x40, 0x01, 0xf4, 0x00,
+					 0x00, 0x04, 0xfa, 0x00);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xca,
+					 0x1d, 0xfc, 0xfc, 0xfc, 0x00, 0x07,
+					 0x07, 0x00, 0x00, 0x00, 0xeb, 0xe7,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf9, 0x64);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x03);
+
+	return dsi_ctx.accum_err;
+}
+
+static int smartisan_td4362_off(struct smartisan_td4362 *ctx)
+{
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+
+	ctx->dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_usleep_range(&dsi_ctx, 16000, 17000);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 64);
+
+	return dsi_ctx.accum_err;
+}
+
+static int smartisan_td4362_prepare(struct drm_panel *panel)
+{
+	struct smartisan_td4362 *ctx = to_smartisan_td4362(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(smartisan_td4362_supplies),
+				    ctx->supplies);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable regulators: %d\n", ret);
+		return ret;
+	}
+
+	msleep(100);
+
+	smartisan_td4362_reset(ctx);
+
+	ret = smartisan_td4362_on(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+		regulator_bulk_disable(ARRAY_SIZE(smartisan_td4362_supplies),
+				       ctx->supplies);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int smartisan_td4362_unprepare(struct drm_panel *panel)
+{
+	struct smartisan_td4362 *ctx = to_smartisan_td4362(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	ret = smartisan_td4362_off(ctx);
+	if (ret < 0)
+		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	regulator_bulk_disable(ARRAY_SIZE(smartisan_td4362_supplies),
+			       ctx->supplies);
+
+	return 0;
+}
+
+static const struct drm_display_mode smartisan_td4362_mode = {
+	.clock = (1080 + 44 + 2 + 60) * (2242 + 8 + 2 + 100) * 60 / 1000,
+	.hdisplay = 1080,
+	.hsync_start = 1080 + 44,
+	.hsync_end = 1080 + 44 + 2,
+	.htotal = 1080 + 44 + 2 + 60,
+	.vdisplay = 2242,
+	.vsync_start = 2242 + 8,
+	.vsync_end = 2242 + 8 + 2,
+	.vtotal = 2242 + 8 + 2 + 100,
+	.width_mm = 64,
+	.height_mm = 117,
+	.type = DRM_MODE_TYPE_DRIVER,
+};
+
+static int smartisan_td4362_get_modes(struct drm_panel *panel,
+				      struct drm_connector *connector)
+{
+	return drm_connector_helper_get_modes_fixed(connector,
+						    &smartisan_td4362_mode);
+}
+
+static const struct drm_panel_funcs smartisan_td4362_panel_funcs = {
+	.prepare = smartisan_td4362_prepare,
+	.unprepare = smartisan_td4362_unprepare,
+	.get_modes = smartisan_td4362_get_modes,
+};
+
+static int smartisan_td4362_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct smartisan_td4362 *ctx;
+	int ret;
+
+	ctx = devm_drm_panel_alloc(dev, struct smartisan_td4362, panel,
+				   &smartisan_td4362_panel_funcs,
+				   DRM_MODE_CONNECTOR_DSI);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
+
+	ret = devm_regulator_bulk_get_const(dev,
+					    ARRAY_SIZE(smartisan_td4362_supplies),
+					    smartisan_td4362_supplies,
+					    &ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	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_CLOCK_NON_CONTINUOUS;
+
+	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");
+
+	drm_panel_add(&ctx->panel);
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		drm_panel_remove(&ctx->panel);
+		return dev_err_probe(dev, ret, "Failed to attach to DSI host\n");
+	}
+
+	return 0;
+}
+
+static void smartisan_td4362_remove(struct mipi_dsi_device *dsi)
+{
+	struct smartisan_td4362 *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 smartisan_td4362_of_match[] = {
+	{ .compatible = "smartisan,td4362" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, smartisan_td4362_of_match);
+
+static struct mipi_dsi_driver smartisan_td4362_driver = {
+	.probe = smartisan_td4362_probe,
+	.remove = smartisan_td4362_remove,
+	.driver = {
+		.name = "panel-smartisan-td4362",
+		.of_match_table = smartisan_td4362_of_match,
+	},
+};
+module_mipi_dsi_driver(smartisan_td4362_driver);
+
+MODULE_AUTHOR("Lu Chen <tianshi12127@gmail.com>");
+MODULE_DESCRIPTION("DRM driver for Smartisan TD4362 1080p command mode DSI panel");
+MODULE_LICENSE("GPL");
-- 
2.56.0

Re: [PATCH 2/3] dt-bindings: display: panel: add Smartisan TD4362

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Medium] dt-bindings: display: panel: smartisan,td4362 uses PMIC lab/ibb supply names
--

commit 6d3f290b8760784bb6a0903d2ec93dcc896d4221
Author: Lu Chen <tianshi12127@gmail.com>

dt-bindings: display: panel: add Smartisan TD4362

This commit documents the devicetree binding for the Smartisan TD4362
1080x2242 command mode MIPI-DSI panel found in the Smartisan R1
smartphone.

> diff --git a/Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml b/Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml
> new file mode 100644
> index 0000000000000..a46bc2f530300
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml
> @@ -0,0 +1,75 @@

[ ... ]

> +properties:
> +  compatible:
> +    items:
> +      - const: smartisan,td4362
> +
> +  reg:
> +    maxItems: 1
> +
> +  vddio-supply:
> +    description: I/O voltage rail
> +
> +  lab-supply:
> +    description: Positive source voltage rail
> +
> +  ibb-supply:
> +    description: Negative source voltage rail

[Severity: Medium]
Should lab-supply and ibb-supply in properties, required, and examples be
named vsp-supply and vsn-supply instead?

In devicetree bindings, *-supply properties on a consumer node describe the
power rail inputs of the panel itself rather than the host PMIC regulator
blocks (Qualcomm LAB and IBB) that supply them.

As noted in the property descriptions (Positive source voltage rail and
Negative source voltage rail) and in other Synaptics TD43xx panel bindings
such as Documentation/devicetree/bindings/display/panel/boe,td4320.yaml,
sony,td4353-jdi.yaml, and synaptics,td4300-panel.yaml, the panel's positive
and negative source voltage inputs are vsp-supply and vsn-supply (wired as
vsp-supply = <&lab>; and vsn-supply = <&ibb>; in the board devicetree).

> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - vddio-supply
> +  - lab-supply
> +  - ibb-supply
> +  - reset-gpios
> +  - port

[ ... ]

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261017083531.766557-1-tianshi12127@gmail.com?part=2

Re: [PATCH 1/3] dt-bindings: vendor-prefixes: add smartisan

[Krzysztof Kozlowski]

On 17/10/2026 10:35, tianshi12127 wrote:
> From: Lu Chen <tianshi12127@gmail.com>
> 
> Add a vendor prefix for Smartisan Technology, used by Smartisan
> devices such as the R1 (trident).
> 
> Signed-off-by: Lu Chen <tianshi12127@gmail.com>


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof

Re: [PATCH 2/3] dt-bindings: display: panel: add Smartisan TD4362

[Krzysztof Kozlowski]

On 17/10/2026 10:35, tianshi12127 wrote:
> From: Lu Chen <tianshi12127@gmail.com>
> 
> Document the Smartisan TD4362, a 1080x2242 command mode panel
> found in the Smartisan R1 (trident) smartphone.
> 
> Signed-off-by: Lu Chen <tianshi12127@gmail.com>
> ---


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof

[PATCH v2 0/3] drm/panel: Add Smartisan TD4362 panel support

[tianshi12127]

From: Lu Chen <tianshi12127@gmail.com>

This series adds support for the Smartisan TD4362, a 1080x2242
command mode DSI panel found in the Smartisan R1 (trident)
smartphone.

The initialization and power sequences were converted from the
downstream device tree with linux-mdss-dsi-panel-driver-generator,
and the driver was tested on a Smartisan R1 (trident).

Patch 1 adds the "smartisan" vendor prefix, patch 2 documents the
panel binding, and patch 3 adds the DRM panel driver itself.

Changes in v2:
- rename lab-supply/ibb-supply to vsp-supply/vsn-supply (per review)

Lu Chen (3):
  dt-bindings: vendor-prefixes: add smartisan
  dt-bindings: display: panel: add Smartisan TD4362
  drm/panel: add driver for Smartisan TD4362

 .../display/panel/smartisan,td4362.yaml       |  75 +++++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 drivers/gpu/drm/panel/Kconfig                 |  13 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../gpu/drm/panel/panel-smartisan-td4362.c    | 263 ++++++++++++++++++
 5 files changed, 354 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml
 create mode 100644 drivers/gpu/drm/panel/panel-smartisan-td4362.c

-- 
2.56.0

[PATCH v2 1/3] dt-bindings: vendor-prefixes: add smartisan

[tianshi12127]

From: Lu Chen <tianshi12127@gmail.com>

Add a vendor prefix for Smartisan Technology, used by Smartisan
devices such as the R1 (trident).

Signed-off-by: Lu Chen <tianshi12127@gmail.com>
---
 Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 28784d66ae7b..6ad8d3499227 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -1535,6 +1535,8 @@ patternProperties:
     description: Skyworks Solutions, Inc.
   "^smartfiber,.*":
     description: ShenZhen Smartfiber Technology Co, Ltd.
+  "^smartisan,.*":
+    description: Smartisan Technology Co., Ltd.
   "^smartlabs,.*":
     description: SmartLabs LLC
   "^smartrg,.*":
-- 
2.56.0

[PATCH v2 2/3] dt-bindings: display: panel: add Smartisan TD4362

[tianshi12127]

From: Lu Chen <tianshi12127@gmail.com>

Document the Smartisan TD4362, a 1080x2242 command mode panel
found in the Smartisan R1 (trident) smartphone.

Signed-off-by: Lu Chen <tianshi12127@gmail.com>
---
 .../display/panel/smartisan,td4362.yaml       | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml

diff --git a/Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml b/Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml
new file mode 100644
index 000000000000..d9a18cbe635a
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/smartisan,td4362.yaml
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/smartisan,td4362.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Smartisan TD4362 MIPI-DSI panel
+
+maintainers:
+  - Lu Chen <tianshi12127@gmail.com>
+
+description:
+  The Smartisan TD4362 is a 1080x2242 command mode panel found in the
+  Smartisan R1 (trident) smartphone.
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    items:
+      - const: smartisan,td4362
+
+  reg:
+    maxItems: 1
+
+  vddio-supply:
+    description: I/O voltage rail
+
+  vsp-supply:
+    description: Positive source voltage rail
+
+  vsn-supply:
+    description: Negative source voltage rail
+
+  reset-gpios:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - vddio-supply
+  - vsp-supply
+  - vsn-supply
+  - reset-gpios
+  - port
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "smartisan,td4362";
+            reg = <0>;
+            vddio-supply = <&vreg_l14a_1p88>;
+            vsp-supply = <&lab>;
+            vsn-supply = <&ibb>;
+            reset-gpios = <&tlmm 6 GPIO_ACTIVE_LOW>;
+            backlight = <&backlight>;
+
+            port {
+                panel_in: endpoint {
+                    remote-endpoint = <&dsi_out>;
+                };
+            };
+        };
+    };
+
+...
-- 
2.56.0

[PATCH v2 3/3] drm/panel: add driver for Smartisan TD4362

[tianshi12127]

From: Lu Chen <tianshi12127@gmail.com>

Add support for the Smartisan TD4362 1080x2242 command mode DSI
panel found in the Smartisan R1 (trident) smartphone.

The initialization and power sequences were generated from the
downstream device tree with linux-mdss-dsi-panel-driver-generator.

Tested on a Smartisan R1 (trident).

Signed-off-by: Lu Chen <tianshi12127@gmail.com>
---
 drivers/gpu/drm/panel/Kconfig                 |  13 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../gpu/drm/panel/panel-smartisan-td4362.c    | 263 ++++++++++++++++++
 3 files changed, 277 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-smartisan-td4362.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index b30d7781745c..0b413152267f 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -1124,6 +1124,19 @@ 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_SMARTISAN_TD4362
+	tristate "Smartisan TD4362 DSI panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y here if you want to enable support for the Smartisan TD4362
+	  1080x2242 command mode panel found in the Smartisan R1 (trident)
+	  smartphone. The panel is driven over four MIPI DSI lanes in
+	  command mode.
+
+	  If unsure, say N.
+
 config DRM_PANEL_SONY_ACX565AKM
 	tristate "Sony ACX565AKM panel"
 	depends on GPIOLIB && OF && SPI
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 4532f79021ea..bc4fad310554 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -112,6 +112,7 @@ obj-$(CONFIG_DRM_PANEL_SHARP_LS060T1SX01) += panel-sharp-ls060t1sx01.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7701) += panel-sitronix-st7701.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7703) += panel-sitronix-st7703.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
+obj-$(CONFIG_DRM_PANEL_SMARTISAN_TD4362) += panel-smartisan-td4362.o
 obj-$(CONFIG_DRM_PANEL_SUMMIT) += panel-summit.o
 obj-$(CONFIG_DRM_PANEL_SYNAPTICS_R63353) += panel-synaptics-r63353.o
 obj-$(CONFIG_DRM_PANEL_SYNAPTICS_TDDI) += panel-synaptics-tddi.o
diff --git a/drivers/gpu/drm/panel/panel-smartisan-td4362.c b/drivers/gpu/drm/panel/panel-smartisan-td4362.c
new file mode 100644
index 000000000000..7fb0ca43780d
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-smartisan-td4362.c
@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (c) 2026 Lu Chen <tianshi12127@gmail.com>
+// Generated with linux-mdss-dsi-panel-driver-generator from vendor device tree:
+//   Copyright (c) 2013, The Linux Foundation. All rights reserved.
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+
+struct smartisan_td4362 {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct regulator_bulk_data *supplies;
+	struct gpio_desc *reset_gpio;
+};
+
+static const struct regulator_bulk_data smartisan_td4362_supplies[] = {
+	{ .supply = "vddio" },
+	{ .supply = "vsp" },
+	{ .supply = "vsn" },
+};
+
+static inline struct smartisan_td4362 *to_smartisan_td4362(struct drm_panel *panel)
+{
+	return container_of(panel, struct smartisan_td4362, panel);
+}
+
+static void smartisan_td4362_reset(struct smartisan_td4362 *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 10100);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(10000, 10100);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 10100);
+}
+
+static int smartisan_td4362_on(struct smartisan_td4362 *ctx)
+{
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+
+	ctx->dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
+				     0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY,
+				     0x24);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_POWER_SAVE, 0x82);
+	mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	mipi_dsi_dcs_set_column_address_multi(&dsi_ctx, 0x0000, 0x0437);
+	mipi_dsi_dcs_set_page_address_multi(&dsi_ctx, 0x0000, 0x08c1);
+	mipi_dsi_dcs_set_tear_scanline_multi(&dsi_ctx, 0x07fa);
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 80);
+
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x04);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9,
+					 0x9b, 0x51, 0x07, 0xe6, 0x00, 0x10,
+					 0x00);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xba,
+					 0xbb, 0x2f, 0x1d, 0xbe, 0x00, 0x10,
+					 0x04);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xce,
+					 0x5d, 0x40, 0x60, 0x78, 0x87, 0x94,
+					 0x9e, 0xab, 0xb8, 0xc4, 0xcd, 0xd6,
+					 0xde, 0xe5, 0xec, 0xf3, 0xfd, 0xff,
+					 0x04, 0x28, 0x04, 0x04, 0x42, 0x00,
+					 0x69, 0x5a, 0x40, 0x01, 0xf4, 0x00,
+					 0x00, 0x04, 0xfa, 0x00);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xca,
+					 0x1d, 0xfc, 0xfc, 0xfc, 0x00, 0x07,
+					 0x07, 0x00, 0x00, 0x00, 0xeb, 0xe7,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+					 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf9, 0x64);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x03);
+
+	return dsi_ctx.accum_err;
+}
+
+static int smartisan_td4362_off(struct smartisan_td4362 *ctx)
+{
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+
+	ctx->dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_usleep_range(&dsi_ctx, 16000, 17000);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 64);
+
+	return dsi_ctx.accum_err;
+}
+
+static int smartisan_td4362_prepare(struct drm_panel *panel)
+{
+	struct smartisan_td4362 *ctx = to_smartisan_td4362(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(smartisan_td4362_supplies),
+				    ctx->supplies);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable regulators: %d\n", ret);
+		return ret;
+	}
+
+	msleep(100);
+
+	smartisan_td4362_reset(ctx);
+
+	ret = smartisan_td4362_on(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+		regulator_bulk_disable(ARRAY_SIZE(smartisan_td4362_supplies),
+				       ctx->supplies);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int smartisan_td4362_unprepare(struct drm_panel *panel)
+{
+	struct smartisan_td4362 *ctx = to_smartisan_td4362(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	ret = smartisan_td4362_off(ctx);
+	if (ret < 0)
+		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	regulator_bulk_disable(ARRAY_SIZE(smartisan_td4362_supplies),
+			       ctx->supplies);
+
+	return 0;
+}
+
+static const struct drm_display_mode smartisan_td4362_mode = {
+	.clock = (1080 + 44 + 2 + 60) * (2242 + 8 + 2 + 100) * 60 / 1000,
+	.hdisplay = 1080,
+	.hsync_start = 1080 + 44,
+	.hsync_end = 1080 + 44 + 2,
+	.htotal = 1080 + 44 + 2 + 60,
+	.vdisplay = 2242,
+	.vsync_start = 2242 + 8,
+	.vsync_end = 2242 + 8 + 2,
+	.vtotal = 2242 + 8 + 2 + 100,
+	.width_mm = 64,
+	.height_mm = 117,
+	.type = DRM_MODE_TYPE_DRIVER,
+};
+
+static int smartisan_td4362_get_modes(struct drm_panel *panel,
+				      struct drm_connector *connector)
+{
+	return drm_connector_helper_get_modes_fixed(connector,
+						    &smartisan_td4362_mode);
+}
+
+static const struct drm_panel_funcs smartisan_td4362_panel_funcs = {
+	.prepare = smartisan_td4362_prepare,
+	.unprepare = smartisan_td4362_unprepare,
+	.get_modes = smartisan_td4362_get_modes,
+};
+
+static int smartisan_td4362_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct smartisan_td4362 *ctx;
+	int ret;
+
+	ctx = devm_drm_panel_alloc(dev, struct smartisan_td4362, panel,
+				   &smartisan_td4362_panel_funcs,
+				   DRM_MODE_CONNECTOR_DSI);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
+
+	ret = devm_regulator_bulk_get_const(dev,
+					    ARRAY_SIZE(smartisan_td4362_supplies),
+					    smartisan_td4362_supplies,
+					    &ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	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_CLOCK_NON_CONTINUOUS;
+
+	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");
+
+	drm_panel_add(&ctx->panel);
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		drm_panel_remove(&ctx->panel);
+		return dev_err_probe(dev, ret, "Failed to attach to DSI host\n");
+	}
+
+	return 0;
+}
+
+static void smartisan_td4362_remove(struct mipi_dsi_device *dsi)
+{
+	struct smartisan_td4362 *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 smartisan_td4362_of_match[] = {
+	{ .compatible = "smartisan,td4362" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, smartisan_td4362_of_match);
+
+static struct mipi_dsi_driver smartisan_td4362_driver = {
+	.probe = smartisan_td4362_probe,
+	.remove = smartisan_td4362_remove,
+	.driver = {
+		.name = "panel-smartisan-td4362",
+		.of_match_table = smartisan_td4362_of_match,
+	},
+};
+module_mipi_dsi_driver(smartisan_td4362_driver);
+
+MODULE_AUTHOR("Lu Chen <tianshi12127@gmail.com>");
+MODULE_DESCRIPTION("DRM driver for Smartisan TD4362 1080p command mode DSI panel");
+MODULE_LICENSE("GPL");
-- 
2.56.0