[PATCH v3 3/4] drm: panel: Add driver for ClockworkPi cwd686 panel

Max Fierke
2022-09-18T03:44:52Z

The ClockworkPi DevTerm (all models) uses a 6.86" IPS display
of unknown provenance, which uses the Chipone ICNL9707 IC driver.

The display panel I have has two model numbers: TXW686001 and WTL068601G,
but cannot find any manufacturer associated with either, so opting for the
ClockworkPi model number.

This driver is based on the GPL-licensed driver released by ClockworkPi,
authored by Pinfan Zhu, with some additional cleanup, rotation support,
and display sleep re-enabling done by me.

Original driver here for reference: https://github.com/clockworkpi/DevTerm/blob/main/Code/patch/armbian_build_a06/patch/kernel-004-panel.patch
Display IC datasheet provided here: https://github.com/clockworkpi/DevTerm/blob/main/Schematics/ICNL9707_Datasheet.pdf

Signed-off-by: Max Fierke <max@maxfierke.com>
---
Changes in v3:
- no changes

Changes in v2: (Sam Ravnborg's suggestions)
- remove some unused properties from definition (e.g. enable_gpio, supply)
- add missing regulators
- reorder includes
- remove redundant ctx->backlight in favor of backlight through drm_panel_of_backlight
- remove now-unneeded ctx->enabled and enable/disable hooks
- replace ICNL9707_DCS macro with mipi_dsi_dcs_write_seq
- use dev_err_probe instead of checking EPROBE_DEFER
- fixed return type of cwd686_remove to be void following changes to mipi_dsi_driver

drivers/gpu/drm/panel/Kconfig | 12 +
drivers/gpu/drm/panel/Makefile | 1 +
.../gpu/drm/panel/panel-clockworkpi-cwd686.c | 445 ++++++++++++++++++
3 files changed, 458 insertions(+)
create mode 100644 drivers/gpu/drm/panel/panel-clockworkpi-cwd686.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index a582ddd583c2..e6b3d4f091f9 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -68,6 +68,18 @@ config DRM_PANEL_BOE_TV101WUM_NL6
Say Y here if you want to support for BOE TV101WUM and AUO KD101N80
45NA WUXGA PANEL DSI Video Mode panel

+config DRM_PANEL_CLOCKWORKPI_CWD686
+ tristate "ClockworkPi CWD686 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 ClockworkPi CWD686
+ ICNL9707-based panel, e.g. as used within the ClockworkPi DevTerm.
+ The panel has a 480x1280 resolution and uses 24 bit RGB per pixel.
+
+ To compile this driver as a module, choose M here.
+
config DRM_PANEL_DSI_CM
tristate "Generic DSI command mode panels"
depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 34e717382dbb..6c3ed2acaa6b 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_DRM_PANEL_ASUS_Z00T_TM5P5_NT35596) += panel-asus-z00t-tm5p5-n35596.
obj-$(CONFIG_DRM_PANEL_BOE_BF060Y8M_AJ0) += panel-boe-bf060y8m-aj0.o
obj-$(CONFIG_DRM_PANEL_BOE_HIMAX8279D) += panel-boe-himax8279d.o
obj-$(CONFIG_DRM_PANEL_BOE_TV101WUM_NL6) += panel-boe-tv101wum-nl6.o
+obj-$(CONFIG_DRM_PANEL_CLOCKWORKPI_CWD686) += panel-clockworkpi-cwd686.o
obj-$(CONFIG_DRM_PANEL_DSI_CM) += panel-dsi-cm.o
obj-$(CONFIG_DRM_PANEL_LVDS) += panel-lvds.o
obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
diff --git a/drivers/gpu/drm/panel/panel-clockworkpi-cwd686.c b/drivers/gpu/drm/panel/panel-clockworkpi-cwd686.c
new file mode 100644
index 000000000000..87d20d784596
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-clockworkpi-cwd686.c
@@ -0,0 +1,445 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2021 Clockwork Tech LLC
+ * Copyright (c) 2021-2022 Max Fierke <max@maxfierke.com>
+ *
+ * Based on Pinfan Zhu's work on panel-cwd686.c for ClockworkPi's 5.10 BSP
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+#include <linux/delay.h>
+#include <linux/of_device.h>
+#include <linux/module.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_modes.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+
+struct cwd686 {
+ struct device *dev;
+ struct drm_panel panel;
+ struct regulator *vci;
+ struct regulator *iovcc;
+ struct gpio_desc *reset_gpio;
+ enum drm_panel_orientation orientation;
+ bool prepared;
+};
+
+static const struct drm_display_mode default_mode = {
+ .clock = 54465,
+ .hdisplay = 480,
+ .hsync_start = 480 + 150,
+ .hsync_end = 480 + 150 + 24,
+ .htotal = 480 + 150 + 24 + 40,
+ .vdisplay = 1280,
+ .vsync_start = 1280 + 12,
+ .vsync_end = 1280 + 12 + 6,
+ .vtotal = 1280 + 12 + 6 + 10,
+};
+
+static inline struct cwd686 *panel_to_cwd686(struct drm_panel *panel)
+{
+ return container_of(panel, struct cwd686, panel);
+}
+
+#define ICNL9707_CMD_CGOUTL 0xB3
+#define ICNL9707_CMD_CGOUTR 0xB4
+#define ICNL9707_P_CGOUT_VGL 0x00
+#define ICNL9707_P_CGOUT_VGH 0x01
+#define ICNL9707_P_CGOUT_HZ 0x02
+#define ICNL9707_P_CGOUT_GND 0x03
+#define ICNL9707_P_CGOUT_GSP1 0x04
+#define ICNL9707_P_CGOUT_GSP2 0x05
+#define ICNL9707_P_CGOUT_GSP3 0x06
+#define ICNL9707_P_CGOUT_GSP4 0x07
+#define ICNL9707_P_CGOUT_GSP5 0x08
+#define ICNL9707_P_CGOUT_GSP6 0x09
+#define ICNL9707_P_CGOUT_GSP7 0x0A
+#define ICNL9707_P_CGOUT_GSP8 0x0B
+#define ICNL9707_P_CGOUT_GCK1 0x0C
+#define ICNL9707_P_CGOUT_GCK2 0x0D
+#define ICNL9707_P_CGOUT_GCK3 0x0E
+#define ICNL9707_P_CGOUT_GCK4 0x0F
+#define ICNL9707_P_CGOUT_GCK5 0x10
+#define ICNL9707_P_CGOUT_GCK6 0x11
+#define ICNL9707_P_CGOUT_GCK7 0x12
+#define ICNL9707_P_CGOUT_GCK8 0x13
+#define ICNL9707_P_CGOUT_GCK9 0x14
+#define ICNL9707_P_CGOUT_GCK10 0x15
+#define ICNL9707_P_CGOUT_GCK11 0x16
+#define ICNL9707_P_CGOUT_GCK12 0x17
+#define ICNL9707_P_CGOUT_GCK13 0x18
+#define ICNL9707_P_CGOUT_GCK14 0x19
+#define ICNL9707_P_CGOUT_GCK15 0x1A
+#define ICNL9707_P_CGOUT_GCK16 0x1B
+#define ICNL9707_P_CGOUT_DIR 0x1C
+#define ICNL9707_P_CGOUT_DIRB 0x1D
+#define ICNL9707_P_CGOUT_ECLK_AC 0x1E
+#define ICNL9707_P_CGOUT_ECLK_ACB 0x1F
+#define ICNL9707_P_CGOUT_ECLK_AC2 0x20
+#define ICNL9707_P_CGOUT_ECLK_AC2B 0x21
+#define ICNL9707_P_CGOUT_GCH 0x22
+#define ICNL9707_P_CGOUT_GCL 0x23
+#define ICNL9707_P_CGOUT_XDON 0x24
+#define ICNL9707_P_CGOUT_XDONB 0x25
+
+#define ICNL9707_MADCTL_ML 0x10
+#define ICNL9707_MADCTL_RGB 0x00
+#define ICNL9707_MADCTL_BGR 0x08
+#define ICNL9707_MADCTL_MH 0x04
+
+#define ICNL9707_CMD_PWRCON_VCOM 0xB6
+#define ICNL9707_P_PWRCON_VCOM_0495V 0x0D
+
+#define ICNL9707_CMD_PWRCON_SEQ 0xB7
+#define ICNL9707_CMD_PWRCON_CLK 0xB8
+#define ICNL9707_CMD_PWRCON_BTA 0xB9
+#define ICNL9707_CMD_PWRCON_MODE 0xBA
+#define ICNL9707_CMD_PWRCON_REG 0xBD
+
+#define ICNL9707_CMD_TCON 0xC1
+#define ICNL9707_CMD_TCON2 0xC2
+#define ICNL9707_CMD_TCON3 0xC3
+#define ICNL9707_CMD_SRC_TIM 0xC6
+#define ICNL9707_CMD_SRCCON 0xC7
+#define ICNL9707_CMD_SET_GAMMA 0xC8
+
+#define ICNL9707_CMD_ETC 0xD0
+
+#define ICNL9707_CMD_PASSWORD1 0xF0
+#define ICNL9707_P_PASSWORD1_DEFAULT 0xA5
+#define ICNL9707_P_PASSWORD1_ENABLE_LVL2 0x5A
+
+#define ICNL9707_CMD_PASSWORD2 0xF1
+#define ICNL9707_P_PASSWORD2_DEFAULT 0x5A
+#define ICNL9707_P_PASSWORD2_ENABLE_LVL2 0xA5
+
+static int cwd686_init_sequence(struct cwd686 *ctx)
+{
+ struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+ int err;
+
+ /* Enable access to Level 2 registers */
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_PASSWORD1,
+ ICNL9707_P_PASSWORD1_ENABLE_LVL2,
+ ICNL9707_P_PASSWORD1_ENABLE_LVL2);
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_PASSWORD2,
+ ICNL9707_P_PASSWORD2_ENABLE_LVL2,
+ ICNL9707_P_PASSWORD2_ENABLE_LVL2);
+
+ /* Set PWRCON_VCOM (-0.495V, -0.495V) */
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_PWRCON_VCOM,
+ ICNL9707_P_PWRCON_VCOM_0495V,
+ ICNL9707_P_PWRCON_VCOM_0495V);
+
+ /* Map ASG output signals */
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_CGOUTR,
+ ICNL9707_P_CGOUT_GSP7, ICNL9707_P_CGOUT_GSP5,
+ ICNL9707_P_CGOUT_GCK7, ICNL9707_P_CGOUT_GCK5,
+ ICNL9707_P_CGOUT_GCK3, ICNL9707_P_CGOUT_GCK1,
+ ICNL9707_P_CGOUT_VGL, ICNL9707_P_CGOUT_VGL,
+ ICNL9707_P_CGOUT_VGL, ICNL9707_P_CGOUT_GND,
+ ICNL9707_P_CGOUT_VGL, ICNL9707_P_CGOUT_GND,
+ ICNL9707_P_CGOUT_GND, ICNL9707_P_CGOUT_GND,
+ ICNL9707_P_CGOUT_GND, ICNL9707_P_CGOUT_GND,
+ ICNL9707_P_CGOUT_GND, ICNL9707_P_CGOUT_GND,
+ ICNL9707_P_CGOUT_GSP1, ICNL9707_P_CGOUT_GSP3);
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_CGOUTL,
+ ICNL9707_P_CGOUT_GSP8, ICNL9707_P_CGOUT_GSP6,
+ ICNL9707_P_CGOUT_GCK8, ICNL9707_P_CGOUT_GCK6,
+ ICNL9707_P_CGOUT_GCK4, ICNL9707_P_CGOUT_GCK2,
+ ICNL9707_P_CGOUT_VGL, ICNL9707_P_CGOUT_VGL,
+ ICNL9707_P_CGOUT_VGL, ICNL9707_P_CGOUT_GND,
+ ICNL9707_P_CGOUT_VGL, ICNL9707_P_CGOUT_GND,
+ ICNL9707_P_CGOUT_GND, ICNL9707_P_CGOUT_GND,
+ ICNL9707_P_CGOUT_GND, ICNL9707_P_CGOUT_GND,
+ ICNL9707_P_CGOUT_GND, ICNL9707_P_CGOUT_GND,
+ ICNL9707_P_CGOUT_GSP2, ICNL9707_P_CGOUT_GSP4);
+
+ /* Undocumented commands provided by the vendor */
+ mipi_dsi_dcs_write_seq(dsi, 0xB0, 0x54, 0x32, 0x23, 0x45, 0x44, 0x44, 0x44, 0x44, 0x90, 0x01, 0x90, 0x01);
+ mipi_dsi_dcs_write_seq(dsi, 0xB1, 0x32, 0x84, 0x02, 0x83, 0x30, 0x01, 0x6B, 0x01);
+ mipi_dsi_dcs_write_seq(dsi, 0xB2, 0x73);
+
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_PWRCON_REG,
+ 0x4E, 0x0E, 0x50, 0x50, 0x26,
+ 0x1D, 0x00, 0x14, 0x42, 0x03);
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_PWRCON_SEQ,
+ 0x01, 0x01, 0x09, 0x11, 0x0D, 0x55,
+ 0x19, 0x19, 0x21, 0x1D, 0x00, 0x00,
+ 0x00, 0x00, 0x02, 0xFF, 0x3C);
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_PWRCON_CLK, 0x23, 0x01, 0x30, 0x34, 0x63);
+
+ /* Disable abnormal power-off flag */
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_PWRCON_BTA, 0xA0, 0x22, 0x00, 0x44);
+
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_PWRCON_MODE, 0x12, 0x63);
+
+ /* Set VBP, VFP, VSW, HBP, HFP, HSW */
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_TCON, 0x0C, 0x16, 0x04, 0x0C, 0x10, 0x04);
+
+ /* Set resolution */
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_TCON2, 0x11, 0x41);
+
+ /* Set frame blanking */
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_TCON3, 0x22, 0x31, 0x04);
+
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_SRCCON, 0x05, 0x23, 0x6B, 0x49, 0x00);
+
+ /* Another undocumented command */
+ mipi_dsi_dcs_write_seq(dsi, 0xC5, 0x00);
+
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_ETC, 0x37, 0xFF, 0xFF);
+
+ /* Another set of undocumented commands */
+ mipi_dsi_dcs_write_seq(dsi, 0xD2, 0x63, 0x0B, 0x08, 0x88);
+ mipi_dsi_dcs_write_seq(dsi, 0xD3, 0x01, 0x00, 0x00, 0x01, 0x01, 0x37, 0x25, 0x38, 0x31, 0x06, 0x07);
+
+ /* Set Gamma to 2.2 */
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_SET_GAMMA,
+ 0x7C, 0x6A, 0x5D, 0x53, 0x53, 0x45, 0x4B,
+ 0x35, 0x4D, 0x4A, 0x49, 0x66, 0x53, 0x57,
+ 0x4A, 0x48, 0x3B, 0x2A, 0x06, 0x7C, 0x6A,
+ 0x5D, 0x53, 0x53, 0x45, 0x4B, 0x35, 0x4D,
+ 0x4A, 0x49, 0x66, 0x53, 0x57, 0x4A, 0x48,
+ 0x3B, 0x2A, 0x06);
+
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_SRC_TIM, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00);
+
+ /* Another undocumented command */
+ mipi_dsi_dcs_write_seq(dsi, 0xF4, 0x08, 0x77);
+
+ mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE,
+ ICNL9707_MADCTL_RGB | ICNL9707_MADCTL_ML | ICNL9707_MADCTL_MH);
+
+ /* Enable tearing mode at VBLANK */
+ err = mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+ if (err) {
+ dev_err(ctx->dev, "failed to enable vblank TE (%d)\n", err);
+ return err;
+ }
+
+ /* Disable access to Level 2 registers */
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_PASSWORD2,
+ ICNL9707_P_PASSWORD2_DEFAULT,
+ ICNL9707_P_PASSWORD2_DEFAULT);
+ mipi_dsi_dcs_write_seq(dsi, ICNL9707_CMD_PASSWORD1,
+ ICNL9707_P_PASSWORD1_DEFAULT,
+ ICNL9707_P_PASSWORD1_DEFAULT);
+
+ return 0;
+}
+
+static int cwd686_unprepare(struct drm_panel *panel)
+{
+ struct cwd686 *ctx = panel_to_cwd686(panel);
+ struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+ int err;
+
+ if (!ctx->prepared)
+ return 0;
+
+ err = mipi_dsi_dcs_set_display_off(dsi);
+ if (err) {
+ dev_err(ctx->dev, "failed to turn display off (%d)\n", err);
+ return err;
+ }
+
+ err = mipi_dsi_dcs_enter_sleep_mode(dsi);
+ if (err) {
+ dev_err(ctx->dev, "failed to enter sleep mode (%d)\n", err);
+ return err;
+ }
+
+ msleep(120);
+
+ gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+
+ regulator_disable(ctx->iovcc);
+ regulator_disable(ctx->vci);
+
+ ctx->prepared = false;
+
+ return 0;
+}
+
+static int cwd686_prepare(struct drm_panel *panel)
+{
+ struct cwd686 *ctx = panel_to_cwd686(panel);
+ struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+ int err;
+
+ if (ctx->prepared)
+ return 0;
+
+ err = regulator_enable(ctx->vci);
+ if (err < 0) {
+ dev_err(ctx->dev, "failed to enable vci supply: %d\n", err);
+ return err;
+ }
+ err = regulator_enable(ctx->iovcc);
+ if (err < 0) {
+ dev_err(ctx->dev, "failed to enable iovcc supply: %d\n", err);
+ goto disable_vci;
+ }
+
+ gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+ /* T2 */
+ msleep(10);
+
+ gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+ /* T3 */
+ msleep(20);
+
+ /* Exit sleep mode and power on */
+
+ err = cwd686_init_sequence(ctx);
+ if (err) {
+ dev_err(ctx->dev, "failed to initialize display (%d)\n", err);
+ goto disable_iovcc;
+ }
+
+ err = mipi_dsi_dcs_exit_sleep_mode(dsi);
+ if (err) {
+ dev_err(ctx->dev, "failed to exit sleep mode (%d)\n", err);
+ goto disable_iovcc;
+ }
+ /* T6 */
+ msleep(120);
+
+ err = mipi_dsi_dcs_set_display_on(dsi);
+ if (err) {
+ dev_err(ctx->dev, "failed to turn display on (%d)\n", err);
+ goto disable_iovcc;
+ }
+ msleep(20);
+
+ ctx->prepared = true;
+
+ return 0;
+disable_iovcc:
+ regulator_disable(ctx->iovcc);
+disable_vci:
+ regulator_disable(ctx->vci);
+ return err;
+}
+
+static int cwd686_get_modes(struct drm_panel *panel, struct drm_connector *connector)
+{
+ struct cwd686 *ctx = panel_to_cwd686(panel);
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(connector->dev, &default_mode);
+ if (!mode) {
+ dev_err(panel->dev, "bad mode or failed to add mode\n");
+ return -EINVAL;
+ }
+ drm_mode_set_name(mode);
+ mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+
+ /* Set up connector's "panel orientation" property */
+ drm_connector_set_panel_orientation(connector, ctx->orientation);
+
+ drm_mode_probed_add(connector, mode);
+
+ return 1; /* Number of modes */
+}
+
+static const struct drm_panel_funcs cwd686_drm_funcs = {
+ .unprepare = cwd686_unprepare,
+ .prepare = cwd686_prepare,
+ .get_modes = cwd686_get_modes,
+};
+
+static int cwd686_probe(struct mipi_dsi_device *dsi)
+{
+ struct device *dev = &dsi->dev;
+ struct cwd686 *ctx;
+ int err;
+
+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ mipi_dsi_set_drvdata(dsi, ctx);
+ ctx->dev = dev;
+
+ dsi->lanes = 4;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+ MIPI_DSI_MODE_VIDEO_BURST |
+ MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+
+ ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(ctx->reset_gpio)) {
+ err = PTR_ERR(ctx->reset_gpio);
+ return dev_err_probe(dev, err, "Failed to request GPIO (%d)\n", err);
+ }
+
+ ctx->vci = devm_regulator_get(dev, "vci");
+ if (IS_ERR(ctx->vci)) {
+ err = PTR_ERR(ctx->vci);
+ return dev_err_probe(dev, err, "Failed to request vci regulator: %d\n", err);
+ }
+
+ ctx->iovcc = devm_regulator_get(dev, "iovcc");
+ if (IS_ERR(ctx->iovcc)) {
+ err = PTR_ERR(ctx->iovcc);
+ return dev_err_probe(dev, err, "Failed to request iovcc regulator: %d\n", err);
+ }
+
+ err = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
+ if (err) {
+ dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, err);
+ return err;
+ }
+
+ drm_panel_init(&ctx->panel, dev, &cwd686_drm_funcs, DRM_MODE_CONNECTOR_DSI);
+
+ err = drm_panel_of_backlight(&ctx->panel);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to get backlight\n");
+
+ drm_panel_add(&ctx->panel);
+
+ err = mipi_dsi_attach(dsi);
+ if (err < 0) {
+ dev_err(dev, "mipi_dsi_attach() failed: %d\n", err);
+ drm_panel_remove(&ctx->panel);
+ return err;
+ }
+
+ return 0;
+}
+
+static void cwd686_remove(struct mipi_dsi_device *dsi)
+{
+ struct cwd686 *ctx = mipi_dsi_get_drvdata(dsi);
+
+ mipi_dsi_detach(dsi);
+ drm_panel_remove(&ctx->panel);
+}
+
+static const struct of_device_id cwd686_of_match[] = {
+ { .compatible = "clockworkpi,cwd686" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, cwd686_of_match);
+
+static struct mipi_dsi_driver cwd686_driver = {
+ .probe = cwd686_probe,
+ .remove = cwd686_remove,
+ .driver = {
+ .name = "panel-clockworkpi-cwd686",
+ .of_match_table = cwd686_of_match,
+ },
+};
+module_mipi_dsi_driver(cwd686_driver);
+
+MODULE_AUTHOR("Pinfan Zhu <zhu@clockworkpi.com>");
+MODULE_AUTHOR("Max Fierke <max@maxfierke.com>");
+MODULE_DESCRIPTION("ClockworkPi CWD686 panel driver");
+MODULE_LICENSE("GPL");
--
2.37.2