ST7701 designed for small and medium sizes of TFT LCD display, is
capable of supporting up to 480RGBX864 in resolution. It provides
several system interfaces like MIPI/RGB/SPI.

Currently added support for Techstar TS8550B which is ST7701 based
480x854, 2-lane MIPI DSI LCD panel.

Driver now registering mipi_dsi device, but indeed it can extendable
for RGB if any requirement trigger in future.

Signed-off-by: Jagan Teki <ja...@amarulasolutions.com>
Reviewed-by: Sam Ravnborg <s...@ravnborg.org>
---
Changes for v9:
- drop drmP.h header
- order include files
- drop backlight put_device from remove()
- collect Sam Ravnborg Reviewed-by
Changes for v8:
- use DRM_DEV_ERROR instead of dev_err
- use devm_of_find_backlight() instead of of_parse_phandle()
- remove unneeded 'num_supplies' from struct st7701
- add proper comments about panel sepecific sleep mode delay as
  per st7701 datasheet
- update msleep delay values in .prepare as per datasheet and as per
  discussion in v7, thanks to 'Sam Ravnborg' 
- update msleep delay values in .unprepare as per datasheet and as per
  discussion in v7, thanks to 'Sam Ravnborg'
- add proper comments on msleep delay values as per st7701 datasheet
- use MIPI_DCS_ENTER_SLEEP_MODE in .unprepare
- drop unneeded gpio set in .prepare and .unprepare as per panel-simple
- remove unneeded include files
- rebase on master
Changes for v7:
- rebase on master
Changes for v6:
- use sleep delay value as per datasheet
- add panel_sleep_delay variable for panel specific delay
- use command sequnce display on and off instead panel
  functions
- add proper comments on the delays
- remove delays from command switch
- move mode type on struct display mode
- drop refresh rate value, let drm compute 
Changes for v5:
- found the chip from vendor, so added new panel driver
- here is v4: https://patchwork.kernel.org/patch/10680335/

 MAINTAINERS                                   |   6 +
 drivers/gpu/drm/panel/Kconfig                 |  10 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-sitronix-st7701.c | 426 ++++++++++++++++++
 4 files changed, 443 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-sitronix-st7701.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 5c8591eb5840..875bba40157b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4937,6 +4937,12 @@ S:       Orphan / Obsolete
 F:     drivers/gpu/drm/sis/
 F:     include/uapi/drm/sis_drm.h
 
+DRM DRIVER FOR SITRONIX ST7701 PANELS
+M:     Jagan Teki <ja...@amarulasolutions.com>
+S:     Maintained
+F:     drivers/gpu/drm/panel/panel-sitronix-st7701.c
+F:     Documentation/devicetree/bindings/display/panel/sitronix,st7701.txt
+
 DRM DRIVER FOR SITRONIX ST7586 PANELS
 M:     David Lechner <da...@lechnology.com>
 S:     Maintained
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 5304db7b7b55..a65b3a065598 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -214,6 +214,16 @@ config DRM_PANEL_SHARP_LS043T1LE01
          Say Y here if you want to enable support for Sharp LS043T1LE01 qHD
          (540x960) DSI panel as found on the Qualcomm APQ8074 Dragonboard
 
+config DRM_PANEL_SITRONIX_ST7701
+       tristate "Sitronix ST7701 panel driver"
+       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 Sitronix
+         ST7701 controller for 480X864 LCD panels with MIPI/RGB/SPI
+         system interfaces.
+
 config DRM_PANEL_SITRONIX_ST7789V
        tristate "Sitronix ST7789V panel"
        depends on OF && SPI
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index c88dacf9d439..0ec4c41915dd 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += 
panel-samsung-s6e8aa0.o
 obj-$(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-$(CONFIG_DRM_PANEL_SITRONIX_ST7701) += panel-sitronix-st7701.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
 obj-$(CONFIG_DRM_PANEL_TPO_TPG110) += panel-tpo-tpg110.o
 obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o
diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7701.c 
b/drivers/gpu/drm/panel/panel-sitronix-st7701.c
new file mode 100644
index 000000000000..63f9a1c7fb1b
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7701.c
@@ -0,0 +1,426 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019, Amarula Solutions.
+ * Author: Jagan Teki <ja...@amarulasolutions.com>
+ */
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+#include <linux/backlight.h>
+#include <linux/gpio/consumer.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regulator/consumer.h>
+
+#include <video/mipi_display.h>
+
+/* Command2 BKx selection command */
+#define DSI_CMD2BKX_SEL                        0xFF
+
+/* Command2, BK0 commands */
+#define DSI_CMD2_BK0_PVGAMCTRL         0xB0 /* Positive Voltage Gamma Control 
*/
+#define DSI_CMD2_BK0_NVGAMCTRL         0xB1 /* Negative Voltage Gamma Control 
*/
+#define DSI_CMD2_BK0_LNESET            0xC0 /* Display Line setting */
+#define DSI_CMD2_BK0_PORCTRL           0xC1 /* Porch control */
+#define DSI_CMD2_BK0_INVSEL            0xC2 /* Inversion selection, Frame Rate 
Control */
+
+/* Command2, BK1 commands */
+#define DSI_CMD2_BK1_VRHS              0xB0 /* Vop amplitude setting */
+#define DSI_CMD2_BK1_VCOM              0xB1 /* VCOM amplitude setting */
+#define DSI_CMD2_BK1_VGHSS             0xB2 /* VGH Voltage setting */
+#define DSI_CMD2_BK1_TESTCMD           0xB3 /* TEST Command Setting */
+#define DSI_CMD2_BK1_VGLS              0xB5 /* VGL Voltage setting */
+#define DSI_CMD2_BK1_PWCTLR1           0xB7 /* Power Control 1 */
+#define DSI_CMD2_BK1_PWCTLR2           0xB8 /* Power Control 2 */
+#define DSI_CMD2_BK1_SPD1              0xC1 /* Source pre_drive timing set1 */
+#define DSI_CMD2_BK1_SPD2              0xC2 /* Source EQ2 Setting */
+#define DSI_CMD2_BK1_MIPISET1          0xD0 /* MIPI Setting 1 */
+
+/**
+ * Command2 with BK function selection.
+ *
+ * BIT[4, 0]: [CN2, BKXSEL]
+ * 10 = CMD2BK0, Command2 BK0
+ * 11 = CMD2BK1, Command2 BK1
+ * 00 = Command2 disable
+ */
+#define DSI_CMD2BK1_SEL                        0x11
+#define DSI_CMD2BK0_SEL                        0x10
+#define DSI_CMD2BKX_SEL_NONE           0x00
+
+/* Command2, BK0 bytes */
+#define DSI_LINESET_LINE               0x69
+#define DSI_LINESET_LDE_EN             BIT(7)
+#define DSI_LINESET_LINEDELTA          GENMASK(1, 0)
+#define DSI_CMD2_BK0_LNESET_B1         DSI_LINESET_LINEDELTA
+#define DSI_CMD2_BK0_LNESET_B0         (DSI_LINESET_LDE_EN | DSI_LINESET_LINE)
+#define DSI_INVSEL_DEFAULT             GENMASK(5, 4)
+#define DSI_INVSEL_NLINV               GENMASK(2, 0)
+#define DSI_INVSEL_RTNI                        GENMASK(2, 1)
+#define DSI_CMD2_BK0_INVSEL_B1         DSI_INVSEL_RTNI
+#define DSI_CMD2_BK0_INVSEL_B0         (DSI_INVSEL_DEFAULT | DSI_INVSEL_NLINV)
+#define DSI_CMD2_BK0_PORCTRL_B0(m)     ((m)->vtotal - (m)->vsync_end)
+#define DSI_CMD2_BK0_PORCTRL_B1(m)     ((m)->vsync_start - (m)->vdisplay)
+
+/* Command2, BK1 bytes */
+#define DSI_CMD2_BK1_VRHA_SET          0x45
+#define DSI_CMD2_BK1_VCOM_SET          0x13
+#define DSI_CMD2_BK1_VGHSS_SET         GENMASK(2, 0)
+#define DSI_CMD2_BK1_TESTCMD_VAL       BIT(7)
+#define DSI_VGLS_DEFAULT               BIT(6)
+#define DSI_VGLS_SEL                   GENMASK(2, 0)
+#define DSI_CMD2_BK1_VGLS_SET          (DSI_VGLS_DEFAULT | DSI_VGLS_SEL)
+#define DSI_PWCTLR1_AP                 BIT(7) /* Gamma OP bias, max */
+#define DSI_PWCTLR1_APIS               BIT(2) /* Source OP input bias, min */
+#define DSI_PWCTLR1_APOS               BIT(0) /* Source OP output bias, min */
+#define DSI_CMD2_BK1_PWCTLR1_SET       (DSI_PWCTLR1_AP | DSI_PWCTLR1_APIS | \
+                                       DSI_PWCTLR1_APOS)
+#define DSI_PWCTLR2_AVDD               BIT(5) /* AVDD 6.6v */
+#define DSI_PWCTLR2_AVCL               0x0    /* AVCL -4.4v */
+#define DSI_CMD2_BK1_PWCTLR2_SET       (DSI_PWCTLR2_AVDD | DSI_PWCTLR2_AVCL)
+#define DSI_SPD1_T2D                   BIT(3)
+#define DSI_CMD2_BK1_SPD1_SET          (GENMASK(6, 4) | DSI_SPD1_T2D)
+#define DSI_CMD2_BK1_SPD2_SET          DSI_CMD2_BK1_SPD1_SET
+#define DSI_MIPISET1_EOT_EN            BIT(3)
+#define DSI_CMD2_BK1_MIPISET1_SET      (BIT(7) | DSI_MIPISET1_EOT_EN)
+
+struct st7701_panel_desc {
+       const struct drm_display_mode *mode;
+       unsigned int lanes;
+       unsigned long flags;
+       enum mipi_dsi_pixel_format format;
+       const char *const *supply_names;
+       unsigned int num_supplies;
+       unsigned int panel_sleep_delay;
+};
+
+struct st7701 {
+       struct drm_panel panel;
+       struct mipi_dsi_device *dsi;
+       const struct st7701_panel_desc *desc;
+
+       struct backlight_device *backlight;
+       struct regulator_bulk_data *supplies;
+       struct gpio_desc *reset;
+       unsigned int sleep_delay;
+};
+
+static inline struct st7701 *panel_to_st7701(struct drm_panel *panel)
+{
+       return container_of(panel, struct st7701, panel);
+}
+
+static inline int st7701_dsi_write(struct st7701 *st7701, const void *seq,
+                                  size_t len)
+{
+       return mipi_dsi_dcs_write_buffer(st7701->dsi, seq, len);
+}
+
+#define ST7701_DSI(st7701, seq...)                             \
+       {                                                       \
+               const u8 d[] = { seq };                         \
+               st7701_dsi_write(st7701, d, ARRAY_SIZE(d));     \
+       }
+
+static void st7701_init_sequence(struct st7701 *st7701)
+{
+       const struct drm_display_mode *mode = st7701->desc->mode;
+
+       ST7701_DSI(st7701, MIPI_DCS_SOFT_RESET, 0x00);
+
+       /* We need to wait 5ms before sending new commands */
+       msleep(5);
+
+       ST7701_DSI(st7701, MIPI_DCS_EXIT_SLEEP_MODE, 0x00);
+
+       msleep(st7701->sleep_delay);
+
+       /* Command2, BK0 */
+       ST7701_DSI(st7701, DSI_CMD2BKX_SEL,
+                  0x77, 0x01, 0x00, 0x00, DSI_CMD2BK0_SEL);
+       ST7701_DSI(st7701, DSI_CMD2_BK0_PVGAMCTRL, 0x00, 0x0E, 0x15, 0x0F,
+                  0x11, 0x08, 0x08, 0x08, 0x08, 0x23, 0x04, 0x13, 0x12,
+                  0x2B, 0x34, 0x1F);
+       ST7701_DSI(st7701, DSI_CMD2_BK0_NVGAMCTRL, 0x00, 0x0E, 0x95, 0x0F,
+                  0x13, 0x07, 0x09, 0x08, 0x08, 0x22, 0x04, 0x10, 0x0E,
+                  0x2C, 0x34, 0x1F);
+       ST7701_DSI(st7701, DSI_CMD2_BK0_LNESET,
+                  DSI_CMD2_BK0_LNESET_B0, DSI_CMD2_BK0_LNESET_B1);
+       ST7701_DSI(st7701, DSI_CMD2_BK0_PORCTRL,
+                  DSI_CMD2_BK0_PORCTRL_B0(mode),
+                  DSI_CMD2_BK0_PORCTRL_B1(mode));
+       ST7701_DSI(st7701, DSI_CMD2_BK0_INVSEL,
+                  DSI_CMD2_BK0_INVSEL_B0, DSI_CMD2_BK0_INVSEL_B1);
+
+       /* Command2, BK1 */
+       ST7701_DSI(st7701, DSI_CMD2BKX_SEL,
+                       0x77, 0x01, 0x00, 0x00, DSI_CMD2BK1_SEL);
+       ST7701_DSI(st7701, DSI_CMD2_BK1_VRHS, DSI_CMD2_BK1_VRHA_SET);
+       ST7701_DSI(st7701, DSI_CMD2_BK1_VCOM, DSI_CMD2_BK1_VCOM_SET);
+       ST7701_DSI(st7701, DSI_CMD2_BK1_VGHSS, DSI_CMD2_BK1_VGHSS_SET);
+       ST7701_DSI(st7701, DSI_CMD2_BK1_TESTCMD, DSI_CMD2_BK1_TESTCMD_VAL);
+       ST7701_DSI(st7701, DSI_CMD2_BK1_VGLS, DSI_CMD2_BK1_VGLS_SET);
+       ST7701_DSI(st7701, DSI_CMD2_BK1_PWCTLR1, DSI_CMD2_BK1_PWCTLR1_SET);
+       ST7701_DSI(st7701, DSI_CMD2_BK1_PWCTLR2, DSI_CMD2_BK1_PWCTLR2_SET);
+       ST7701_DSI(st7701, DSI_CMD2_BK1_SPD1, DSI_CMD2_BK1_SPD1_SET);
+       ST7701_DSI(st7701, DSI_CMD2_BK1_SPD2, DSI_CMD2_BK1_SPD2_SET);
+       ST7701_DSI(st7701, DSI_CMD2_BK1_MIPISET1, DSI_CMD2_BK1_MIPISET1_SET);
+
+       /**
+        * ST7701_SPEC_V1.2 is unable to provide enough information above this
+        * specific command sequence, so grab the same from vendor BSP driver.
+        */
+       ST7701_DSI(st7701, 0xE0, 0x00, 0x00, 0x02);
+       ST7701_DSI(st7701, 0xE1, 0x0B, 0x00, 0x0D, 0x00, 0x0C, 0x00, 0x0E,
+                  0x00, 0x00, 0x44, 0x44);
+       ST7701_DSI(st7701, 0xE2, 0x33, 0x33, 0x44, 0x44, 0x64, 0x00, 0x66,
+                  0x00, 0x65, 0x00, 0x67, 0x00, 0x00);
+       ST7701_DSI(st7701, 0xE3, 0x00, 0x00, 0x33, 0x33);
+       ST7701_DSI(st7701, 0xE4, 0x44, 0x44);
+       ST7701_DSI(st7701, 0xE5, 0x0C, 0x78, 0x3C, 0xA0, 0x0E, 0x78, 0x3C,
+                  0xA0, 0x10, 0x78, 0x3C, 0xA0, 0x12, 0x78, 0x3C, 0xA0);
+       ST7701_DSI(st7701, 0xE6, 0x00, 0x00, 0x33, 0x33);
+       ST7701_DSI(st7701, 0xE7, 0x44, 0x44);
+       ST7701_DSI(st7701, 0xE8, 0x0D, 0x78, 0x3C, 0xA0, 0x0F, 0x78, 0x3C,
+                  0xA0, 0x11, 0x78, 0x3C, 0xA0, 0x13, 0x78, 0x3C, 0xA0);
+       ST7701_DSI(st7701, 0xEB, 0x02, 0x02, 0x39, 0x39, 0xEE, 0x44, 0x00);
+       ST7701_DSI(st7701, 0xEC, 0x00, 0x00);
+       ST7701_DSI(st7701, 0xED, 0xFF, 0xF1, 0x04, 0x56, 0x72, 0x3F, 0xFF,
+                  0xFF, 0xFF, 0xFF, 0xF3, 0x27, 0x65, 0x40, 0x1F, 0xFF);
+
+       /* disable Command2 */
+       ST7701_DSI(st7701, DSI_CMD2BKX_SEL,
+                  0x77, 0x01, 0x00, 0x00, DSI_CMD2BKX_SEL_NONE);
+}
+
+static int st7701_prepare(struct drm_panel *panel)
+{
+       struct st7701 *st7701 = panel_to_st7701(panel);
+       int ret;
+
+       gpiod_set_value(st7701->reset, 0);
+
+       ret = regulator_bulk_enable(st7701->desc->num_supplies,
+                                   st7701->supplies);
+       if (ret < 0)
+               return ret;
+       msleep(20);
+
+       gpiod_set_value(st7701->reset, 1);
+       msleep(150);
+
+       st7701_init_sequence(st7701);
+
+       return 0;
+}
+
+static int st7701_enable(struct drm_panel *panel)
+{
+       struct st7701 *st7701 = panel_to_st7701(panel);
+
+       ST7701_DSI(st7701, MIPI_DCS_SET_DISPLAY_ON, 0x00);
+       backlight_enable(st7701->backlight);
+
+       return 0;
+}
+
+static int st7701_disable(struct drm_panel *panel)
+{
+       struct st7701 *st7701 = panel_to_st7701(panel);
+
+       backlight_disable(st7701->backlight);
+       ST7701_DSI(st7701, MIPI_DCS_SET_DISPLAY_OFF, 0x00);
+
+       return 0;
+}
+
+static int st7701_unprepare(struct drm_panel *panel)
+{
+       struct st7701 *st7701 = panel_to_st7701(panel);
+
+       ST7701_DSI(st7701, MIPI_DCS_ENTER_SLEEP_MODE, 0x00);
+
+       msleep(st7701->sleep_delay);
+
+       gpiod_set_value(st7701->reset, 0);
+
+       /**
+        * During the Resetting period, the display will be blanked
+        * (The display is entering blanking sequence, which maximum
+        * time is 120 ms, when Reset Starts in Sleep Out –mode. The
+        * display remains the blank state in Sleep In –mode.) and
+        * then return to Default condition for Hardware Reset.
+        *
+        * So we need wait sleep_delay time to make sure reset completed.
+        */
+       msleep(st7701->sleep_delay);
+
+       regulator_bulk_disable(st7701->desc->num_supplies, st7701->supplies);
+
+       return 0;
+}
+
+static int st7701_get_modes(struct drm_panel *panel)
+{
+       struct st7701 *st7701 = panel_to_st7701(panel);
+       const struct drm_display_mode *desc_mode = st7701->desc->mode;
+       struct drm_display_mode *mode;
+
+       mode = drm_mode_duplicate(panel->drm, desc_mode);
+       if (!mode) {
+               DRM_DEV_ERROR(&st7701->dsi->dev,
+                             "failed to add mode %ux%ux@%u\n",
+                             desc_mode->hdisplay, desc_mode->vdisplay,
+                             desc_mode->vrefresh);
+               return -ENOMEM;
+       }
+
+       drm_mode_set_name(mode);
+       drm_mode_probed_add(panel->connector, mode);
+
+       panel->connector->display_info.width_mm = desc_mode->width_mm;
+       panel->connector->display_info.height_mm = desc_mode->height_mm;
+
+       return 1;
+}
+
+static const struct drm_panel_funcs st7701_funcs = {
+       .disable        = st7701_disable,
+       .unprepare      = st7701_unprepare,
+       .prepare        = st7701_prepare,
+       .enable         = st7701_enable,
+       .get_modes      = st7701_get_modes,
+};
+
+static const struct drm_display_mode ts8550b_mode = {
+       .clock          = 27500,
+
+       .hdisplay       = 480,
+       .hsync_start    = 480 + 38,
+       .hsync_end      = 480 + 38 + 12,
+       .htotal         = 480 + 38 + 12 + 12,
+
+       .vdisplay       = 854,
+       .vsync_start    = 854 + 4,
+       .vsync_end      = 854 + 4 + 8,
+       .vtotal         = 854 + 4 + 8 + 18,
+
+       .width_mm       = 69,
+       .height_mm      = 139,
+
+       .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
+static const char * const ts8550b_supply_names[] = {
+       "VCC",
+       "IOVCC",
+};
+
+static const struct st7701_panel_desc ts8550b_desc = {
+       .mode = &ts8550b_mode,
+       .lanes = 2,
+       .flags = MIPI_DSI_MODE_VIDEO,
+       .format = MIPI_DSI_FMT_RGB888,
+       .supply_names = ts8550b_supply_names,
+       .num_supplies = ARRAY_SIZE(ts8550b_supply_names),
+       .panel_sleep_delay = 80, /* panel need extra 80ms for sleep out cmd */
+};
+
+static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
+{
+       const struct st7701_panel_desc *desc;
+       struct st7701 *st7701;
+       int ret, i;
+
+       st7701 = devm_kzalloc(&dsi->dev, sizeof(*st7701), GFP_KERNEL);
+       if (!st7701)
+               return -ENOMEM;
+
+       desc = of_device_get_match_data(&dsi->dev);
+       dsi->mode_flags = desc->flags;
+       dsi->format = desc->format;
+       dsi->lanes = desc->lanes;
+
+       st7701->supplies = devm_kcalloc(&dsi->dev, desc->num_supplies,
+                                       sizeof(*st7701->supplies),
+                                       GFP_KERNEL);
+       if (!st7701->supplies)
+               return -ENOMEM;
+
+       for (i = 0; i < desc->num_supplies; i++)
+               st7701->supplies[i].supply = desc->supply_names[i];
+
+       ret = devm_regulator_bulk_get(&dsi->dev, desc->num_supplies,
+                                     st7701->supplies);
+       if (ret < 0)
+               return ret;
+
+       st7701->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
+       if (IS_ERR(st7701->reset)) {
+               DRM_DEV_ERROR(&dsi->dev, "Couldn't get our reset GPIO\n");
+               return PTR_ERR(st7701->reset);
+       }
+
+       st7701->backlight = devm_of_find_backlight(&dsi->dev);
+       if (IS_ERR(st7701->backlight))
+               return PTR_ERR(st7701->backlight);
+
+       drm_panel_init(&st7701->panel);
+
+       /**
+        * Once sleep out has been issued, ST7701 IC required to wait 120ms
+        * before initiating new commands.
+        *
+        * On top of that some panels might need an extra delay to wait, so
+        * add panel specific delay for those cases. As now this panel specific
+        * delay information is referenced from those panel BSP driver, example
+        * ts8550b and there is no valid documentation for that.
+        */
+       st7701->sleep_delay = 120 + desc->panel_sleep_delay;
+       st7701->panel.funcs = &st7701_funcs;
+       st7701->panel.dev = &dsi->dev;
+
+       ret = drm_panel_add(&st7701->panel);
+       if (ret < 0)
+               return ret;
+
+       mipi_dsi_set_drvdata(dsi, st7701);
+       st7701->dsi = dsi;
+       st7701->desc = desc;
+
+       return mipi_dsi_attach(dsi);
+}
+
+static int st7701_dsi_remove(struct mipi_dsi_device *dsi)
+{
+       struct st7701 *st7701 = mipi_dsi_get_drvdata(dsi);
+
+       mipi_dsi_detach(dsi);
+       drm_panel_remove(&st7701->panel);
+
+       return 0;
+}
+
+static const struct of_device_id st7701_of_match[] = {
+       { .compatible = "techstar,ts8550b", .data = &ts8550b_desc },
+       { }
+};
+MODULE_DEVICE_TABLE(of, st7701_of_match);
+
+static struct mipi_dsi_driver st7701_dsi_driver = {
+       .probe          = st7701_dsi_probe,
+       .remove         = st7701_dsi_remove,
+       .driver = {
+               .name           = "st7701",
+               .of_match_table = st7701_of_match,
+       },
+};
+module_mipi_dsi_driver(st7701_dsi_driver);
+
+MODULE_AUTHOR("Jagan Teki <ja...@amarulasolutions.com>");
+MODULE_DESCRIPTION("Sitronix ST7701 LCD Panel Driver");
+MODULE_LICENSE("GPL");
-- 
2.18.0.321.gffc6fa0e3

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