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Subject[PATCH v3 2/2] drm/panel: Add driver for Samsung S6E63M0 panel
Date
This patch adds Samsung S6E63M0 AMOLED LCD panel driver, connected over
spi. It's based on already removed, non dt s6e63m0 driver and
panel-samsung-ld9040. It can be found for example in some of Samsung
Aries based phones.

Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
---
Changes from v2:
- VIDEOMODE_HELPERS is not needed in Kconfig
- Added help text to Kconfig
- Remove unneeded videomode includes/fields
- Add sentinel comment in s6e63m0_of_match struct
- Handle errors during registration of backlight device. We shouldn't
register panel if we fail to register backlight device
- Added Reviewed-by

Changes from v1:
- Correct order of Kconfig/Makefile entry
- Fix SPDX tag, so it matches value of MODULE_LICENSE
- Remove inclusion of drmP.h
- Fix code formatting
- Use DRM_DEV_ERROR/DEBUG
- Extract hardcoded values
- Remove possibility to change gamma through sysfs, leaving only one
gamma table values
- Fix reset_gpio handling, so it'll be asserted in power_on and
deasserted in power_off. Also do it before turning voltage on.
- Disable backlight and enter sleep mode in disable callback.
Previously it was done in unprepare
- Enable display and backlight in enable callback. Previously it was
done in prepare
- Hardcode display timings and delays. Previously they were readed
from device tree
- We're using SPDX, so we don't need to have license body
- Use MIPI_DCS_EXIT_SLEEP_MODE and MIPI_DCS_SET_DISPLAY_ON
- Rename MAX_GAMMA_LEVEL to NUM_GAMMA_LEVELS
- Ommit get_brightness callback
- Use backlight_enable/disable API, like it's done in other panel
drivers (for example panel-simple)
- Make set_brightness called only from backlight api, like it's done
in other panel drivers (for example panel-simple).
- Reset gpio should be set to GPIOD_OUT_HIGH. It's declared as active
low in device tree
- Don't call power_off in remove callback
---
drivers/gpu/drm/panel/Kconfig | 9 +
drivers/gpu/drm/panel/Makefile | 1 +
drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 517 ++++++++++++++++++
3 files changed, 527 insertions(+)
create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e63m0.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 3f3537719beb..45e9ab4b7857 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -158,6 +158,15 @@ config DRM_PANEL_SAMSUNG_S6E63J0X03
depends on BACKLIGHT_CLASS_DEVICE
select VIDEOMODE_HELPERS

+config DRM_PANEL_SAMSUNG_S6E63M0
+ tristate "Samsung S6E63M0 RGB/SPI panel"
+ depends on OF
+ depends on SPI
+ depends on BACKLIGHT_CLASS_DEVICE
+ help
+ Say Y here if you want to enable support for Samsung s6e63m0
+ AMOLED LCD panel.
+
config DRM_PANEL_SAMSUNG_S6E8AA0
tristate "Samsung S6E8AA0 DSI video mode panel"
depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 4396658a7996..4507a2d253ac 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
+obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0) += panel-samsung-s6e63m0.o
obj-$(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
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
new file mode 100644
index 000000000000..4312aa3e4386
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
@@ -0,0 +1,517 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * S6E63M0 AMOLED LCD drm_panel driver.
+ *
+ * Copyright (C) 2019 Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
+ * Derived from drivers/gpu/drm/panel-samsung-ld9040.c
+ *
+ * Andrzej Hajda <a.hajda@samsung.com>
+ */
+
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <video/mipi_display.h>
+
+/* Manufacturer Command Set */
+#define MCS_ELVSS_ON 0xb1
+#define MCS_ACL_CTRL 0xc0
+#define MCS_DISPLAY_CONDITION 0xf2
+#define MCS_ETC_CONDITION 0xf6
+#define MCS_PANEL_CONDITION 0xF8
+#define MCS_GAMMA_CTRL 0xfa
+
+#define NUM_GAMMA_LEVELS 11
+#define GAMMA_TABLE_COUNT 23
+
+#define DATA_MASK 0x100
+
+#define MAX_BRIGHTNESS (NUM_GAMMA_LEVELS - 1)
+
+/* array of gamma tables for gamma value 2.2 */
+static u8 const s6e63m0_gamma_22[NUM_GAMMA_LEVELS][GAMMA_TABLE_COUNT] = {
+ { MCS_GAMMA_CTRL, 0x00,
+ 0x18, 0x08, 0x24, 0x78, 0xEC, 0x3D, 0xC8,
+ 0xC2, 0xB6, 0xC4, 0xC7, 0xB6, 0xD5, 0xD7,
+ 0xCC, 0x00, 0x39, 0x00, 0x36, 0x00, 0x51 },
+ { MCS_GAMMA_CTRL, 0x00,
+ 0x18, 0x08, 0x24, 0x73, 0x4A, 0x3D, 0xC0,
+ 0xC2, 0xB1, 0xBB, 0xBE, 0xAC, 0xCE, 0xCF,
+ 0xC5, 0x00, 0x5D, 0x00, 0x5E, 0x00, 0x82 },
+ { MCS_GAMMA_CTRL, 0x00,
+ 0x18, 0x08, 0x24, 0x70, 0x51, 0x3E, 0xBF,
+ 0xC1, 0xAF, 0xB9, 0xBC, 0xAB, 0xCC, 0xCC,
+ 0xC2, 0x00, 0x65, 0x00, 0x67, 0x00, 0x8D },
+ { MCS_GAMMA_CTRL, 0x00,
+ 0x18, 0x08, 0x24, 0x6C, 0x54, 0x3A, 0xBC,
+ 0xBF, 0xAC, 0xB7, 0xBB, 0xA9, 0xC9, 0xC9,
+ 0xBE, 0x00, 0x71, 0x00, 0x73, 0x00, 0x9E },
+ { MCS_GAMMA_CTRL, 0x00,
+ 0x18, 0x08, 0x24, 0x69, 0x54, 0x37, 0xBB,
+ 0xBE, 0xAC, 0xB4, 0xB7, 0xA6, 0xC7, 0xC8,
+ 0xBC, 0x00, 0x7B, 0x00, 0x7E, 0x00, 0xAB },
+ { MCS_GAMMA_CTRL, 0x00,
+ 0x18, 0x08, 0x24, 0x66, 0x55, 0x34, 0xBA,
+ 0xBD, 0xAB, 0xB1, 0xB5, 0xA3, 0xC5, 0xC6,
+ 0xB9, 0x00, 0x85, 0x00, 0x88, 0x00, 0xBA },
+ { MCS_GAMMA_CTRL, 0x00,
+ 0x18, 0x08, 0x24, 0x63, 0x53, 0x31, 0xB8,
+ 0xBC, 0xA9, 0xB0, 0xB5, 0xA2, 0xC4, 0xC4,
+ 0xB8, 0x00, 0x8B, 0x00, 0x8E, 0x00, 0xC2 },
+ { MCS_GAMMA_CTRL, 0x00,
+ 0x18, 0x08, 0x24, 0x62, 0x54, 0x30, 0xB9,
+ 0xBB, 0xA9, 0xB0, 0xB3, 0xA1, 0xC1, 0xC3,
+ 0xB7, 0x00, 0x91, 0x00, 0x95, 0x00, 0xDA },
+ { MCS_GAMMA_CTRL, 0x00,
+ 0x18, 0x08, 0x24, 0x66, 0x58, 0x34, 0xB6,
+ 0xBA, 0xA7, 0xAF, 0xB3, 0xA0, 0xC1, 0xC2,
+ 0xB7, 0x00, 0x97, 0x00, 0x9A, 0x00, 0xD1 },
+ { MCS_GAMMA_CTRL, 0x00,
+ 0x18, 0x08, 0x24, 0x64, 0x56, 0x33, 0xB6,
+ 0xBA, 0xA8, 0xAC, 0xB1, 0x9D, 0xC1, 0xC1,
+ 0xB7, 0x00, 0x9C, 0x00, 0x9F, 0x00, 0xD6 },
+ { MCS_GAMMA_CTRL, 0x00,
+ 0x18, 0x08, 0x24, 0x5f, 0x50, 0x2d, 0xB6,
+ 0xB9, 0xA7, 0xAd, 0xB1, 0x9f, 0xbe, 0xC0,
+ 0xB5, 0x00, 0xa0, 0x00, 0xa4, 0x00, 0xdb },
+};
+
+struct s6e63m0 {
+ struct device *dev;
+ struct drm_panel panel;
+ struct backlight_device *bl_dev;
+
+ struct regulator_bulk_data supplies[2];
+ struct gpio_desc *reset_gpio;
+
+ bool prepared;
+ bool enabled;
+
+ /*
+ * This field is tested by functions directly accessing bus before
+ * transfer, transfer is skipped if it is set. In case of transfer
+ * failure or unexpected response the field is set to error value.
+ * Such construct allows to eliminate many checks in higher level
+ * functions.
+ */
+ int error;
+};
+
+static const struct drm_display_mode default_mode = {
+ .clock = 25628,
+ .hdisplay = 480,
+ .hsync_start = 480 + 16,
+ .hsync_end = 480 + 16 + 2,
+ .htotal = 480 + 16 + 2 + 16,
+ .vdisplay = 800,
+ .vsync_start = 800 + 28,
+ .vsync_end = 800 + 28 + 2,
+ .vtotal = 800 + 28 + 2 + 1,
+ .vrefresh = 60,
+ .width_mm = 53,
+ .height_mm = 89,
+ .flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
+};
+
+static inline struct s6e63m0 *panel_to_s6e63m0(struct drm_panel *panel)
+{
+ return container_of(panel, struct s6e63m0, panel);
+}
+
+static int s6e63m0_clear_error(struct s6e63m0 *ctx)
+{
+ int ret = ctx->error;
+
+ ctx->error = 0;
+ return ret;
+}
+
+static int s6e63m0_spi_write_word(struct s6e63m0 *ctx, u16 data)
+{
+ struct spi_device *spi = to_spi_device(ctx->dev);
+ struct spi_transfer xfer = {
+ .len = 2,
+ .tx_buf = &data,
+ };
+ struct spi_message msg;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ return spi_sync(spi, &msg);
+}
+
+static void s6e63m0_dcs_write(struct s6e63m0 *ctx, const u8 *data, size_t len)
+{
+ int ret = 0;
+
+ if (ctx->error < 0 || len == 0)
+ return;
+
+ DRM_DEV_DEBUG(ctx->dev, "writing dcs seq: %*ph\n", (int)len, data);
+ ret = s6e63m0_spi_write_word(ctx, *data);
+
+ while (!ret && --len) {
+ ++data;
+ ret = s6e63m0_spi_write_word(ctx, *data | DATA_MASK);
+ }
+
+ if (ret) {
+ DRM_DEV_ERROR(ctx->dev, "error %d writing dcs seq: %*ph\n", ret,
+ (int)len, data);
+ ctx->error = ret;
+ }
+
+ usleep_range(300, 310);
+}
+
+#define s6e63m0_dcs_write_seq_static(ctx, seq ...) \
+ ({ \
+ static const u8 d[] = { seq }; \
+ s6e63m0_dcs_write(ctx, d, ARRAY_SIZE(d)); \
+ })
+
+static void s6e63m0_brightness_set(struct s6e63m0 *ctx)
+{
+ int brightness = ctx->bl_dev->props.brightness;
+
+ /* disable and set new gamma */
+ s6e63m0_dcs_write(ctx, s6e63m0_gamma_22[brightness],
+ ARRAY_SIZE(s6e63m0_gamma_22[brightness]));
+
+ /* update gamma table. */
+ s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x01);
+}
+
+static void s6e63m0_init(struct s6e63m0 *ctx)
+{
+ s6e63m0_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION,
+ 0x01, 0x27, 0x27, 0x07, 0x07, 0x54, 0x9f,
+ 0x63, 0x86, 0x1a, 0x33, 0x0d, 0x00, 0x00);
+
+ s6e63m0_dcs_write_seq_static(ctx, MCS_DISPLAY_CONDITION,
+ 0x02, 0x03, 0x1c, 0x10, 0x10);
+ s6e63m0_dcs_write_seq_static(ctx, 0xf7,
+ 0x03, 0x00, 0x00);
+
+ s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL,
+ 0x00, 0x18, 0x08, 0x24, 0x64, 0x56, 0x33,
+ 0xb6, 0xba, 0xa8, 0xac, 0xb1, 0x9d, 0xc1,
+ 0xc1, 0xb7, 0x00, 0x9c, 0x00, 0x9f, 0x00,
+ 0xd6);
+ s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL,
+ 0x01);
+
+ s6e63m0_dcs_write_seq_static(ctx, MCS_ETC_CONDITION,
+ 0x00, 0x8c, 0x07);
+ s6e63m0_dcs_write_seq_static(ctx, 0xb3,
+ 0xc);
+
+ s6e63m0_dcs_write_seq_static(ctx, 0xb5,
+ 0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
+ 0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
+ 0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
+ 0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
+ 0x21, 0x20, 0x1e, 0x1e);
+
+ s6e63m0_dcs_write_seq_static(ctx, 0xb6,
+ 0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
+ 0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
+ 0x66, 0x66);
+
+ s6e63m0_dcs_write_seq_static(ctx, 0xb7,
+ 0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
+ 0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
+ 0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
+ 0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
+ 0x21, 0x20, 0x1e, 0x1e, 0x00, 0x00, 0x11,
+ 0x22, 0x33, 0x44, 0x44, 0x44, 0x55, 0x55,
+ 0x66, 0x66, 0x66, 0x66, 0x66, 0x66);
+
+ s6e63m0_dcs_write_seq_static(ctx, 0xb9,
+ 0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
+ 0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
+ 0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
+ 0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
+ 0x21, 0x20, 0x1e, 0x1e);
+
+ s6e63m0_dcs_write_seq_static(ctx, 0xba,
+ 0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
+ 0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
+ 0x66, 0x66);
+
+ s6e63m0_dcs_write_seq_static(ctx, 0xc1,
+ 0x4d, 0x96, 0x1d, 0x00, 0x00, 0x01, 0xdf,
+ 0x00, 0x00, 0x03, 0x1f, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x06,
+ 0x09, 0x0d, 0x0f, 0x12, 0x15, 0x18);
+
+ s6e63m0_dcs_write_seq_static(ctx, 0xb2,
+ 0x10, 0x10, 0x0b, 0x05);
+
+ s6e63m0_dcs_write_seq_static(ctx, MCS_ACL_CTRL,
+ 0x01);
+
+ s6e63m0_dcs_write_seq_static(ctx, MCS_ELVSS_ON,
+ 0x0b);
+
+ s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE);
+}
+
+static int s6e63m0_power_on(struct s6e63m0 *ctx)
+{
+ int ret;
+
+ gpiod_set_value(ctx->reset_gpio, 0);
+ msleep(120);
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+ if (ret < 0)
+ return ret;
+
+ msleep(25);
+
+ return 0;
+}
+
+static int s6e63m0_power_off(struct s6e63m0 *ctx)
+{
+ int ret;
+
+ ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+ if (ret < 0)
+ return ret;
+
+ gpiod_set_value(ctx->reset_gpio, 1);
+ msleep(120);
+
+ return 0;
+}
+
+static int s6e63m0_disable(struct drm_panel *panel)
+{
+ struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
+
+ if (!ctx->enabled)
+ return 0;
+
+ backlight_disable(ctx->bl_dev);
+
+ s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
+ msleep(200);
+
+ ctx->enabled = false;
+
+ return 0;
+}
+
+static int s6e63m0_unprepare(struct drm_panel *panel)
+{
+ struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
+ int ret;
+
+ if (!ctx->prepared)
+ return 0;
+
+ s6e63m0_clear_error(ctx);
+
+ ret = s6e63m0_power_off(ctx);
+ if (ret < 0)
+ return ret;
+
+ ctx->prepared = false;
+
+ return 0;
+}
+
+static int s6e63m0_prepare(struct drm_panel *panel)
+{
+ struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
+ int ret;
+
+ if (ctx->prepared)
+ return 0;
+
+ ret = s6e63m0_power_on(ctx);
+ if (ret < 0)
+ return ret;
+
+ s6e63m0_init(ctx);
+
+ ret = s6e63m0_clear_error(ctx);
+
+ if (ret < 0)
+ s6e63m0_unprepare(panel);
+
+ ctx->prepared = true;
+
+ return ret;
+}
+
+static int s6e63m0_enable(struct drm_panel *panel)
+{
+ struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
+
+ if (ctx->enabled)
+ return 0;
+
+ s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON);
+
+ backlight_enable(ctx->bl_dev);
+
+ ctx->enabled = true;
+
+ return 0;
+}
+
+static int s6e63m0_get_modes(struct drm_panel *panel)
+{
+ struct drm_connector *connector = panel->connector;
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(panel->drm, &default_mode);
+ if (!mode) {
+ DRM_ERROR("failed to add mode %ux%ux@%u\n",
+ default_mode.hdisplay, default_mode.vdisplay,
+ default_mode.vrefresh);
+ return -ENOMEM;
+ }
+
+ drm_mode_set_name(mode);
+
+ mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+ drm_mode_probed_add(connector, mode);
+
+ return 1;
+}
+
+static const struct drm_panel_funcs s6e63m0_drm_funcs = {
+ .disable = s6e63m0_disable,
+ .unprepare = s6e63m0_unprepare,
+ .prepare = s6e63m0_prepare,
+ .enable = s6e63m0_enable,
+ .get_modes = s6e63m0_get_modes,
+};
+
+static int s6e63m0_set_brightness(struct backlight_device *bd)
+{
+ struct s6e63m0 *ctx = bl_get_data(bd);
+
+ s6e63m0_brightness_set(ctx);
+
+ return s6e63m0_clear_error(ctx);
+}
+
+static const struct backlight_ops s6e63m0_backlight_ops = {
+ .update_status = s6e63m0_set_brightness,
+};
+
+static int s6e63m0_backlight_register(struct s6e63m0 *ctx)
+{
+ struct backlight_properties props = {
+ .type = BACKLIGHT_RAW,
+ .brightness = MAX_BRIGHTNESS,
+ .max_brightness = MAX_BRIGHTNESS
+ };
+ struct device *dev = ctx->dev;
+ int ret = 0;
+
+ ctx->bl_dev = devm_backlight_device_register(dev, "panel", dev, ctx,
+ &s6e63m0_backlight_ops,
+ &props);
+ if (IS_ERR(ctx->bl_dev)) {
+ ret = PTR_ERR(ctx->bl_dev);
+ DRM_DEV_ERROR(dev, "error registering backlight device (%d)\n",
+ ret);
+ }
+
+ return ret;
+}
+
+static int s6e63m0_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct s6e63m0 *ctx;
+ int ret;
+
+ ctx = devm_kzalloc(dev, sizeof(struct s6e63m0), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ spi_set_drvdata(spi, ctx);
+
+ ctx->dev = dev;
+ ctx->enabled = false;
+ ctx->prepared = false;
+
+ ctx->supplies[0].supply = "vdd3";
+ ctx->supplies[1].supply = "vci";
+ ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
+ ctx->supplies);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "failed to get regulators: %d\n", ret);
+ return ret;
+ }
+
+ ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(ctx->reset_gpio)) {
+ DRM_DEV_ERROR(dev, "cannot get reset-gpios %ld\n",
+ PTR_ERR(ctx->reset_gpio));
+ return PTR_ERR(ctx->reset_gpio);
+ }
+
+ spi->bits_per_word = 9;
+ spi->mode = SPI_MODE_3;
+ ret = spi_setup(spi);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "spi setup failed.\n");
+ return ret;
+ }
+
+ drm_panel_init(&ctx->panel);
+ ctx->panel.dev = dev;
+ ctx->panel.funcs = &s6e63m0_drm_funcs;
+
+ ret = s6e63m0_backlight_register(ctx);
+ if (ret < 0)
+ return ret;
+
+ return drm_panel_add(&ctx->panel);
+}
+
+static int s6e63m0_remove(struct spi_device *spi)
+{
+ struct s6e63m0 *ctx = spi_get_drvdata(spi);
+
+ drm_panel_remove(&ctx->panel);
+
+ return 0;
+}
+
+static const struct of_device_id s6e63m0_of_match[] = {
+ { .compatible = "samsung,s6e63m0" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, s6e63m0_of_match);
+
+static struct spi_driver s6e63m0_driver = {
+ .probe = s6e63m0_probe,
+ .remove = s6e63m0_remove,
+ .driver = {
+ .name = "panel-samsung-s6e63m0",
+ .of_match_table = s6e63m0_of_match,
+ },
+};
+module_spi_driver(s6e63m0_driver);
+
+MODULE_AUTHOR("Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>");
+MODULE_DESCRIPTION("s6e63m0 LCD Driver");
+MODULE_LICENSE("GPL v2");
--
2.17.1
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  Last update: 2019-02-02 15:28    [W:0.094 / U:41.552 seconds]
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