+#define ST7789V_COLMOD_RGB_FMT_18BITS (6 << 4)
+#define ST7789V_COLMOD_CTRL_FMT_18BITS (6 << 0)
+
+#define ST7789V_RAMCTRL_CMD 0xb0
+#define ST7789V_RAMCTRL_RM_RGB BIT(4)
+#define ST7789V_RAMCTRL_DM_RGB BIT(0)
+#define ST7789V_RAMCTRL_MAGIC (3 << 6)
+#define ST7789V_RAMCTRL_EPF(n) (((n) & 3) << 4)
+
+#define ST7789V_RGBCTRL_CMD 0xb1
+#define ST7789V_RGBCTRL_WO BIT(7)
+#define ST7789V_RGBCTRL_RCM(n) (((n) & 3) << 5)
+#define ST7789V_RGBCTRL_VSYNC_HIGH BIT(3)
+#define ST7789V_RGBCTRL_HSYNC_HIGH BIT(2)
+#define ST7789V_RGBCTRL_PCLK_HIGH BIT(1)
+#define ST7789V_RGBCTRL_VBP(n) ((n) & 0x7f)
+#define ST7789V_RGBCTRL_HBP(n) ((n) & 0x1f)
+
+#define ST7789V_PORCTRL_CMD 0xb2
+#define ST7789V_PORCTRL_IDLE_BP(n) (((n) & 0xf) << 4)
+#define ST7789V_PORCTRL_IDLE_FP(n) ((n) & 0xf)
+#define ST7789V_PORCTRL_PARTIAL_BP(n) (((n) & 0xf) << 4)
+#define ST7789V_PORCTRL_PARTIAL_FP(n) ((n) & 0xf)
+
+#define ST7789V_GCTRL_CMD 0xb7
+#define ST7789V_GCTRL_VGHS(n) (((n) & 7) << 4)
+#define ST7789V_GCTRL_VGLS(n) ((n) & 7)
+
+#define ST7789V_VCOMS_CMD 0xbb
+
+#define ST7789V_LCMCTRL_CMD 0xc0
+#define ST7789V_LCMCTRL_XBGR BIT(5)
+#define ST7789V_LCMCTRL_XMX BIT(3)
+#define ST7789V_LCMCTRL_XMH BIT(2)
+
+#define ST7789V_VDVVRHEN_CMD 0xc2
+#define ST7789V_VDVVRHEN_CMDEN BIT(0)
+
+#define ST7789V_VRHS_CMD 0xc3
+
+#define ST7789V_VDVS_CMD 0xc4
+
+#define ST7789V_FRCTRL2_CMD 0xc6
+
+#define ST7789V_PWCTRL1_CMD 0xd0
+#define ST7789V_PWCTRL1_MAGIC 0xa4
+#define ST7789V_PWCTRL1_AVDD(n) (((n) & 3) << 6)
+#define ST7789V_PWCTRL1_AVCL(n) (((n) & 3) << 4)
+#define ST7789V_PWCTRL1_VDS(n) ((n) & 3)
+
+#define ST7789V_PVGAMCTRL_CMD 0xe0
+#define ST7789V_PVGAMCTRL_JP0(n) (((n) & 3) << 4)
+#define ST7789V_PVGAMCTRL_JP1(n) (((n) & 3) << 4)
+#define ST7789V_PVGAMCTRL_VP0(n) ((n) & 0xf)
+#define ST7789V_PVGAMCTRL_VP1(n) ((n) & 0x3f)
+#define ST7789V_PVGAMCTRL_VP2(n) ((n) & 0x3f)
+#define ST7789V_PVGAMCTRL_VP4(n) ((n) & 0x1f)
+#define ST7789V_PVGAMCTRL_VP6(n) ((n) & 0x1f)
+#define ST7789V_PVGAMCTRL_VP13(n) ((n) & 0xf)
+#define ST7789V_PVGAMCTRL_VP20(n) ((n) & 0x7f)
+#define ST7789V_PVGAMCTRL_VP27(n) ((n) & 7)
+#define ST7789V_PVGAMCTRL_VP36(n) (((n) & 7) << 4)
+#define ST7789V_PVGAMCTRL_VP43(n) ((n) & 0x7f)
+#define ST7789V_PVGAMCTRL_VP50(n) ((n) & 0xf)
+#define ST7789V_PVGAMCTRL_VP57(n) ((n) & 0x1f)
+#define ST7789V_PVGAMCTRL_VP59(n) ((n) & 0x1f)
+#define ST7789V_PVGAMCTRL_VP61(n) ((n) & 0x3f)
+#define ST7789V_PVGAMCTRL_VP62(n) ((n) & 0x3f)
+#define ST7789V_PVGAMCTRL_VP63(n) (((n) & 0xf) << 4)
+
+#define ST7789V_NVGAMCTRL_CMD 0xe1
+#define ST7789V_NVGAMCTRL_JN0(n) (((n) & 3) << 4)
+#define ST7789V_NVGAMCTRL_JN1(n) (((n) & 3) << 4)
+#define ST7789V_NVGAMCTRL_VN0(n) ((n) & 0xf)
+#define ST7789V_NVGAMCTRL_VN1(n) ((n) & 0x3f)
+#define ST7789V_NVGAMCTRL_VN2(n) ((n) & 0x3f)
+#define ST7789V_NVGAMCTRL_VN4(n) ((n) & 0x1f)
+#define ST7789V_NVGAMCTRL_VN6(n) ((n) & 0x1f)
+#define ST7789V_NVGAMCTRL_VN13(n) ((n) & 0xf)
+#define ST7789V_NVGAMCTRL_VN20(n) ((n) & 0x7f)
+#define ST7789V_NVGAMCTRL_VN27(n) ((n) & 7)
+#define ST7789V_NVGAMCTRL_VN36(n) (((n) & 7) << 4)
+#define ST7789V_NVGAMCTRL_VN43(n) ((n) & 0x7f)
+#define ST7789V_NVGAMCTRL_VN50(n) ((n) & 0xf)
+#define ST7789V_NVGAMCTRL_VN57(n) ((n) & 0x1f)
+#define ST7789V_NVGAMCTRL_VN59(n) ((n) & 0x1f)
+#define ST7789V_NVGAMCTRL_VN61(n) ((n) & 0x3f)
+#define ST7789V_NVGAMCTRL_VN62(n) ((n) & 0x3f)
+#define ST7789V_NVGAMCTRL_VN63(n) (((n) & 0xf) << 4)
+
+struct st7789v {
+ struct drm_panel panel;
+ struct spi_device *spi;
+ struct gpio_desc *reset;
+ struct backlight_device *backlight;
+};
+
+enum st7789v_prefix {
+ ST7789V_COMMAND = 0,
+ ST7789V_DATA = 1,
+};
+
+static inline struct st7789v *panel_to_st7789v(struct drm_panel *panel)
+{
+ return container_of(panel, struct st7789v, panel);
+}
+
+static int st7789v_spi_write(struct st7789v *ctx, u8 prefix, u8 data)
+{
+ struct spi_transfer xfer = { };
+ struct spi_message msg;
+ u16 txbuf = ((prefix & 1) << 8) | data;
+
+ spi_message_init(&msg);
+
+ xfer.tx_buf = &txbuf;
+ xfer.bits_per_word = 9;
+ xfer.len = sizeof(txbuf);
+
+ spi_message_add_tail(&xfer, &msg);
+ return spi_sync(ctx->spi, &msg);
+}
+
+static int st7789v_write_command(struct st7789v *ctx, u8 cmd)
+{
+ return st7789v_spi_write(ctx, ST7789V_COMMAND, cmd);
+}
+
+static int st7789v_write_data(struct st7789v *ctx, u8 cmd)
+{
+ return st7789v_spi_write(ctx, ST7789V_DATA, cmd);
+}
+
+static int st7789v_write_command_data(struct st7789v *ctx, u8 cmd,
+ unsigned long n_data, ...)
+{
+ va_list ap;
+ int i;
+
+ st7789v_write_command(ctx, cmd);
+
+ va_start(ap, n_data);
+ for (i = 0; i < n_data; i++)
+ st7789v_write_data(ctx, va_arg(ap, int));
+ va_end(ap);
+
+ return 0;
+}
+
+static const struct drm_display_mode default_mode = {
+ .clock = 7000,
+ .hdisplay = 240,
+ .hsync_start = 240 + 38,
+ .hsync_end = 240 + 38 + 10,
+ .htotal = 240 + 38 + 10 + 10,
+ .vdisplay = 320,
+ .vsync_start = 320 + 8,
+ .vsync_end = 320 + 8 + 4,
+ .vtotal = 320 + 8 + 4 + 4,
+ .vrefresh = 60,
+};
+
+static int st7789v_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) {
+ dev_err(panel->drm->dev, "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);
+
+ panel->connector->display_info.width_mm = 61;
+ panel->connector->display_info.height_mm = 103;
+
+ return 1;
+}
+
+#define NUMARGS(...) (sizeof((int[]){__VA_ARGS__}) / sizeof(int))
+#define st7789v_send(ctx, cmd, ...) \
+ st7789v_write_command_data(ctx, cmd, NUMARGS(__VA_ARGS__), \
+ ##__VA_ARGS__)
+
+static int st7789v_prepare(struct drm_panel *panel)
+{
+ struct st7789v *ctx = panel_to_st7789v(panel);
+
+ gpiod_set_value(ctx->reset, 1);
+ msleep(30);
+ gpiod_set_value(ctx->reset, 0);
+ msleep(120);
+
+ st7789v_send(ctx, ST7789V_SLPOUT_CMD);
+
+ /* We need to wait 120ms after a sleep out command */
+ msleep(120);
+
+ st7789v_send(ctx, ST7789V_MADCTL_CMD, 0);
+
+ st7789v_send(ctx, ST7789V_COLMOD_CMD,
+ ST7789V_COLMOD_CTRL_FMT_18BITS |
+ ST7789V_COLMOD_RGB_FMT_18BITS);
+
+ st7789v_send(ctx, ST7789V_PORCTRL_CMD,
+ 0xc, /* Backporch, normal mode*/
+ 0xc, /* Frontporch, normal mode */
+ 0, /* Disable separate porch control */
+ ST7789V_PORCTRL_IDLE_BP(3) |
+ ST7789V_PORCTRL_IDLE_FP(3),
+ ST7789V_PORCTRL_PARTIAL_BP(3) |
+ ST7789V_PORCTRL_PARTIAL_FP(3));
+
+ st7789v_send(ctx, ST7789V_GCTRL_CMD,
+ ST7789V_GCTRL_VGLS(5) | ST7789V_GCTRL_VGHS(3));
+
+ st7789v_send(ctx, ST7789V_VCOMS_CMD, 0x2b);
+
+ st7789v_send(ctx, ST7789V_LCMCTRL_CMD, ST7789V_LCMCTRL_XMH |
+ ST7789V_LCMCTRL_XMX | ST7789V_LCMCTRL_XBGR);
+
+ st7789v_send(ctx, ST7789V_VDVVRHEN_CMD, ST7789V_VDVVRHEN_CMDEN);
+
+ st7789v_send(ctx, ST7789V_VRHS_CMD, 0xf);
+
+ st7789v_send(ctx, ST7789V_VDVS_CMD, 0x20);
+
+ st7789v_send(ctx, ST7789V_FRCTRL2_CMD, 0xf);
+
+ st7789v_send(ctx, ST7789V_PWCTRL1_CMD, ST7789V_PWCTRL1_MAGIC,
+ ST7789V_PWCTRL1_AVDD(2) | ST7789V_PWCTRL1_AVCL(2) |
+ ST7789V_PWCTRL1_VDS(1));
+
+ st7789v_send(ctx, ST7789V_PVGAMCTRL_CMD,
+ ST7789V_PVGAMCTRL_VP63(0xd),
+ ST7789V_PVGAMCTRL_VP1(0xca),
+ ST7789V_PVGAMCTRL_VP2(0xe),
+ ST7789V_PVGAMCTRL_VP4(8),
+ ST7789V_PVGAMCTRL_VP6(9),
+ ST7789V_PVGAMCTRL_VP13(7),
+ ST7789V_PVGAMCTRL_VP20(0x2d),
+ ST7789V_PVGAMCTRL_VP27(0xb) | ST7789V_PVGAMCTRL_VP36(3),
+ ST7789V_PVGAMCTRL_VP43(0x3d),
+ ST7789V_PVGAMCTRL_JP1(3) | ST7789V_PVGAMCTRL_VP50(4),
+ ST7789V_PVGAMCTRL_VP57(0xa),
+ ST7789V_PVGAMCTRL_VP59(0xa),
+ ST7789V_PVGAMCTRL_VP61(0x1b),
+ ST7789V_PVGAMCTRL_VP62(0x28));
+
+ st7789v_send(ctx, ST7789V_NVGAMCTRL_CMD,
+ ST7789V_NVGAMCTRL_VN63(0xd),
+ ST7789V_NVGAMCTRL_VN1(0xca),
+ ST7789V_NVGAMCTRL_VN2(0xf),
+ ST7789V_NVGAMCTRL_VN4(8),
+ ST7789V_NVGAMCTRL_VN6(8),
+ ST7789V_NVGAMCTRL_VN13(7),
+ ST7789V_NVGAMCTRL_VN20(0x2e),
+ ST7789V_NVGAMCTRL_VN27(0xc) | ST7789V_NVGAMCTRL_VN36(5),
+ ST7789V_NVGAMCTRL_VN43(0x40),
+ ST7789V_NVGAMCTRL_JN1(3) | ST7789V_NVGAMCTRL_VN50(4),
+ ST7789V_NVGAMCTRL_VN57(9),
+ ST7789V_NVGAMCTRL_VN59(0xb),
+ ST7789V_NVGAMCTRL_VN61(0x1b),
+ ST7789V_NVGAMCTRL_VN62(0x28));
+
+ st7789v_send(ctx, ST7789V_INVON_CMD);
+
+ st7789v_send(ctx, ST7789V_RAMCTRL_CMD,
+ ST7789V_RAMCTRL_DM_RGB | ST7789V_RAMCTRL_RM_RGB,
+ ST7789V_RAMCTRL_EPF(3) | ST7789V_RAMCTRL_MAGIC);
+
+ st7789v_send(ctx, ST7789V_RGBCTRL_CMD,
+ ST7789V_RGBCTRL_WO | ST7789V_RGBCTRL_RCM(2) |
+ ST7789V_RGBCTRL_VSYNC_HIGH | ST7789V_RGBCTRL_HSYNC_HIGH |
+ ST7789V_RGBCTRL_PCLK_HIGH,
+ ST7789V_RGBCTRL_VBP(8), ST7789V_RGBCTRL_HBP(20));
+
+ return 0;
+}
+
+static int st7789v_enable(struct drm_panel *panel)
+{
+ struct st7789v *ctx = panel_to_st7789v(panel);
+
+ if (ctx->backlight) {
+ ctx->backlight->props.state &= ~BL_CORE_FBBLANK;
+ ctx->backlight->props.power = FB_BLANK_UNBLANK;
+ backlight_update_status(ctx->backlight);
+ }
+
+ return st7789v_send(ctx, ST7789V_DISPON_CMD);
+}
+
+static int st7789v_disable(struct drm_panel *panel)
+{
+ struct st7789v *ctx = panel_to_st7789v(panel);
+
+ st7789v_send(ctx, ST7789V_DISPOFF_CMD);
+
+ if (ctx->backlight) {
+ ctx->backlight->props.power = FB_BLANK_POWERDOWN;
+ ctx->backlight->props.state |= BL_CORE_FBBLANK;
+ backlight_update_status(ctx->backlight);
+ }
+
+ return 0;
+}
+
+static int st7789v_unprepare(struct drm_panel *panel)
+{
+ struct st7789v *ctx = panel_to_st7789v(panel);
+
+ st7789v_send(ctx, ST7789V_SLPIN_CMD);
+
+ return 0;
+}
+
+static const struct drm_panel_funcs st7789v_drm_funcs = {
+ .disable = st7789v_disable,
+ .enable = st7789v_enable,
+ .get_modes = st7789v_get_modes,
+ .prepare = st7789v_prepare,
+ .unprepare = st7789v_unprepare,
+};
+
+static int st7789v_probe(struct spi_device *spi)
+{
+ struct device_node *backlight;
+ struct st7789v *ctx;
+ int ret;
+
+ ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ spi_set_drvdata(spi, ctx);
+ ctx->spi = spi;
+
+ ctx->panel.dev = &spi->dev;
+ ctx->panel.funcs = &st7789v_drm_funcs;
+
+ ctx->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(ctx->reset)) {
+ dev_err(&spi->dev, "Couldn't get our reset line\n");
+ return PTR_ERR(ctx->reset);
+ }
+
+ backlight = of_parse_phandle(spi->dev.of_node, "backlight", 0);
+ if (backlight) {
+ ctx->backlight = of_find_backlight_by_node(backlight);
+ of_node_put(backlight);
+
+ if (!ctx->backlight)
+ return -EPROBE_DEFER;
+ }
+
+ ret = drm_panel_add(&ctx->panel);
+ if (ret < 0)
+ goto err_free_backlight;
+
+ return 0;
+
+err_free_backlight:
+ if (ctx->backlight)
+ put_device(&ctx->backlight->dev);
+
+ return ret;
+}
+
+static int st7789v_remove(struct spi_device *spi)
+{
+ struct st7789v *ctx = spi_get_drvdata(spi);
+
+ drm_panel_detach(&ctx->panel);
+ drm_panel_remove(&ctx->panel);
+
+ if (ctx->backlight)
+ put_device(&ctx->backlight->dev);
+
+ return 0;
+}
+
+static const struct of_device_id st7789v_of_match[] = {
+ { .compatible = "sitronix,st7789v" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, st7789v_of_match);
+
+static struct spi_driver st7789v_driver = {
+ .probe = st7789v_probe,
+ .remove = st7789v_remove,
+ .driver = {
+ .name = "st7789v",
+ .of_match_table = st7789v_of_match,
+ },
+};
+module_spi_driver(st7789v_driver);
+
+MODULE_AUTHOR("Maxime Ripard <maxime.rip...@free-electrons.com>");
+MODULE_DESCRIPTION("Sitronix st7789v LCD Driver");
+MODULE_LICENSE("GPL v2");
