drm/panel: sitronix-st7789v: avoid hardcoding mode info

Avoid hard-coding the default_mode and supply it from match data. One
additional layer of abstraction has been introduced, which will be
needed for specifying other panel information (e.g. bus flags) in the
next steps.
Reviewed-by: Michael Riesch <michael.riesch@wolfvision.net>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230714013756.1546769-9-sre@kernel.org

drivers/gpu/drm/panel/panel-sitronix-st7789v.c

@@ -108,8 +108,13 @@
 			return val;		\
 	} while (0)
 
+struct st7789_panel_info {
+	const struct drm_display_mode *mode;
+};
+
 struct st7789v {
 	struct drm_panel panel;
+	const struct st7789_panel_info *info;
 	struct spi_device *spi;
 	struct gpio_desc *reset;
 	struct regulator *power;
@@ -160,16 +165,21 @@ static const struct drm_display_mode default_mode = {
 	.vtotal = 320 + 8 + 4 + 4,
 };
 
+static const struct st7789_panel_info default_panel = {
+	.mode = &default_mode,
+};
+
 static int st7789v_get_modes(struct drm_panel *panel,
 			     struct drm_connector *connector)
 {
+	struct st7789v *ctx = panel_to_st7789v(panel);
 	struct drm_display_mode *mode;
 
-	mode = drm_mode_duplicate(connector->dev, &default_mode);
+	mode = drm_mode_duplicate(connector->dev, ctx->info->mode);
 	if (!mode) {
-		dev_err(panel->dev, "failed to add mode %ux%ux@%u\n",
-			default_mode.hdisplay, default_mode.vdisplay,
-			drm_mode_vrefresh(&default_mode));
+		dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
+			ctx->info->mode->hdisplay, ctx->info->mode->vdisplay,
+			drm_mode_vrefresh(ctx->info->mode));
 		return -ENOMEM;
 	}
 
@@ -359,6 +369,8 @@ static int st7789v_probe(struct spi_device *spi)
 	spi_set_drvdata(spi, ctx);
 	ctx->spi = spi;
 
+	ctx->info = device_get_match_data(&spi->dev);
+
 	drm_panel_init(&ctx->panel, dev, &st7789v_drm_funcs,
 		       DRM_MODE_CONNECTOR_DPI);
 
@@ -389,13 +401,13 @@ static void st7789v_remove(struct spi_device *spi)
 }
 
 static const struct spi_device_id st7789v_spi_id[] = {
-	{ "st7789v" },
+	{ "st7789v", (unsigned long) &default_panel },
 	{ }
 };
 MODULE_DEVICE_TABLE(spi, st7789v_spi_id);
 
 static const struct of_device_id st7789v_of_match[] = {
-	{ .compatible = "sitronix,st7789v" },
+	{ .compatible = "sitronix,st7789v", .data = &default_panel },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, st7789v_of_match);