drm/panel/panel-sitronix-st7701: Make voltage supplies common to ST7701

The ST7701 and ST7701S all have two voltage supplies, one for internal
logic and one for the TFT matrix driver. The supplies are not property
of the TFT matrix driver, so move them to common ST7701 code.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Guido Günther <agx@sigxcpu.org>
Cc: Jagan Teki <jagan@amarulasolutions.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220710194437.289042-3-marex@denx.de

drivers/gpu/drm/panel/panel-sitronix-st7701.c

@@ -90,8 +90,6 @@ struct st7701_panel_desc {
 	const struct drm_display_mode *mode;
 	unsigned int lanes;
 	enum mipi_dsi_pixel_format format;
-	const char *const *supply_names;
-	unsigned int num_supplies;
 	unsigned int panel_sleep_delay;
 };
 
@@ -100,7 +98,7 @@ struct st7701 {
 	struct mipi_dsi_device *dsi;
 	const struct st7701_panel_desc *desc;
 
-	struct regulator_bulk_data *supplies;
+	struct regulator_bulk_data supplies[2];
 	struct gpio_desc *reset;
 	unsigned int sleep_delay;
 };
@@ -200,7 +198,7 @@ static int st7701_prepare(struct drm_panel *panel)
 
 	gpiod_set_value(st7701->reset, 0);
 
-	ret = regulator_bulk_enable(st7701->desc->num_supplies,
+	ret = regulator_bulk_enable(ARRAY_SIZE(st7701->supplies),
 				    st7701->supplies);
 	if (ret < 0)
 		return ret;
@@ -253,7 +251,7 @@ static int st7701_unprepare(struct drm_panel *panel)
 	 */
 	msleep(st7701->sleep_delay);
 
-	regulator_bulk_disable(st7701->desc->num_supplies, st7701->supplies);
+	regulator_bulk_disable(ARRAY_SIZE(st7701->supplies), st7701->supplies);
 
 	return 0;
 }
@@ -309,17 +307,10 @@ static const struct drm_display_mode ts8550b_mode = {
 	.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,
 	.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 */
 };
 
@@ -327,7 +318,7 @@ static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
 {
 	const struct st7701_panel_desc *desc;
 	struct st7701 *st7701;
-	int ret, i;
+	int ret;
 
 	st7701 = devm_kzalloc(&dsi->dev, sizeof(*st7701), GFP_KERNEL);
 	if (!st7701)
@@ -339,16 +330,10 @@ static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
 	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];
+	st7701->supplies[0].supply = "VCC";
+	st7701->supplies[1].supply = "IOVCC";
 
-	ret = devm_regulator_bulk_get(&dsi->dev, desc->num_supplies,
+	ret = devm_regulator_bulk_get(&dsi->dev, ARRAY_SIZE(st7701->supplies),
 				      st7701->supplies);
 	if (ret < 0)
 		return ret;