[PATCH v2 23/25] drm/panel: sitronix-st7789v: use drm_panel backlight support

From: Sam Ravnborg <sam@ravnborg•org>
To: dri-devel@lists•freedesktop.org,
	Thierry Reding <thierry.reding@gmail•com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard•com>,
	Linus Walleij <linus.walleij@linaro•org>,
	Sam Ravnborg <sam@ravnborg•org>
Cc: Neil Armstrong <narmstrong@baylibre•com>,
	David Airlie <airlied@linux•ie>, Stefan Agner <stefan@agner•ch>,
	Andrzej Hajda <a.hajda@samsung•com>,
	Benjamin Gaignard <benjamin.gaignard@linaro•org>,
	linux-samsung-soc@vger•kernel.org,
	linux-rockchip@lists•infradead.org,
	Tomi Valkeinen <tomi.valkeinen@ti•com>,
	Jagan Teki <jagan@amarulasolutions•com>,
	NXP Linux Team <linux-imx@nxp•com>,
	Jitao Shi <jitao.shi@mediatek•com>,
	Pengutronix Kernel Team <kernel@pengutronix•de>,
	Maarten Lankhorst <maarten.lankhorst@linux•intel.com>,
	Maxime Ripard <mripard@kernel•org>,
	linux-mediatek@lists•infradead.org,
	Abhinav Kumar <abhinavk@codeaurora•org>,
	linux-tegra@vger•kernel.org, Sean Paul <sean@poorly•run>,
	linux-arm-kernel@lists•infradead.org,
	Purism Kernel Team <kernel@puri•sm>,
	linux-renesas-soc@vger•kernel.org,
	Boris Brezillon <boris.brezillon@collabora•com>,
	Daniel Vetter <daniel@ffwll•ch>
Subject: [PATCH v2 23/25] drm/panel: sitronix-st7789v: use drm_panel backlight support
Date: Sat,  7 Dec 2019 15:03:51 +0100	[thread overview]
Message-ID: <20191207140353.23967-24-sam@ravnborg.org> (raw)
In-Reply-To: <20191207140353.23967-1-sam@ravnborg.org>

Use the backlight support in drm_panel to simplify the driver

Signed-off-by: Sam Ravnborg <sam@ravnborg•org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard•com>
Cc: Thierry Reding <thierry.reding@gmail•com>
Cc: Sam Ravnborg <sam@ravnborg•org>
---
 .../gpu/drm/panel/panel-sitronix-st7789v.c    | 37 ++-----------------
 1 file changed, 4 insertions(+), 33 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
index ebefe2f4c26b..cc02c54c1b2e 100644
--- a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
@@ -3,7 +3,6 @@
  * Copyright (C) 2017 Free Electrons
  */
 
-#include <linux/backlight.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
@@ -116,7 +115,6 @@ struct st7789v {
 	struct drm_panel panel;
 	struct spi_device *spi;
 	struct gpio_desc *reset;
-	struct backlight_device *backlight;
 	struct regulator *power;
 };
 
@@ -323,12 +321,6 @@ 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_write_command(ctx, MIPI_DCS_SET_DISPLAY_ON);
 }
 
@@ -339,12 +331,6 @@ static int st7789v_disable(struct drm_panel *panel)
 
 	ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_OFF));
 
-	if (ctx->backlight) {
-		ctx->backlight->props.power = FB_BLANK_POWERDOWN;
-		ctx->backlight->props.state |= BL_CORE_FBBLANK;
-		backlight_update_status(ctx->backlight);
-	}
-
 	return 0;
 }
 
@@ -370,7 +356,6 @@ static const struct drm_panel_funcs st7789v_drm_funcs = {
 
 static int st7789v_probe(struct spi_device *spi)
 {
-	struct device_node *backlight;
 	struct st7789v *ctx;
 	int ret;
 
@@ -394,26 +379,15 @@ static int st7789v_probe(struct spi_device *spi)
 		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_of_backlight(&ctx->panel);
+	if (ret)
+		return ret;
 
 	ret = drm_panel_add(&ctx->panel);
 	if (ret < 0)
-		goto err_free_backlight;
+		return ret;
 
 	return 0;
-
-err_free_backlight:
-	if (ctx->backlight)
-		put_device(&ctx->backlight->dev);
-
-	return ret;
 }
 
 static int st7789v_remove(struct spi_device *spi)
@@ -422,9 +396,6 @@ static int st7789v_remove(struct spi_device *spi)
 
 	drm_panel_remove(&ctx->panel);
 
-	if (ctx->backlight)
-		put_device(&ctx->backlight->dev);
-
 	return 0;
 }
 
-- 
2.20.1


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