From 39135a305a0f0a82d60ceb79dcbf094fc4e70123 Mon Sep 17 00:00:00 2001
From: Peter Ujfalusi <peter.ujfalusi@ti.com>
Date: Fri, 9 Sep 2016 13:33:06 +0300
Subject: [PATCH] drm/omap: displays: panel-dpi: Support for handling backlight
 devices

The associated backlight device can be configured via DT by providing the
phandle to the device.

If the backlight device is configured, the driver can manage the backligt
along with the panel's power state, iow it can turn on the backlight when
the panel is enabled and turn it off when the panel is disabled.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 .../bindings/display/panel/panel-dpi.txt           |  3 ++
 drivers/gpu/drm/omapdrm/displays/panel-dpi.c       | 37 ++++++++++++++++++++--
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/panel/panel-dpi.txt b/Documentation/devicetree/bindings/display/panel/panel-dpi.txt
index d4add13..6b203bc 100644
--- a/Documentation/devicetree/bindings/display/panel/panel-dpi.txt
+++ b/Documentation/devicetree/bindings/display/panel/panel-dpi.txt
@@ -9,6 +9,7 @@ Optional properties:
 - enable-gpios: panel enable gpio
 - reset-gpios: GPIO to control the RESET pin
 - vcc-supply: phandle of regulator that will be used to enable power to the display
+- backlight: phandle of the backlight device
 
 Required nodes:
 - "panel-timing" containing video timings
@@ -22,6 +23,8 @@ lcd0: display@0 {
         compatible = "samsung,lte430wq-f0c", "panel-dpi";
         label = "lcd";
 
+        backlight = <&backlight>;
+
         port {
             lcd_in: endpoint {
                     remote-endpoint = <&dpi_out>;
diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dpi.c b/drivers/gpu/drm/omapdrm/displays/panel-dpi.c
index 3800320..04ce8c5 100644
--- a/drivers/gpu/drm/omapdrm/displays/panel-dpi.c
+++ b/drivers/gpu/drm/omapdrm/displays/panel-dpi.c
@@ -16,6 +16,7 @@
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/regulator/consumer.h>
+#include <linux/backlight.h>
 
 #include <video/omap-panel-data.h>
 #include <video/of_display_timing.h>
@@ -30,6 +31,8 @@ struct panel_drv_data {
 
 	struct videomode vm;
 
+	struct backlight_device *backlight;
+
 	/* used for non-DT boot, to be removed */
 	int backlight_gpio;
 
@@ -97,6 +100,11 @@ static int panel_dpi_enable(struct omap_dss_device *dssdev)
 	if (gpio_is_valid(ddata->backlight_gpio))
 		gpio_set_value_cansleep(ddata->backlight_gpio, 1);
 
+	if (ddata->backlight) {
+		ddata->backlight->props.power = FB_BLANK_UNBLANK;
+		backlight_update_status(ddata->backlight);
+	}
+
 	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 
 	return 0;
@@ -113,6 +121,11 @@ static void panel_dpi_disable(struct omap_dss_device *dssdev)
 	if (gpio_is_valid(ddata->backlight_gpio))
 		gpio_set_value_cansleep(ddata->backlight_gpio, 0);
 
+	if (ddata->backlight) {
+		ddata->backlight->props.power = FB_BLANK_POWERDOWN;
+		backlight_update_status(ddata->backlight);
+	}
+
 	gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 	regulator_disable(ddata->vcc_supply);
 
@@ -209,6 +222,7 @@ static int panel_dpi_probe_of(struct platform_device *pdev)
 {
 	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 	struct device_node *node = pdev->dev.of_node;
+	struct device_node *bl_node;
 	struct omap_dss_device *in;
 	int r;
 	struct display_timing timing;
@@ -236,10 +250,19 @@ static int panel_dpi_probe_of(struct platform_device *pdev)
 
 	ddata->backlight_gpio = -ENOENT;
 
+	bl_node = of_parse_phandle(node, "backlight", 0);
+	if (bl_node) {
+		ddata->backlight = of_find_backlight_by_node(bl_node);
+		of_node_put(bl_node);
+
+		if (!ddata->backlight)
+			return -EPROBE_DEFER;
+	}
+
 	r = of_get_display_timing(node, "panel-timing", &timing);
 	if (r) {
 		dev_err(&pdev->dev, "failed to get video timing\n");
-		return r;
+		goto error_free_backlight;
 	}
 
 	videomode_from_timing(&timing, &ddata->vm);
@@ -247,12 +270,19 @@ static int panel_dpi_probe_of(struct platform_device *pdev)
 	in = omapdss_of_find_source_for_first_ep(node);
 	if (IS_ERR(in)) {
 		dev_err(&pdev->dev, "failed to find video source\n");
-		return PTR_ERR(in);
+		r = PTR_ERR(in);
+		goto error_free_backlight;
 	}
 
 	ddata->in = in;
 
 	return 0;
+
+error_free_backlight:
+	if (ddata->backlight)
+		put_device(&ddata->backlight->dev);
+
+	return r;
 }
 
 static int panel_dpi_probe(struct platform_device *pdev)
@@ -321,6 +351,9 @@ static int __exit panel_dpi_remove(struct platform_device *pdev)
 
 	omap_dss_put_device(in);
 
+	if (ddata->backlight)
+		put_device(&ddata->backlight->dev);
+
 	return 0;
 }
 
-- 
2.7.4