drm/panel: lvds: Add support for the power-supply property

A significant number of panels need to power up a regulator in order to
operate properly. Add support for the power-supply property to enable and
disable such a regulator whenever needed.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/0c0819bdf88fa948188df95e57a10820a8a4548d.1513854122.git-series.maxime.ripard@free-electrons.com

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c
index e2d57c01200b..57e38a9e7ab4 100644
--- a/drivers/gpu/drm/panel/panel-lvds.c
+++ b/drivers/gpu/drm/panel/panel-lvds.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 
 #include <drm/drmP.h>
@@ -39,6 +40,7 @@ struct panel_lvds {
         bool data_mirror;
 
         struct backlight_device *backlight;
+        struct regulator *supply;
 
         struct gpio_desc *enable_gpio;
         struct gpio_desc *reset_gpio;
@@ -69,6 +71,9 @@ static int panel_lvds_unprepare(struct drm_panel *panel)
         if (lvds->enable_gpio)
                 gpiod_set_value_cansleep(lvds->enable_gpio, 0);
 
+        if (lvds->supply)
+                regulator_disable(lvds->supply);
+
         return 0;
 }
 
@@ -76,6 +81,17 @@ static int panel_lvds_prepare(struct drm_panel *panel)
 {
         struct panel_lvds *lvds = to_panel_lvds(panel);
 
+        if (lvds->supply) {
+                int err;
+
+                err = regulator_enable(lvds->supply);
+                if (err < 0) {
+                        dev_err(lvds->dev, "failed to enable supply: %d\n",
+                                err);
+                        return err;
+                }
+        }
+
         if (lvds->enable_gpio)
                 gpiod_set_value_cansleep(lvds->enable_gpio, 1);
 
@@ -196,6 +212,13 @@ static int panel_lvds_probe(struct platform_device *pdev)
         if (ret < 0)
                 return ret;
 
+        lvds->supply = devm_regulator_get_optional(lvds->dev, "power");
+        if (IS_ERR(lvds->supply)) {
+                ret = PTR_ERR(lvds->supply);
+                dev_err(lvds->dev, "failed to request regulator: %d\n", ret);
+                return ret;
+        }
+
         /* Get GPIOs and backlight controller. */
         lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",
                                                      GPIOD_OUT_LOW);