pwm-backlight: Add power supply support

Backlights require a power supply to work properly. This commit adds a
regulator to power up and power down the backlight.

Signed-off-by: Thierry Reding <treding@nvidia.com>

2 files changed, 15 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt
index 72810cc2dbc1..764db86d441a 100644
--- a/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt
+++ b/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt
@@ -10,6 +10,7 @@ Required properties:
       last value in the array represents a 100% duty cycle (brightest).
   - default-brightness-level: the default brightness level (index into the
       array defined by the "brightness-levels" property)
+  - power-supply: regulator for supply voltage
 
 Optional properties:
   - pwm-names: a list of names for the PWM devices specified in the
@@ -29,5 +30,6 @@ Example:
                 brightness-levels = <0 4 8 16 32 64 128 255>;
                 default-brightness-level = <6>;
 
+                power-supply = <&vdd_bl_reg>;
                 enable-gpios = <&gpio 58 0>;
         };
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index cdef4a346555..eec6c98527f9 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -21,6 +21,7 @@
 #include <linux/err.h>
 #include <linux/pwm.h>
 #include <linux/pwm_backlight.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 
 struct pwm_bl_data {
@@ -30,6 +31,7 @@ struct pwm_bl_data {
         unsigned int            lth_brightness;
         unsigned int            *levels;
         bool                    enabled;
+        struct regulator        *power_supply;
         int                     enable_gpio;
         unsigned long           enable_gpio_flags;
         int                     (*notify)(struct device *,
@@ -60,6 +62,10 @@ static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness,
 
         pwm_config(pb->pwm, duty_cycle, pb->period);
 
+        err = regulator_enable(pb->power_supply);
+        if (err < 0)
+                dev_err(pb->dev, "failed to enable power supply\n");
+
         if (gpio_is_valid(pb->enable_gpio)) {
                 if (pb->enable_gpio_flags & PWM_BACKLIGHT_GPIO_ACTIVE_LOW)
                         gpio_set_value(pb->enable_gpio, 0);
@@ -86,6 +92,7 @@ static void pwm_backlight_power_off(struct pwm_bl_data *pb)
                         gpio_set_value(pb->enable_gpio, 0);
         }
 
+        regulator_disable(pb->power_supply);
         pb->enabled = false;
 }
 
@@ -268,6 +275,12 @@ static int pwm_backlight_probe(struct platform_device *pdev)
                 }
         }
 
+        pb->power_supply = devm_regulator_get(&pdev->dev, "power");
+        if (IS_ERR(pb->power_supply)) {
+                ret = PTR_ERR(pb->power_supply);
+                goto err_gpio;
+        }
+
         pb->pwm = devm_pwm_get(&pdev->dev, NULL);
         if (IS_ERR(pb->pwm)) {
                 dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");