Motorola Surnia Backlight Driver

Documentation/devicetree/bindings/leds/rohm,bd65b60.txt

@@ -0,0 +1,47 @@
+ROHM BD65B60 device tree bindings
+
+BD65B60 is a white LED driver IC that integrates PWM
+step-up DC/DC converter with boost-capability of up to
+maximum 28.5V and current driver with drive capability of up
+to 25mA(Typ.) maximum setting. Precise brightness can be
+controlled at wide ranges through the external PWM pulse
+input.
+
+Ranges below noted as [a, b] are closed ranges between a and b, i.e. a
+and b are included in the range.
+
+Please also see common.txt in the same directory.
+
+
+Required properties
+===================
+
+compatible : Must be "rohm,bd65b60".
+reg : The I2C address of the device. Typically 0x64.
+linux,name : Sysfs name.
+
+Optional properties
+===========================================
+
+linux,default-trigger : Trigger
+rohm,no-reset : Don't trigger software reset during initalisation.
+rohm,default-on : Set LED to on state by default.
+rohm,led1-used : LED1 is being used.
+rohm,led2-used : LED2 is being used.
+rohm,init-level : Default brightness [0, 255].
+rohm,ovp-val : Over Voltage Protection Detect Voltage (can be: 0x0, 0x8 or 0x10)
+
+Example
+=======
+
+ wled: bd65b60@64 {
+ compatible = "rohm,bd65b60";
+ reg = <0x64>;
+ linux,name = "wled:backlight";
+ linux,default-trigger = "bkl-trigger";
+ rohm,no-reset;
+ rohm,led1-used;
+ pinctrl-names = "default";
+ pinctrl-0 = <&backlight_reset_default>;
+ };
+

arch/arm64/boot/dts/qcom/msm8916-motorola-surnia.dts

@@ -57,6 +57,28 @@
  pinctrl-1 = <&usb_id_sleep>;
  pinctrl-names = "default", "sleep";
  };
+
+ backlight: panel-backlight {
+ compatible = "led-backlight";
+ leds = <&wled>;
+ default-brightness-level = <192>;
+ };
+};
+
+&blsp_i2c1 {
+ status = "okay";
+
+ wled: bd65b60@64 {
+ compatible = "rohm,bd65b60";
+ reg = <0x64>;
+ linux,name = "wled:backlight";
+ linux,default-trigger = "bkl-trigger";
+ rohm,no-reset;
+ rohm,led1-used;
+ pinctrl-names = "default";
+ pinctrl-0 = <&backlight_reset_default>;
+ };
+
 };
 
 &blsp_i2c2 {
@@ -124,7 +146,7 @@
  panel@0 {
  compatible = "motorola,surnia-panel";
  reg = <0>;
-
+ backlight = <&backlight>;
  power-supply = <&pm8916_l17>;
  reset-gpios = <&msmgpio 78 GPIO_ACTIVE_LOW>;
 
@@ -320,6 +342,14 @@
  bias-pull-up;
  };
 
+ backlight_reset_default: backlight-reset-default-state {
+ pins = "gpio36";
+ function = "gpio";
+ drive-strength = <2>;
+ bias-pull-down;
+ output-high;
+ };
+
  gpio_keys_default: gpio-keys-default-state {
  pins = "gpio107";
  function = "gpio";
@@ -341,6 +371,13 @@
  bias-pull-down;
  };
 
+ ts_reset_default: ts-reset-default-state {
+ pins = "gpio20";
+ function = "gpio";
+ drive-strength = <2>;
+ bias-disable;
+ };
+
  ts_int_default: ts-int-default-state {
  pins = "gpio21";
  function = "gpio";

drivers/leds/Kconfig

@@ -736,6 +736,17 @@ config LEDS_BLINKM
  This option enables support for the BlinkM RGB LED connected
  through I2C. Say Y to enable support for the BlinkM LED.
 
+config LEDS_BD65B60
+ tristate "LED Driver for BD65B60"
+ depends on LEDS_CLASS
+ depends on I2C
+ help
+ If you have a LCD backlight connected to the ROHM BD65B60,
+ say Y here to enable this driver.
+
+ To compile this driver as a module, choose M here: the module will
+ be called leds-bd65b60.
+
 config LEDS_POWERNV
  tristate "LED support for PowerNV Platform"
  depends on LEDS_CLASS

drivers/leds/Makefile

@@ -86,6 +86,7 @@ obj-$(CONFIG_LEDS_TURRIS_OMNIA) += leds-turris-omnia.o
 obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o
 obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o
 obj-$(CONFIG_LEDS_WRAP) += leds-wrap.o
+obj-$(CONFIG_LEDS_BD65B60) += leds-bd65b60.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o