Motorola Surnia Backlight Driver V2

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

@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/rohm,bd65b60.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ROHM BD65B60 LED driver
+
+maintainers:
+  - Bogdan Ionescu <[email protected]>
+
+description: |
+  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.
+
+properties:
+  compatible:
+    const: rohm,bd65b60
+
+  reg:
+    maxItems: 1
+
+  led-sources:
+    description: Select with outputs are enabled.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 1
+    maxItems: 2
+    items:
+      minimum: 1
+      maximum: 2
+
+  rohm,ovp-microvolt:
+    description:
+      Select Over-Voltage-Portection level in microvolts.
+      The only valid values are 25000000uV, 30000000uV and 35000000uV.
+    default: 35000000
+
+
+required:
+  - compatible
+  - reg
+  - led-sources
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/leds/common.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      backlight@64 {
+        compatible = "rohm,bd65b60";
+        reg = <0x64>;
+
+        led-sources = <1>;
+        function = LED_FUNCTION_BACKLIGHT;
+        color = <LED_COLOR_ID_WHITE>;
+
+        rohm,ovp-microvolt = <30000000>;
+      };
+    };
+
+...

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

@@ -9,6 +9,7 @@
 #include <dt-bindings/input/input.h>
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
+#include <dt-bindings/leds/common.h>
 
 / {
 	model = "Motorola Moto G 2015 (osprey)";
@@ -80,6 +81,12 @@
 		startup-delay-us = <300>;
 		vin-supply = <&pm8916_l16>;
 	};
+
+	backlight: backlight {
+		compatible = "led-backlight";
+		leds = <&backlight_led>;
+		default-brightness-level = <192>;
+	};
 };
 
 &blsp_i2c1 {
@@ -125,6 +132,21 @@
 			regulator-active-discharge = <1>;
 		};
 	};
+
+	backlight_led: backlight@64 {
+		compatible = "rohm,bd65b60";
+		reg = <0x64>;
+
+		led-sources = <2>;
+		function = LED_FUNCTION_BACKLIGHT;
+		color = <LED_COLOR_ID_WHITE>;
+
+		default-state = "keep";
+		linux,default-trigger = "backlight";
+
+		pinctrl-0 = <&backlight_reset_default>;
+		pinctrl-names = "default";
+	};
 };
 
 &blsp_i2c2 {
@@ -172,6 +194,7 @@
 		compatible = "motorola,osprey-panel";
 		reg = <0>;
 
+		backlight = <&backlight>;
 		vsp-supply = <&reg_lcd_pos>;
 		vsn-supply = <&reg_lcd_neg>;
 		vddio-supply = <&reg_panel_vddio>;
@@ -370,6 +393,14 @@
 		bias-pull-up;
 	};
 
+	backlight_reset_default: backlight-reset-default-state {
+		pins = "gpio113";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-pull-down;
+		output-high;
+	};
+
 	gpio_keys_default: gpio-keys-default-state {
 		pins = "gpio107";
 		function = "gpio";

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

@@ -8,6 +8,7 @@
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/input/input.h>
 #include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/leds/common.h>
 
 / {
 	model = "Motorola Moto E 2015 LTE (surnia)";
@@ -57,6 +58,31 @@
 		pinctrl-1 = <&usb_id_sleep>;
 		pinctrl-names = "default", "sleep";
 	};
+
+	backlight: backlight {
+		compatible = "led-backlight";
+		leds = <&backlight_led>;
+		default-brightness-level = <192>;
+	};
+};
+
+&blsp_i2c1 {
+	status = "okay";
+
+	backlight_led: led-controller@64 {
+		compatible = "rohm,bd65b60";
+		reg = <0x64>;
+
+		led-sources = <1>;
+		function = LED_FUNCTION_BACKLIGHT;
+		color = <LED_COLOR_ID_WHITE>;
+
+		default-state = "keep";
+		linux,default-trigger = "backlight";
+
+		pinctrl-0 = <&backlight_reset_default>;
+		pinctrl-names = "default";
+	};
 };
 
 &blsp_i2c2 {
@@ -124,7 +150,7 @@
 	panel@0 {
 		compatible = "motorola,surnia-panel";
 		reg = <0>;
-
+		backlight = <&backlight>;
 		power-supply = <&pm8916_l17>;
 		reset-gpios = <&msmgpio 78 GPIO_ACTIVE_LOW>;
 
@@ -320,6 +346,14 @@
 		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";

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

@@ -19,6 +19,7 @@ obj-$(CONFIG_LEDS_AW2013)		+= leds-aw2013.o
 obj-$(CONFIG_LEDS_BCM6328)		+= leds-bcm6328.o
 obj-$(CONFIG_LEDS_BCM6358)		+= leds-bcm6358.o
 obj-$(CONFIG_LEDS_BD2802)		+= leds-bd2802.o
+obj-$(CONFIG_LEDS_BD65B60)		+= leds-bd65b60.o
 obj-$(CONFIG_LEDS_BLINKM)		+= leds-blinkm.o
 obj-$(CONFIG_LEDS_CLEVO_MAIL)		+= leds-clevo-mail.o
 obj-$(CONFIG_LEDS_COBALT_QUBE)		+= leds-cobalt-qube.o