Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 104 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.yaml b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.yaml
new file mode 100644
index 000000000..fcb8429f3
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.yaml
@@ -0,0 +1,104 @@
+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/backlight/pwm-backlight.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: pwm-backlight bindings
+
+maintainers:
+  - Lee Jones <lee.jones@linaro.org>
+  - Daniel Thompson <daniel.thompson@linaro.org>
+  - Jingoo Han <jingoohan1@gmail.com>
+
+properties:
+  compatible:
+    const: pwm-backlight
+
+  pwms:
+    maxItems: 1
+
+  pwm-names: true
+
+  power-supply:
+    description: regulator for supply voltage
+
+  enable-gpios:
+    description:
+      Contains a single GPIO specifier for the GPIO which enables and disables
+      the backlight.
+    maxItems: 1
+
+  post-pwm-on-delay-ms:
+    description:
+      Delay in ms between setting an initial (non-zero) PWM and enabling the
+      backlight using GPIO.
+
+  pwm-off-delay-ms:
+    description:
+      Delay in ms between disabling the backlight using GPIO and setting PWM
+      value to 0.
+
+  brightness-levels:
+    description:
+      Array of distinct brightness levels. Typically these are in the range
+      from 0 to 255, but any range starting at 0 will do. The actual brightness
+      level (PWM duty cycle) will be interpolated from these values. 0 means a
+      0% duty cycle (darkest/off), while the last value in the array represents
+      a 100% duty cycle (brightest).
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+
+  default-brightness-level:
+    description:
+      The default brightness level (index into the array defined by the
+      "brightness-levels" property).
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  num-interpolated-steps:
+    description:
+      Number of interpolated steps between each value of brightness-levels
+      table. This way a high resolution pwm duty cycle can be used without
+      having to list out every possible value in the brightness-level array.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+dependencies:
+  default-brightness-level: [brightness-levels]
+  num-interpolated-steps: [brightness-levels]
+
+required:
+  - compatible
+  - pwms
+  - power-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    backlight {
+        compatible = "pwm-backlight";
+        pwms = <&pwm 0 5000000>;
+
+        brightness-levels = <0 4 8 16 32 64 128 255>;
+        default-brightness-level = <6>;
+
+        power-supply = <&vdd_bl_reg>;
+        enable-gpios = <&gpio 58 0>;
+        post-pwm-on-delay-ms = <10>;
+        pwm-off-delay-ms = <10>;
+    };
+
+  - |
+    // Example using num-interpolation-steps:
+    backlight {
+        compatible = "pwm-backlight";
+        pwms = <&pwm 0 5000000>;
+
+        brightness-levels = <0 2048 4096 8192 16384 65535>;
+        num-interpolated-steps = <2048>;
+        default-brightness-level = <4096>;
+
+        power-supply = <&vdd_bl_reg>;
+        enable-gpios = <&gpio 58 0>;
+    };
+
+...