[PATCH 1/2] dt-bindings: backlight: Add Texas Instruments LM3509 bindings

[Patrick Gansterer]

Add Device Tree bindings for Texas Instruments LM3509 - a
High Efficiency Boost for White LED's and/or OLED Displays

Signed-off-by: Patrick Gansterer <paroga at paroga.com>
---
 .../bindings/leds/backlight/ti,lm3509.yaml    | 81 +++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/backlight/ti,lm3509.yaml

diff --git a/Documentation/devicetree/bindings/leds/backlight/ti,lm3509.yaml b/Documentation/devicetree/bindings/leds/backlight/ti,lm3509.yaml
new file mode 100644
index 000000000000..8fbb83934e30
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/backlight/ti,lm3509.yaml
@@ -0,0 +1,81 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/backlight/ti,lm3509.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI LM3509 High Efficiency Boost for White LED's and/or OLED Displays
+
+maintainers:
+  - Patrick Gansterer <paroga at paroga.com>
+
+description: |
+  The LM3509 current mode boost converter offers two separate outputs.
+  https://www.ti.com/product/LM3509
+
+properties:
+  compatible:
+    const: ti,lm3509
+
+  reg:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+
+  default-brightness:
+    minimum: 0
+    maximum: 15
+
+  max-brightness:
+    minimum: 0
+    maximum: 15
+
+  ti,brightness-rate-of-change-us:
+    description: Brightness Rate of Change in microseconds.
+    enum: [51, 13000, 26000, 52000]
+
+  ti,oled-mode:
+    description: Enable OLED mode.
+    type: boolean
+
+  ti,unison-mode:
+    description: |
+      Enable unison mode. If disabled, then it will provide two
+      independent controllable LED currents for BMAIN and BSUB.
+    type: boolean
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        backlight at 36 {
+            compatible = "ti,lm3509";
+            reg = <0x36>;
+
+            reset-gpios = <&gpio2 5 GPIO_ACTIVE_LOW>;
+
+            ti,unison-mode;
+        };
+    };
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        backlight at 36 {
+            compatible = "ti,lm3509";
+            reg = <0x36>;
+
+            ti,brightness-rate-of-change-us = <52000>;
+        };
+    };
-- 
2.44.0