[RFC net-next v2 1/6] dt-bindings: leds: Add IS32FL3207 controller

[Ahmad Byagowi <ahmadexp@gmail.com>]

The IS32FL3207 is an 18-channel constant-current LED controller
with per-output PWM and current scaling.

Describe I2C addressing, power and shutdown controls, RISET, and
individual or multicolor output groupings. Require board current limits
for each output.

Signed-off-by: Ahmad Byagowi <ahmadexp@gmail.com>
---
 .../bindings/leds/issi,is32fl3207.yaml        | 208 ++++++++++++++++++
 MAINTAINERS                                   |   6 +
 2 files changed, 214 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/issi,is32fl3207.yaml

diff --git a/Documentation/devicetree/bindings/leds/issi,is32fl3207.yaml b/Documentation/devicetree/bindings/leds/issi,is32fl3207.yaml
new file mode 100644
index 000000000..ffb305e9a
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/issi,is32fl3207.yaml
@@ -0,0 +1,208 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/issi,is32fl3207.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Lumissil IS32FL3207 18-channel LED controller
+
+maintainers:
+  - Ahmad Byagowi <ahmadexp@gmail.com>
+
+description: |
+  The IS32FL3207 is an I2C LED controller with 18 individually controlled
+  constant-current outputs. Each output has 8-bit current scaling. PWM
+  brightness control uses the controller's default 8-bit, 62 kHz mode.
+  Outputs may be exposed as individual LEDs or grouped as multicolor LEDs.
+
+  The data sheet is available at:
+    https://www.lumissil.com/assets/pdf/core/IS32FL3207_DS.pdf
+
+properties:
+  compatible:
+    const: issi,is32fl3207
+
+  reg:
+    enum: [0x34, 0x35, 0x36, 0x37]
+
+  vcc-supply:
+    description: Regulator providing power to the VCC pin.
+
+  enable-gpios:
+    maxItems: 1
+    description: GPIO connected to SDB, asserted to enable the controller.
+
+  issi,riset-ohms:
+    minimum: 2000
+    maximum: 76500000
+    description: |
+      Resistance in ohms of the external RISET resistor. The resistor sets the
+      maximum output current according to IOUT(MAX) = 76.5 / RISET amperes.
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  "^led@[0-9a-f]+$":
+    type: object
+    $ref: common.yaml#
+    unevaluatedProperties: false
+
+    properties:
+      reg:
+        minimum: 0
+        maximum: 17
+        description: LED output number.
+
+      led-max-microamp:
+        minimum: 1
+        maximum: 38250
+
+      color:
+        not:
+          enum: [8, 9]
+
+      max-brightness:
+        minimum: 1
+        maximum: 255
+
+      default-state:
+        description:
+          The controller is reset during initialization, so an existing state
+          cannot be preserved.
+        enum: ["on", "off"]
+
+      default-brightness:
+        maximum: 255
+
+    required:
+      - reg
+      - led-max-microamp
+
+  "^multi-led@[0-9a-f]+$":
+    type: object
+    $ref: leds-class-multicolor.yaml#
+    unevaluatedProperties: false
+
+    properties:
+      reg:
+        minimum: 0
+        maximum: 17
+        description: Lowest-numbered LED output used by the group.
+
+      "#address-cells":
+        const: 1
+
+      "#size-cells":
+        const: 0
+
+      max-brightness:
+        minimum: 1
+        maximum: 255
+
+      default-state:
+        description:
+          The controller is reset during initialization, so an existing state
+          cannot be preserved.
+        enum: ["on", "off"]
+
+      default-brightness:
+        maximum: 255
+
+    patternProperties:
+      "^led@[0-9a-f]+$":
+        type: object
+        $ref: common.yaml#
+        unevaluatedProperties: false
+
+        properties:
+          reg:
+            minimum: 0
+            maximum: 17
+            description: LED output number.
+
+          led-max-microamp:
+            minimum: 1
+            maximum: 38250
+
+          color:
+            not:
+              enum: [8, 9]
+
+          max-brightness: false
+
+          default-state: false
+
+          default-brightness: false
+
+          retain-state-shutdown: false
+
+        required:
+          - reg
+          - color
+          - led-max-microamp
+
+    required:
+      - reg
+      - "#address-cells"
+      - "#size-cells"
+
+required:
+  - compatible
+  - reg
+  - issi,riset-ohms
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/leds/common.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        led-controller@34 {
+            compatible = "issi,is32fl3207";
+            reg = <0x34>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            vcc-supply = <&led_3v3>;
+            enable-gpios = <&gpio0 4 GPIO_ACTIVE_HIGH>;
+            issi,riset-ohms = <4700>;
+
+            multi-led@0 {
+                reg = <0>;
+                color = <LED_COLOR_ID_RGB>;
+                function = LED_FUNCTION_STATUS;
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                led@0 {
+                    reg = <0>;
+                    color = <LED_COLOR_ID_RED>;
+                    led-max-microamp = <8100>;
+                };
+
+                led@1 {
+                    reg = <1>;
+                    color = <LED_COLOR_ID_GREEN>;
+                    led-max-microamp = <8100>;
+                };
+
+                led@2 {
+                    reg = <2>;
+                    color = <LED_COLOR_ID_BLUE>;
+                    led-max-microamp = <8100>;
+                };
+            };
+        };
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 932ea1db0..744296f1c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13828,6 +13828,12 @@ S:	Maintained
 F:	Documentation/filesystems/isofs.rst
 F:	fs/isofs/
 
+ISSI IS32FL3207 LED DRIVER
+M:	Ahmad Byagowi <ahmadexp@gmail.com>
+L:	linux-leds@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/leds/issi,is32fl3207.yaml
+
 IT87 HARDWARE MONITORING DRIVER
 M:	Jean Delvare <jdelvare@suse.com>
 L:	linux-hwmon@vger.kernel.org
-- 
2.50.1 (Apple Git-155)