linux-kernel - [PATCH v3 1/2] dt-bindings: leds: Add Allwinner R329/D1 LED controller

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Message-Id: <20211119054044.16286-1-samuel@sholland.org>
Date:   Thu, 18 Nov 2021 23:40:42 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Pavel Machek <pavel@....cz>, linux-leds@...r.kernel.org
Cc:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        linux-sunxi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Samuel Holland <samuel@...lland.org>
Subject: [PATCH v3 1/2] dt-bindings: leds: Add Allwinner R329/D1 LED controller

The Allwinner R329 and D1 SoCs contain an LED controller designed to
drive a series of RGB LED pixels. It supports PIO and DMA transfers, and
has configurable timing and pixel format.

Signed-off-by: Samuel Holland <samuel@...lland.org>
---

Changes in v3:
 - Removed quotes from enumeration values
 - Added vendor prefix to timing/format properties
 - Renamed "format" property to "pixel-format" for clarity
 - Dropped "vled-supply" as it is unrelated to the controller hardware

Changes in v2:
 - Fixed typo leading to duplicate t1h-ns property
 - Removed "items" layer in definition of dmas/dma-names
 - Replaced uint32 type reference with maxItems in timing properties

 .../leds/allwinner,sun50i-r329-ledc.yaml      | 137 ++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/allwinner,sun50i-r329-ledc.yaml

diff --git a/Documentation/devicetree/bindings/leds/allwinner,sun50i-r329-ledc.yaml b/Documentation/devicetree/bindings/leds/allwinner,sun50i-r329-ledc.yaml
new file mode 100644
index 000000000000..f8ec5fc6e0ba
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/allwinner,sun50i-r329-ledc.yaml
@@ -0,0 +1,137 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/allwinner,sun50i-r329-ledc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner R329 LED Controller Bindings
+
+maintainers:
+  - Samuel Holland <samuel@...lland.org>
+
+description:
+  The LED controller found in Allwinner sunxi SoCs uses a one-wire serial
+  interface to drive up to 1024 RGB LEDs.
+
+properties:
+  compatible:
+    oneOf:
+      - const: allwinner,sun50i-r329-ledc
+      - items:
+          - enum:
+              - allwinner,sun20i-d1-ledc
+          - const: allwinner,sun50i-r329-ledc
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  clocks:
+    items:
+      - description: Bus clock
+      - description: Module clock
+
+  clock-names:
+    items:
+      - const: bus
+      - const: mod
+
+  resets:
+    maxItems: 1
+
+  dmas:
+    maxItems: 1
+    description: TX DMA channel
+
+  dma-names:
+    const: tx
+
+  interrupts:
+    maxItems: 1
+
+  allwinner,pixel-format:
+    description: Pixel format (subpixel transmission order), default is "grb"
+    enum:
+      - bgr
+      - brg
+      - gbr
+      - grb
+      - rbg
+      - rgb
+
+  allwinner,t0h-ns:
+    maxItems: 1
+    description: Length of high pulse when transmitting a "0" bit
+
+  allwinner,t0l-ns:
+    maxItems: 1
+    description: Length of low pulse when transmitting a "0" bit
+
+  allwinner,t1h-ns:
+    maxItems: 1
+    description: Length of high pulse when transmitting a "1" bit
+
+  allwinner,t1l-ns:
+    maxItems: 1
+    description: Length of low pulse when transmitting a "1" bit
+
+  allwinner,treset-ns:
+    maxItems: 1
+    description: Minimum delay between transmission frames
+
+patternProperties:
+  "^multi-led@[0-9a-f]+$":
+    type: object
+    $ref: leds-class-multicolor.yaml#
+    properties:
+      reg:
+        minimum: 0
+        maximum: 1023
+        description: Index of the LED in the series (must be contiguous)
+
+    required:
+      - reg
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - dmas
+  - dma-names
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/leds/common.h>
+
+    ledc: led-controller@...8000 {
+      compatible = "allwinner,sun20i-d1-ledc",
+                   "allwinner,sun50i-r329-ledc";
+      reg = <0x2008000 0x400>;
+      #address-cells = <1>;
+      #size-cells = <0>;
+      clocks = <&ccu 12>, <&ccu 34>;
+      clock-names = "bus", "mod";
+      resets = <&ccu 12>;
+      dmas = <&dma 42>;
+      dma-names = "tx";
+      interrupts = <36 IRQ_TYPE_LEVEL_HIGH>;
+
+      multi-led@0 {
+        reg = <0x0>;
+        color = <LED_COLOR_ID_RGB>;
+        function = LED_FUNCTION_INDICATOR;
+      };
+    };
+
+...
-- 
2.32.0