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Message-Id: <20220203010020.9924-1-samuel@sholland.org>
Date: Wed, 2 Feb 2022 19:00:18 -0600
From: Samuel Holland <samuel@...lland.org>
To: Pavel Machek <pavel@....cz>, linux-leds@...r.kernel.org
Cc: Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, 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,
Samuel Holland <samuel@...lland.org>,
Maxime Ripard <maxime@...no.tech>,
Rob Herring <robh@...nel.org>
Subject: [PATCH v4 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.
Acked-by: Maxime Ripard <maxime@...no.tech>
Reviewed-by: Rob Herring <robh@...nel.org>
Signed-off-by: Samuel Holland <samuel@...lland.org>
---
Changes in v4:
- Use "default" instead of "maxItems" for timing properties
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..3db3fe766e6a
--- /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:
+ default: 336
+ description: Length of high pulse when transmitting a "0" bit
+
+ allwinner,t0l-ns:
+ default: 840
+ description: Length of low pulse when transmitting a "0" bit
+
+ allwinner,t1h-ns:
+ default: 882
+ description: Length of high pulse when transmitting a "1" bit
+
+ allwinner,t1l-ns:
+ default: 294
+ description: Length of low pulse when transmitting a "1" bit
+
+ allwinner,treset-ns:
+ default: 300000
+ 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;
+ };
+ };
+
+...
--
2.33.1
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