[PATCH v7 1/3] dt-bindings: pwm: Add Raspberry Pi RP1 PWM controller

From: Naushir Patuck <[email protected]>

Add the devicetree binding documentation for the PWM
controller found in the Raspberry Pi RP1 chipset.

Signed-off-by: Naushir Patuck <[email protected]>
Co-developed-by: Stanimir Varbanov <[email protected]>
Signed-off-by: Stanimir Varbanov <[email protected]>
Signed-off-by: Andrea della Porta <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
---
 .../bindings/pwm/raspberrypi,rp1-pwm.yaml     | 66 +++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/raspberrypi,rp1-pwm.yaml

diff --git a/Documentation/devicetree/bindings/pwm/raspberrypi,rp1-pwm.yaml b/Documentation/devicetree/bindings/pwm/raspberrypi,rp1-pwm.yaml
new file mode 100644
index 0000000000000..970d0f3b33bbb
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/raspberrypi,rp1-pwm.yaml
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/raspberrypi,rp1-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Raspberry Pi RP1 PWM controller
+
+maintainers:
+  - Naushir Patuck <[email protected]>
+  - Andrea della Porta <[email protected]>
+  - Stanimir Varbanov <[email protected]>
+
+allOf:
+  - $ref: pwm.yaml#
+
+description: |
+  The PWM peripheral is a flexible waveform generator with a
+  variety of operational modes. It has the following features:
+   - four independent output channels
+   - 32-bit counter widths
+   - Seven output generation modes
+   - Optional per-channel output inversion
+   - Optional duty-cycle data FIFO with DMA support
+   - Optional sigma-delta noise shaping engine
+  Serves as a fan speed provider to other nodes for a PWM-connected
+  fan using shared registers (syscon).
+
+properties:
+  compatible:
+    const: raspberrypi,rp1-pwm
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  "#pwm-cells":
+    const: 3
+
+  dmas:
+    maxItems: 1
+    description: |
+      Phandle to the DMA controller and the channel specifier for
+      the duty-cycle FIFO.
+
+  dma-names:
+    items:
+      - const: tx
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    pwm@98000 {
+      compatible = "raspberrypi,rp1-pwm";
+      reg = <0x98000 0x100>;
+      clocks = <&rp1_clocks 17>;
+      #pwm-cells = <3>;
+    };
-- 
2.35.3