[PATCH v3] dt-bindings: dma: xilinx: Add power-domains to xlnx,zynqmp-dpdma

[Michal Simek]

DP DMA has own power domain that's why describe required power-domain
property.

Signed-off-by: Michal Simek <michal.simek@xxxxxxx>
---

Changes in v3:
- make power-domains as required property
- also update commit message

Changes in v2:
- rewrite commit message - requested by Krzysztof

The commit b06112cd5e08 ("arm64: dts: zynqmp: Add power domain for the
DisplayPort DMA controller") added this property already in Linux that's
why the patch is also fixing dts_check warnings.

In v2 I got ack from Krzysztof but not adding it because of additional
discussion about required property in v3.
https://lore.kernel.org/r/029ba923-d13e-ea7c-018d-95e179dda2e5@xxxxxxxxxx

---
 .../devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.yaml   | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.yaml b/Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.yaml
index d6cbd95ec26d..2128f4645c98 100644
--- a/Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.yaml
+++ b/Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.yaml
@@ -41,6 +41,9 @@ properties:
   clock-names:
     const: axi_clk
 
+  power-domains:
+    maxItems: 1
+
 required:
   - "#dma-cells"
   - compatible
@@ -48,12 +51,14 @@ required:
   - interrupts
   - clocks
   - clock-names
+  - power-domains
 
 additionalProperties: false
 
 examples:
   - |
     #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/power/xlnx-zynqmp-power.h>
 
     dma: dma-controller@fd4c0000 {
       compatible = "xlnx,zynqmp-dpdma";
@@ -63,6 +68,7 @@ examples:
       clocks = <&dpdma_clk>;
       clock-names = "axi_clk";
       #dma-cells = <1>;
+      power-domains = <&zynqmp_firmware PD_DP>;
     };
 
 ...
-- 
2.36.1