[PATCH v3 02/17] dt-bindings: display: mediatek: add EXDMA yaml for MT8196

paul-pl.chen
2025-05-15T09:35:09Z

From: Paul-pl Chen <paul-pl.chen@mediatek.com>

Add mediatek,exdma.yaml to support EXDMA for MT8196.
The MediaTek display overlap extended DMA engine, namely
OVL_EXDMA or EXDMA, primarily functions as a DMA engine
for reading data from DRAM with various DRAM footprints
and data formats.

Signed-off-by: Nancy Lin <nancy.lin@mediatek.com>
Signed-off-by: Paul-pl Chen <paul-pl.chen@mediatek.com>
---
.../bindings/dma/mediatek,exdma.yaml | 68 +++++++++++++++++++
1 file changed, 68 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/mediatek,exdma.yaml

diff --git a/Documentation/devicetree/bindings/dma/mediatek,exdma.yaml b/Documentation/devicetree/bindings/dma/mediatek,exdma.yaml
new file mode 100644
index 000000000000..eabf0cfc839e
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/mediatek,exdma.yaml
@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/mediatek,exdma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek display overlap extended DMA engine
+
+maintainers:
+ - Chun-Kuang Hu <chunkuang.hu@kernel.org>
+ - Philipp Zabel <p.zabel@pengutronix.de>
+
+description:
+ The MediaTek display overlap extended DMA engine, namely OVL_EXDMA or EXDMA,
+ primarily functions as a DMA engine for reading data from DRAM with various
+ DRAM footprints and data formats. For input sources in certain color formats
+ and color domains, OVL_EXDMA also includes a color transfer function
+ to process pixels into a consistent color domain.
+
+properties:
+ compatible:
+ const: mediatek,mt8196-exdma
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+ power-domains:
+ maxItems: 1
+
+ mediatek,larb:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description: |
+ A phandle to the local arbiters node in the current SoCs.
+ Refer to bindings/memory-controllers/mediatek,smi-larb.yaml.
+
+ iommus:
+ maxItems: 1
+
+ '#dma-cells':
+ const: 1
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - power-domains
+ - mediatek,larb
+
+additionalProperties: false
+
+examples:
+ - |
+ soc {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ exdma: dma-controller@32850000 {
+ compatible = "mediatek,mt8196-exdma";
+ reg = <0 0x32850000 0 0x1000>;
+ clocks = <&ovlsys_config_clk 13>;
+ power-domains = <&hfrpsys 12>;
+ iommus = <&mm_smmu 144>;
+ #dma-cells = <1>;
+ };
+ };
--
2.45.2