linux-kernel - [PATCH v2 03/15] dt-bindings: display: mediatek: add EXDMA yaml for MT8196

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Message-ID: <20250321093435.94835-4-paul-pl.chen@mediatek.com>
Date: Fri, 21 Mar 2025 17:33:32 +0800
From: paul-pl.chen <paul-pl.chen@...iatek.com>
To: <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
	<chunkuang.hu@...nel.org>, <angelogioacchino.delregno@...labora.com>
CC: <matthias.bgg@...il.com>, <p.zabel@...gutronix.de>,
	<jason-jh.lin@...iatek.com>, <nancy.lin@...iatek.com>,
	<singo.chang@...iatek.com>, <xiandong.wang@...iatek.com>,
	<sirius.wang@...iatek.com>, <paul-pl.chen@...iatek.com>,
	<sunny.shen@...iatek.com>, <fshao@...omium.org>, <treapking@...omium.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-mediatek@...ts.infradead.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: [PATCH v2 03/15] dt-bindings: display: mediatek: add EXDMA yaml for MT8196

From: Paul-pl Chen <paul-pl.chen@...iatek.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: Paul-pl Chen <paul-pl.chen@...iatek.com>
---
 .../bindings/dma/mediatek,exdma.yaml          | 70 +++++++++++++++++++
 1 file changed, 70 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..de7f8283bb48
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/mediatek,exdma.yaml
@@ -0,0 +1,70 @@
+# 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@...nel.org>
+  - Philipp Zabel <p.zabel@...gutronix.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>;
+
+        disp_ovl0_exdma2: dma-controller@...50000 {
+            compatible = "mediatek,mt8196-exdma";
+            reg = <0 0x32850000 0 0x1000>;
+            clocks = <&ovlsys_config_clk 13>;
+            power-domains = <&hfrpsys 12>;
+            mediatek,larb = <&smi_larb0>;
+            iommus = <&mm_smmu 144>;
+            #dma-cells = <1>;
+        };
+    };
-- 
2.45.2