From: Erin Lo <erin...@mediatek.com>

Add a DT binding documentation of SCP for the
MT8183 SoC from Mediatek.

Signed-off-by: Erin Lo <erin...@mediatek.com>
Signed-off-by: Pi-Hsun Shih <pih...@chromium.org>
Reviewed-by: Rob Herring <r...@kernel.org>
---
Changes from v15, v14, v13, v12, v11, v10, v9, v8, v7, v6:
 - No change.

Changes from v5:
 - Remove dependency on CONFIG_RPMSG_MTK_SCP.

Changes from v4:
 - Add detail of more properties.
 - Document the usage of mtk,rpmsg-name in subnode from the new design.

Changes from v3:
 - No change.

Changes from v2:
 - No change. I realized that for this patch series, there's no need to
   add anything under the mt8183-scp node (neither the mt8183-rpmsg or
   the cros-ec-rpmsg) for them to work, since mt8183-rpmsg is added
   directly as a rproc_subdev by code, and cros-ec-rpmsg is dynamically
   created by SCP name service.

Changes from v1:
 - No change.
---
 .../bindings/remoteproc/mtk,scp.txt           | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/mtk,scp.txt

diff --git a/Documentation/devicetree/bindings/remoteproc/mtk,scp.txt 
b/Documentation/devicetree/bindings/remoteproc/mtk,scp.txt
new file mode 100644
index 000000000000..3ba668bab14b
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/mtk,scp.txt
@@ -0,0 +1,36 @@
+Mediatek SCP Bindings
+----------------------------------------
+
+This binding provides support for ARM Cortex M4 Co-processor found on some
+Mediatek SoCs.
+
+Required properties:
+- compatible           Should be "mediatek,mt8183-scp"
+- reg                  Should contain the address ranges for the two memory
+                       regions, SRAM and CFG.
+- reg-names            Contains the corresponding names for the two memory
+                       regions. These should be named "sram" & "cfg".
+- clocks               Clock for co-processor (See: 
../clock/clock-bindings.txt)
+- clock-names          Contains the corresponding name for the clock. This
+                       should be named "main".
+
+Subnodes
+--------
+
+Subnodes of the SCP represent rpmsg devices. The names of the devices are not
+important. The properties of these nodes are defined by the individual bindings
+for the rpmsg devices - but must contain the following property:
+
+- mtk,rpmsg-name       Contains the name for the rpmsg device. Used to match
+                       the subnode to rpmsg device announced by SCP.
+
+Example:
+
+       scp: scp@10500000 {
+               compatible = "mediatek,mt8183-scp";
+               reg = <0 0x10500000 0 0x80000>,
+                     <0 0x105c0000 0 0x5000>;
+               reg-names = "sram", "cfg";
+               clocks = <&infracfg CLK_INFRA_SCPSYS>;
+               clock-names = "main";
+       };
-- 
2.23.0.rc1.153.gdeed80330f-goog

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