[RFC 1/9] dt-bindings: display: renesas,cmm: Add R-Car CMM documentation

[Jacopo Mondi <jacopo+renesas@jmondi.org>]

Add device tree bindings documentation for the Renesas R-Car Display
Unit Color Management Module.

CMM is the image enhancement module available on each R-Car DU video
channel.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 .../bindings/display/renesas,cmm.txt          | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/renesas,cmm.txt

diff --git a/Documentation/devicetree/bindings/display/renesas,cmm.txt b/Documentation/devicetree/bindings/display/renesas,cmm.txt
new file mode 100644
index 000000000000..d7674417edb4
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/renesas,cmm.txt
@@ -0,0 +1,24 @@
+* Renesas R-Car Color Management Unit (CMM)
+
+Renesas R-Car image enhancement module connected to R-Car DU video channels.
+
+Required properties:
+ - compatible: shall be:
+   - "renesas,cmm"
+
+ - reg: the address base and length of the memory area where CMM control
+   registers are mapped to.
+
+ - clocks: phandle and clock-specifier pair to the CMM functional clock
+   supplier.
+
+Example:
+--------
+
+	cmm0: cmm@fea40000 {
+		compatible = "renesas,cmm";
+		reg = <0 0xfea40000 0 0x1000>;
+		power-domains = <&sysc R8A7796_PD_ALWAYS_ON>;
+		clocks = <&cpg CPG_MOD 711>;
+		resets = <&cpg 711>;
+	};
-- 
2.21.0