[PATCH 3/4] dt-bindings: pinctrl: mediatek,mt67xx-pinctrl: Document MT6735 pin controller bindings

[Yassine Oudjana <yassine.oudjana@gmail.com>]

From: Yassine Oudjana <y.oudjana@protonmail.com>

Add bindings for the pin controller found on MediaTek MT6735 and
MT6735M SoCs, including describing a method to manually specify
a pin and function in the pinmux property making defining bindings
for each pin/function combination unnecessary. The pin controllers
on those SoCs are generally identical, with the only difference
being the lack of MSDC2 pins (198-203) on MT6735M.

Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
---
 .../pinctrl/mediatek,mt67xx-pinctrl.yaml      | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/mediatek,mt67xx-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/mediatek,mt67xx-pinctrl.yaml
index 1a1a03cede3c..c5b4972caa77 100644
--- a/Documentation/devicetree/bindings/pinctrl/mediatek,mt67xx-pinctrl.yaml
+++ b/Documentation/devicetree/bindings/pinctrl/mediatek,mt67xx-pinctrl.yaml
@@ -20,6 +20,8 @@ properties:
   compatible:
     oneOf:
       - enum:
+          - mediatek,mt6735-pinctrl
+          - mediatek,mt6735m-pinctrl
           - mediatek,mt6765-pinctrl
           - mediatek,mt6795-pinctrl
           - mediatek,mt6797-pinctrl
@@ -63,6 +65,29 @@ required:
 
 allOf:
   - $ref: "pinctrl.yaml#"
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mediatek,mt6735-pinctrl
+              - mediatek,mt6735m-pinctrl
+    then:
+      properties:
+        reg:
+          minItems: 8
+          maxItems: 8
+
+        reg-names:
+          items:
+            - const: gpio
+            - const: iocfg0
+            - const: iocfg1
+            - const: iocfg2
+            - const: iocfg3
+            - const: iocfg4
+            - const: iocfg5
+            - const: eint
   - if:
       properties:
         compatible:
@@ -180,6 +205,22 @@ patternProperties:
               };
             };
           };
+          The MTK_PIN_NO macro can also be used to select a pin and specify
+          a function index:
+          pincontroller {
+            /* Pin 19 set to function 0 (multifunction GPIO) */
+            gpio-pins {
+              pins {
+                pinmux = <(MTK_PIN_NO(19) | 0)>;
+              };
+            };
+            /* Pin 172 set to function 1 (primary function) */
+            msdc1-pins {
+              pins-cmd {
+                pinmux = <(MTK_PIN_NO(172) | 1)>;
+              };
+            };
+          };
         $ref: "pinmux-node.yaml"
 
         properties:
-- 
2.37.3