[PATCH] Avoid error message on rk3328 use

[Etienne Buira <etienne.buira@xxxxxxx>]

rockchip,rk3328-grf-gpio is handled as syscon, but syscon mandates
presence of gpio,syscon-dev node (or it will call dev_err() when probed).
Correct rk3328.dtsi and related documentation to follow syscon's
expectations.

Signed-off-by: Etienne Buira <etienne.buira@xxxxxxx>
---
 .../devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.yaml      | 2 ++
 arch/arm64/boot/dts/rockchip/rk3328.dtsi                        | 1 +
 2 files changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.yaml b/Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.yaml
index d8cce73ea0ae..2c878e7db900 100644
--- a/Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.yaml
+++ b/Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.yaml
@@ -38,6 +38,7 @@ required:
   - compatible
   - gpio-controller
   - "#gpio-cells"
+  - gpio,syscon-dev
 
 additionalProperties: false
 
@@ -47,4 +48,5 @@ examples:
       compatible = "rockchip,rk3328-grf-gpio";
       gpio-controller;
       #gpio-cells = <2>;
+      gpio,syscon-dev = <&grf 0 0>;
     };
diff --git a/arch/arm64/boot/dts/rockchip/rk3328.dtsi b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
index b6f045069ee2..fd25d5bee19f 100644
--- a/arch/arm64/boot/dts/rockchip/rk3328.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
@@ -296,6 +296,7 @@ grf_gpio: gpio {
 			compatible = "rockchip,rk3328-grf-gpio";
 			gpio-controller;
 			#gpio-cells = <2>;
+			gpio,syscon-dev = <&grf 0 0>;
 		};
 
 		power: power-controller {

base-commit: 20cb38a7af88dc40095da7c2c9094da3873fea23
-- 
2.43.0