[PATCH v16 07/16] dt-bindings: power: rockchip: allow resets in a power domain node

[Jiaxing Hu]

Some power domains need a reset after they are powered on before the
hardware can be accessed.

The RK3576 NPU power domains are like this: without the reset, the first
access to the hardware after power-on can raise an SError.

Allow a resets property in power domain nodes to describe this.

Signed-off-by: Jiaxing Hu <gahing@xxxxxxxxxxxxx>
Acked-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
Reviewed-by: Heiko Stuebner <heiko@xxxxxxxxx>
---
 .../bindings/power/rockchip,power-controller.yaml         | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/rockchip,power-controller.yaml b/Documentation/devicetree/bindings/power/rockchip,power-controller.yaml
index b41db576f95d..83741f048716 100644
--- a/Documentation/devicetree/bindings/power/rockchip,power-controller.yaml
+++ b/Documentation/devicetree/bindings/power/rockchip,power-controller.yaml
@@ -136,6 +136,13 @@ $defs:
           A number of phandles to clocks that need to be enabled
           while power domain switches state.
 
+      resets:
+        maxItems: 1
+        description:
+          A phandle to a reset that needs to be cycled once the power domain has
+          been switched on, for domains whose logic does not come up in a usable
+          state by itself.
+
       domain-supply:
         description: domain regulator supply.
 
@@ -216,6 +223,7 @@ examples:
                     reg = <RK3399_PD_IEP>;
                     clocks = <&cru ACLK_IEP>,
                              <&cru HCLK_IEP>;
+                    resets = <&cru SRST_A_IEP>;
                     pm_qos = <&qos_iep>;
                     #power-domain-cells = <0>;
                 };
-- 
2.43.0