Re: [PATCH v6 01/10] dt-bindings: display: rockchip: analogix-dp: Fix hclk as third clock for RK3588

RK3588 eDP controller requires HCLK_VO1 to access the VO1 GRF
registers and enable the video datapath.

Previously, the clock was enabled implicitly via the 'rockchip,vo-grf'
phandle reference, which allowed the eDP to work without explicitly
managing the hclk_vo1 clock. However, this is not safe or explicit.

To make the clock dependency explicit, enforce per-SoC clock-names
requirements:
 - RK3288: 2 clocks (dp, pclk)
 - RK3399: 3 clocks (dp, pclk, grf)
 - RK3588: 3 clocks (dp, pclk, hclk)

Do not reuse the 'grf' clock name for RK3588 because it represents
a different clock with distinct control logic:
- The 'grf' clock is only for GRF register access and is toggled
  dynamically during register access.
- The 'hclk' clock controls both GRF access and video datapath
  gating, and must remain enabled during probe.

Fixes: f855146263b1 ("dt-bindings: display: rockchip: analogix-dp: Add support for RK3588")
Signed-off-by: Damon Ding <redacted>

---

Changes in v4:
- Modify the commit msg.

Changes in v5:
- Enforce the correct third clock name on a per-compatible basis.
- Modify the commit msg simultaneously.

Changes in v6:
- Expand more detail commit msg about using hclk instead of grf clock.
---
 .../rockchip/rockchip,analogix-dp.yaml        | 37 +++++++++++++++++--
 1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml b/Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml
index d99b23b88cc5..8001c1facf98 100644
--- a/Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml
+++ b/Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml

@@ -23,10 +23,7 @@ properties:
 
   clock-names:
     minItems: 2
-    items:
-      - const: dp
-      - const: pclk
-      - const: grf

 
   power-domains:
     maxItems: 1

@@ -60,6 +57,33 @@ required:
 allOf:
   - $ref: /schemas/display/bridge/analogix,dp.yaml#
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - rockchip,rk3288-dp
+    then:
+      properties:
+        clock-names:
+          items:
+            - const: dp
+            - const: pclk

+
   - if:
       properties:
         compatible:

@@ -68,6 +92,11 @@ allOf:
               - rockchip,rk3588-edp
     then:
       properties:
+        clock-names:
+          items:
+            - const: dp
+            - const: pclk
+            - const: hclk