[PATCH v8 01/10] dt-bindings: display: rockchip: analogix-dp: Fix hclk as third clock for RK3588

[Damon Ding]

Hi Conor,

On 5/26/2026 12:54 AM, Conor Dooley wrote:
> On Mon, May 25, 2026 at 08:53:22PM +0800, Damon Ding wrote:
>> 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 <damon.ding at rock-chips.com>
>>
>> ---
>>
>> 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.
>>
>> Changes in v7:
>> - List all valid clock names at the top level, and constrain the clock
>>    count for each platform with minItems/maxItems in allOf.
>>
>> Changes in v8:
>> - Fix indentation to 10 for enum in clock-names property.
>> ---
>>   .../rockchip/rockchip,analogix-dp.yaml        | 34 ++++++++++++++++++-
>>   1 file changed, 33 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml b/Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml
>> index d99b23b88cc5..a1ab7a77bdd3 100644
>> --- a/Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml
>> +++ b/Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml
>> @@ -26,7 +26,9 @@ properties:
>>       items:
>>         - const: dp
>>         - const: pclk
>> -      - const: grf
>> +      - enum:
>> +          - grf
>> +          - hclk
>>   
>>     power-domains:
>>       maxItems: 1
>> @@ -60,6 +62,32 @@ required:
>>   allOf:
>>     - $ref: /schemas/display/bridge/analogix,dp.yaml#
>>   
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            enum:
>> +              - rockchip,rk3288-dp
>> +    then:
>> +      properties:
>> +        clocks:
>> +          maxItems: 2
>> +        clock-names:
>> +          maxItems: 2
>> +
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            enum:
>> +              - rockchip,rk3399-edp
>> +    then:
>> +      properties:
>> +        clocks:
>> +          minItems: 3
>> +        clock-names:
>> +          minItems: 3
> 
> If you go back to v6, you'll see that I never asked you to remove the
> explict clock-names from here or below. Only the one from the 3288
> section. The minItems was an addition, not a replacement.
> 
> pw-bot: changes-requested
> 

Sorry for the misunderstanding. I will restore the explicit clock-names 
definitions and fix this in next version.

Best regards,
Damon

> 
>> +
>>     - if:
>>         properties:
>>           compatible:
>> @@ -68,6 +96,10 @@ allOf:
>>                 - rockchip,rk3588-edp
>>       then:
>>         properties:
>> +        clocks:
>> +          minItems: 3
>> +        clock-names:
>> +          minItems: 3
>>           resets:
>>             minItems: 2
>>           reset-names:
>> -- 
>> 2.34.1
>>
>>