linux-kernel - Re: [PATCH v5 09/21] dt-bindings: clock: thead: Add GPU clkgen reset property

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Message-ID: <7296ddb3-2096-4414-bfa4-28fc5bb8ec86@samsung.com>
Date: Mon, 3 Mar 2025 09:42:05 +0100
From: Michal Wilczynski <m.wilczynski@...sung.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, drew@...7.com, guoren@...nel.org,
	wefu@...hat.com, jassisinghbrar@...il.com, paul.walmsley@...ive.com,
	palmer@...belt.com, aou@...s.berkeley.edu, frank.binns@...tec.com,
	matt.coster@...tec.com, maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch,
	ulf.hansson@...aro.org, jszhang@...nel.org, p.zabel@...gutronix.de,
	m.szyprowski@...sung.com, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH v5 09/21] dt-bindings: clock: thead: Add GPU clkgen
 reset property



On 2/21/25 10:11, Krzysztof Kozlowski wrote:
> On Wed, Feb 19, 2025 at 03:02:27PM +0100, Michal Wilczynski wrote:
>> Add a mandatory reset property for the TH1520 VO clock controller that
>> handles the GPU clocks. This reset line controls the GPU CLKGEN reset,
>> which is required for proper GPU clock operation.
>>
>> The reset property is only required for the "thead,th1520-clk-vo"
>> compatible, as it specifically handles the GPU-related clocks.
>>
>> Signed-off-by: Michal Wilczynski <m.wilczynski@...sung.com>
>> ---
>>  .../bindings/clock/thead,th1520-clk-ap.yaml      | 16 ++++++++++++++++
>>  1 file changed, 16 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/clock/thead,th1520-clk-ap.yaml b/Documentation/devicetree/bindings/clock/thead,th1520-clk-ap.yaml
>> index 9d058c00ab3d..6ea8202718d0 100644
>> --- a/Documentation/devicetree/bindings/clock/thead,th1520-clk-ap.yaml
>> +++ b/Documentation/devicetree/bindings/clock/thead,th1520-clk-ap.yaml
>> @@ -40,6 +40,12 @@ properties:
>>              (integer PLL) typically running at 792 MHz (FOUTPOSTDIV), with
>>              a maximum FOUTVCO of 2376 MHz.
>>  
>> +  resets:
>> +    maxItems: 1
>> +    description:
>> +      Required for "thead,th1520-clk-vo". This reset line controls the
> 
> You just added the compatible in other patch, so are you saying you
> added knowingly incomplete code?
> 
> No, this must be squashed.
> 
>> +      GPU CLKGEN reset which is required for proper GPU clock operation.
>> +
>>    "#clock-cells":
>>      const: 1
>>      description:
>> @@ -51,6 +57,16 @@ required:
>>    - clocks
>>    - "#clock-cells"
>>  
>> +allOf:
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            const: thead,th1520-clk-vo
>> +    then:
>> +      required:
>> +        - resets
> 
> else:
> ? What's there? Also reset or no?

If the else: case the reset is not required, as it's only required in
the th1520clk-vo, so there is no need for else:.

> 
> Best regards,
> Krzysztof
> 
>