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

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Message-ID: <16e6d822-97c1-4dcf-b538-04b6d8881d32@kernel.org>
Date: Mon, 3 Mar 2025 15:07:00 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Michal Wilczynski <m.wilczynski@...sung.com>
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 03/03/2025 10:55, Michal Wilczynski wrote:
> 
> 
> On 3/3/25 09:52, Krzysztof Kozlowski wrote:
>> On 03/03/2025 09:42, Michal Wilczynski wrote:
>>>>> +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:.
>> That's not the question. I know it is not required, I can read code.
>> What is in the hardware?
> 
> I noticed the register SW_GMAC1_GRST_N in section 5.4.2.2.66 of the
> manual (GMAC1_SWRST [2]), which indicates a GMAC1 CLKGEN soft reset.
> Although this could theoretically reset part of the AP clock, it is not
> actually used by the AP clock driver or needed for initialization.

Thanks, this answers here.

Best regards,
Krzysztof