linux-kernel - Re: [PATCH 1/4] dt-bindings: reset: thead,th1520-reset: Add controllers for more subsys

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Message-ID: <75cafd7e-02a5-41d1-9daf-24bef20dab82@kernel.org>
Date: Tue, 2 Sep 2025 15:44:48 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Yao Zi <ziyao@...root.org>
Cc: Drew Fustini <fustini@...nel.org>, Guo Ren <guoren@...nel.org>,
 Fu Wei <wefu@...hat.com>, Philipp Zabel <p.zabel@...gutronix.de>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Paul Walmsley
 <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>,
 Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
 Michal Wilczynski <m.wilczynski@...sung.com>,
 linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Icenowy Zheng <uwu@...nowy.me>,
 Han Gao <rabenda.cn@...il.com>, Han Gao <gaohan@...as.ac.cn>
Subject: Re: [PATCH 1/4] dt-bindings: reset: thead,th1520-reset: Add
 controllers for more subsys

On 02/09/2025 11:04, Yao Zi wrote:
> On Tue, Sep 02, 2025 at 10:27:53AM +0200, Krzysztof Kozlowski wrote:
>> On Mon, Sep 01, 2025 at 04:23:17AM +0000, Yao Zi wrote:
>>> +/* VO Subsystem */
>>>  #define TH1520_RESET_ID_GPU		0
>>>  #define TH1520_RESET_ID_GPU_CLKGEN	1
>>> -#define TH1520_RESET_ID_NPU		2
>>> -#define TH1520_RESET_ID_WDT0		3
>>> -#define TH1520_RESET_ID_WDT1		4
>>
>> This is ABI break and deserves explanation and its own patchset.
> 
> The registers in control of TH1520_RESET_ID_{NPU,WDT0,WDT1} don't belong
> to the VO reset controller (documented as "thead,th1520-reset"), and
> thus cannot be implemented by it. They're in fact AP subsystem resets,
> which gets supported in Linux with this series.
> 
> Is it okay for you to separate a patch to delete these wrong IDs and add
> them back for the AP reset controller latter? Anyway, I should have
> provided more information about these three resets. Thanks for catching
> this.

So feels like separate patch dropping these resets with above explanation.

Best regards,
Krzysztof