From: Krzysztof Kozlowski <krzk@kernel.org>
To: Philipp Zabel <p.zabel@pengutronix.de>, Yao Zi <ziyao@disroot.org>
Cc: Drew Fustini <fustini@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Albert Ou <aou@eecs.berkeley.edu>,
Michal Wilczynski <m.wilczynski@samsung.com>,
Alexandre Ghiti <alex@ghiti.fr>, Rob Herring <robh@kernel.org>,
Han Gao <gaohan@iscas.ac.cn>, Han Gao <rabenda.cn@gmail.com>,
linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
Guo Ren <guoren@kernel.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
linux-riscv@lists.infradead.org, Fu Wei <wefu@redhat.com>
Subject: Re: [PATCH 1/4] dt-bindings: reset: thead,th1520-reset: Add controllers for more subsys
Date: Tue, 2 Sep 2025 17:43:43 +0200 [thread overview]
Message-ID: <8d538aca-a90f-4710-b697-0d7de65bfc4f@kernel.org> (raw)
In-Reply-To: <705de60088f72c1ed575d92e8c4f4b90989385c5.camel@pengutronix.de>
On 02/09/2025 15:57, Philipp Zabel wrote:
> On Di, 2025-09-02 at 15:44 +0200, Krzysztof Kozlowski wrote:
>> 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.
>
> They happen to be reintroduced with exactly the same values, just for
> the AP subsystem reset controller:
Yes, I noticed, but that's different reset controller, so previous ABI
for that controller stops working. Anyway my comment still stays.
Best regards,
Krzysztof
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next prev parent reply other threads:[~2025-09-02 21:44 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-01 4:23 [PATCH 0/4] Add reset controllers for other TH1520 subsystems Yao Zi
2025-09-01 4:23 ` [PATCH 1/4] dt-bindings: reset: thead,th1520-reset: Add controllers for more subsys Yao Zi
2025-09-02 8:27 ` Krzysztof Kozlowski
2025-09-02 9:04 ` Yao Zi
2025-09-02 13:44 ` Krzysztof Kozlowski
2025-09-02 13:57 ` Philipp Zabel
2025-09-02 15:43 ` Krzysztof Kozlowski [this message]
2025-09-02 13:57 ` Philipp Zabel
2025-09-03 0:41 ` Yao Zi
2025-09-01 4:23 ` [PATCH 2/4] reset: th1520: Prepare for supporting multiple controllers Yao Zi
2025-09-01 4:23 ` [PATCH 3/4] reset: th1520: Support reset controllers in more subsystems Yao Zi
2025-09-02 10:50 ` kernel test robot
2025-09-02 14:15 ` Maud Spierings
2025-09-03 0:44 ` Yao Zi
2025-09-01 4:23 ` [PATCH 4/4] riscv: dts: thead: Add reset controllers of more subsystems for TH1520 Yao Zi
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