linux-kernel - Re: [PATCH 1/2] dt-bindings: watchdog: mediatek,mtk-wdt: add MT7988 watchdog and toprgu

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Message-ID: <708046ae-a821-420c-959a-ab5cb712aa9e@linaro.org>
Date:   Fri, 10 Nov 2023 16:07:51 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Daniel Golle <daniel@...rotopia.org>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/2] dt-bindings: watchdog: mediatek,mtk-wdt: add MT7988
 watchdog and toprgu

On 10/11/2023 15:51, Daniel Golle wrote:
> On Fri, Nov 10, 2023 at 03:46:14PM +0100, Krzysztof Kozlowski wrote:
>> On 10/11/2023 15:40, Daniel Golle wrote:
>>> On Fri, Nov 10, 2023 at 03:20:53PM +0100, Krzysztof Kozlowski wrote:
>>>> On 10/11/2023 15:17, Daniel Golle wrote:
>>>>> On Fri, Nov 10, 2023 at 12:56:18PM +0100, AngeloGioacchino Del Regno wrote:
>>>>>> Il 10/11/23 01:30, Daniel Golle ha scritto:
>>>>>>> Add binding description for mediatek,mt7988-wdt.
>>>>>>>
>>>>>>> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
>>>>>>> ---
>>>>>>>   .../bindings/watchdog/mediatek,mtk-wdt.yaml          |  1 +
>>>>>>>   include/dt-bindings/reset/mediatek,mt7988-resets.h   | 12 ++++++++++++
>>>>>>>   2 files changed, 13 insertions(+)
>>>>>>>   create mode 100644 include/dt-bindings/reset/mediatek,mt7988-resets.h
>>>>>>>
>>>>>>> diff --git a/Documentation/devicetree/bindings/watchdog/mediatek,mtk-wdt.yaml b/Documentation/devicetree/bindings/watchdog/mediatek,mtk-wdt.yaml
>>>>>>> index cc502838bc398..8d2520241e37f 100644
>>>>>>> --- a/Documentation/devicetree/bindings/watchdog/mediatek,mtk-wdt.yaml
>>>>>>> +++ b/Documentation/devicetree/bindings/watchdog/mediatek,mtk-wdt.yaml
>>>>>>> @@ -25,6 +25,7 @@ properties:
>>>>>>>             - mediatek,mt6735-wdt
>>>>>>>             - mediatek,mt6795-wdt
>>>>>>>             - mediatek,mt7986-wdt
>>>>>>> +          - mediatek,mt7988-wdt
>>>>>>>             - mediatek,mt8183-wdt
>>>>>>>             - mediatek,mt8186-wdt
>>>>>>>             - mediatek,mt8188-wdt
>>>>>>> diff --git a/include/dt-bindings/reset/mediatek,mt7988-resets.h b/include/dt-bindings/reset/mediatek,mt7988-resets.h
>>>>>>> new file mode 100644
>>>>>>> index 0000000000000..fa7c937505e08
>>>>>>> --- /dev/null
>>>>>>> +++ b/include/dt-bindings/reset/mediatek,mt7988-resets.h
>>>>>>> @@ -0,0 +1,12 @@
>>>>>>> +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
>>>>>>> +
>>>>>>> +/* TOPRGU resets */
>>>>>>
>>>>>> The first reset is zero, the second reset is one.
>>>>>>
>>>>>> Where's the zero'th reset? :-)
>>>>>
>>>>> Currently the reset numbers represent the corresponding bit positions in
>>>>> the toprgu register, as this is how the mtk-wdt driver is organized.
>>>>>
>>>>> So there is probably something at bit 0, and also at bit 3~11 and
>>>>> maybe also 17~23, but it's unknown and may be added later once known
>>>>> and/or needed.
>>>>
>>>> There is no need to put register bits, which are not used by the driver,
>>>> in the bindings.
>>>
>>> There aren't. That's why there isn't a zero'th reset (and also not 3~11, 17~24).
>>>
>>> Or should the driver be reorganized to provide a mapping of logical to
>>> physical resets, and then have only the needed once present and start
>>> counting logical resets from 0? This is doable, of course, but it's a
>>> bit of effort just for the aesthetical goal of starting to count from
>>> zero and continous in header file.
>>>
>>> And, of course, chances are that other currently still unused bits
>>> will be needed at a later point which then would mean having to add
>>> them in at least 2 places (header file and mapping logical<->physical)
>>> where as currently it would just mean adding a line defining it in the
>>> header file.
>>
>> You can do it, but it's not what I wrote here. So bear with me:
>>
>> "There is no need to put register bits in the bindings."

No comments here, so I assume you agree with this.

>>
>> You replied "There aren't", which I don't understand in this context. I
>> can be clearer:
>> Drop this hunk.
> 
> So adding the file to include/dt-bindings/reset/ should go into a
> seperate patch? Because including it with the driver itself gave me
> a checkpath warning telling me that dt-bindings should go seperate,
> which is why I included it with the binding docs.

No, I said the hunk should be dropped. Removed.

Best regards,
Krzysztof