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

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Message-ID: <d7b72b3e-c8f4-4675-ae62-26f5ae576f0a@linaro.org>
Date:   Fri, 10 Nov 2023 15:20:53 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Daniel Golle <daniel@...rotopia.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     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 15:17, 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.

Best regards,
Krzysztof