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

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Date:   Fri, 10 Nov 2023 14:17:41 +0000
From:   Daniel Golle <daniel@...rotopia.org>
To:     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 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.

> 
> Regards,
> Angelo
> 
> > +#define MT7988_TOPRGU_SGMII0_GRST		1
> > +#define MT7988_TOPRGU_SGMII1_GRST		2
> > +#define MT7988_TOPRGU_XFI0_GRST			12
> > +#define MT7988_TOPRGU_XFI1_GRST			13
> > +#define MT7988_TOPRGU_XFI_PEXTP0_GRST		14
> > +#define MT7988_TOPRGU_XFI_PEXTP1_GRST		15
> > +#define MT7988_TOPRGU_XFI_PLL_GRST		16
> > +
> > +#define MT7988_TOPRGU_SW_RST_NUM		24
> 
>