linux-kernel - Re: [PATCH v2 13/19] dt-bindings: nvmem: imx-ocotp: Update i.MX 8M compatibles

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Message-ID: <20200825071732.GD3458@kozik-lap>
Date:   Tue, 25 Aug 2020 09:17:32 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Sascha Hauer <s.hauer@...gutronix.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Guenter Roeck <linux@...ck-us.net>,
        Li Yang <leoyang.li@....com>, Han Xu <han.xu@....com>,
        Frank Li <frank.li@....com>, Fugang Duan <fugang.duan@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mmc@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-pwm@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v2 13/19] dt-bindings: nvmem: imx-ocotp: Update i.MX 8M
 compatibles

On Tue, Aug 25, 2020 at 06:46:53AM +0200, Sascha Hauer wrote:
> On Mon, Aug 24, 2020 at 06:26:46PM +0200, Krzysztof Kozlowski wrote:
> > +    oneOf:
> > +      - items:
> > +          - enum:
> > +              - fsl,imx6q-ocotp
> > +              - fsl,imx6sl-ocotp
> > +              - fsl,imx6sx-ocotp
> > +              - fsl,imx6ul-ocotp
> > +              - fsl,imx6ull-ocotp
> > +              - fsl,imx7d-ocotp
> > +              - fsl,imx6sll-ocotp
> > +              - fsl,imx7ulp-ocotp
> > +              - fsl,imx8mq-ocotp
> > +              - fsl,imx8mm-ocotp
> > +              - fsl,imx8mn-ocotp
> > +              - fsl,imx8mp-ocotp
> > +          - const: syscon
> > +      - items:
> > +          # The devices are not really compatible with fsl,imx8mm-ocotp, however
> > +          # the code for getting SoC revision depends on fsl,imx8mm-ocotp compatible.
> 
> Shouldn't this be fixed? It seems strange to justify a binding with
> existing code.

The fsl,imx8mn-ocotp is actually compatible with "mm", only the
fsl,imx8mp-ocotp is not (although someone might argue that subset of
"mp" falls into "mn").

The problem is that drivers/soc/imx/soc-imx8m.c checks revision only
against the fsl,imx8mm-ocotp compatible, not the others. It's the
pattern used in that driver also for other i.MX 8. Therefore it is a
binding implemented and actually used, regardless whether it is correct
from hardware point of view or not.

If that's preferred, I could adjust the drivers/soc/imx/soc-imx8m.c for
the incompatible "mp". It should not break anything.

Best regards,
Krzysztof