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From:   Dong Aisheng <dongas86@gmail.com>
Date:   Mon, 24 Aug 2020 18:30:33 +0800
Message-ID: <CAA+hA=TD8bjmws7FXAP7zZR1dYgtLPzjFrhPg8XwZcpP2ef4ug@mail.gmail.com>
Subject: Re: [PATCH 21/22] arm64: dts: imx8qxp: Remove i.MX7 compatible from USDHC
To:     Krzysztof Kozlowski <krzk@kernel.org>
Cc:     Bough Chen <haibo.chen@nxp.com>,
        Aisheng Dong <aisheng.dong@nxp.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>,
        Anson Huang <anson.huang@nxp.com>,
        "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
        Fabio Estevam <festevam@gmail.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
        "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-pwm@vger.kernel.org" <linux-pwm@vger.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Rob Herring <robh+dt@kernel.org>,
        "linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
        dl-linux-imx <linux-imx@nxp.com>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Thierry Reding <thierry.reding@gmail.com>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
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On Mon, Aug 24, 2020 at 6:32 PM Krzysztof Kozlowski <krzk@kernel.org> wrote=
:
>
> On Mon, Aug 24, 2020 at 10:31:31AM +0000, Bough Chen wrote:
> > > -----Original Message-----
> > > From: Dong Aisheng [mailto:dongas86@gmail.com]
> > > Sent: 2020=E5=B9=B48=E6=9C=8824=E6=97=A5 17:45
> > > To: Krzysztof Kozlowski <krzk@kernel.org>
> > > Cc: Aisheng Dong <aisheng.dong@nxp.com>; devicetree@vger.kernel.org;
> > > linux-serial@vger.kernel.org; Anson Huang <anson.huang@nxp.com>;
> > > linux-gpio@vger.kernel.org; Fabio Estevam <festevam@gmail.com>; Linus
> > > Walleij <linus.walleij@linaro.org>; linux-pm@vger.kernel.org;
> > > linux-mmc@vger.kernel.org; linux-kernel@vger.kernel.org;
> > > linux-pwm@vger.kernel.org; Bartosz Golaszewski
> > > <bgolaszewski@baylibre.com>; Rob Herring <robh+dt@kernel.org>;
> > > linux-mtd@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; Peng=
utronix
> > > Kernel Team <kernel@pengutronix.de>; Thierry Reding
> > > <thierry.reding@gmail.com>; Shawn Guo <shawnguo@kernel.org>; Sascha
> > > Hauer <s.hauer@pengutronix.de>; linux-arm-kernel@lists.infradead.org;
> > > linux-watchdog@vger.kernel.org; Bough Chen <haibo.chen@nxp.com>
> > > Subject: Re: [PATCH 21/22] arm64: dts: imx8qxp: Remove i.MX7 compatib=
le
> > > from USDHC
> > >
> > > On Mon, Aug 24, 2020 at 5:15 PM Krzysztof Kozlowski <krzk@kernel.org>
> > > wrote:
> > > >
> > > > On Mon, Aug 24, 2020 at 09:00:19AM +0000, Aisheng Dong wrote:
> > > > > > From: Krzysztof Kozlowski <krzk@kernel.org>
> > > > > > Sent: Monday, August 24, 2020 12:16 AM
> > > > > >
> > > > > > The USDHC on i.MX 8QXP has its own compatible described in
> > > > > > bindings and used in the driver (with its own quirks).  Remove
> > > > > > additional fsl,imx7d-usdhc compatible to fix dtbs_check warning=
s like:
> > > > > >
> > > > > >   arch/arm64/boot/dts/freescale/imx8qxp-ai_ml.dt.yaml:
> > > mmc@5b010000:
> > > > > >     compatible: ['fsl,imx8qxp-usdhc', 'fsl,imx7d-usdhc'] is too=
 long
> > > > > >     From schema:
> > > > > > /ocumentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> > > > > >
> > > > > >   arch/arm64/boot/dts/freescale/imx8qxp-ai_ml.dt.yaml:
> > > mmc@5b010000:
> > > > > >     compatible: Additional items are not allowed
> > > > > > ('fsl,imx7d-usdhc' was
> > > > > > unexpected)
> > > > > >
> > > > > > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> > > > >
> > > > > For Patch 19-22, I think we should fix dt binding doc.
> > > >
> > > > Are you sure that these USDHC controllers are compatible with i.MX =
7D?
> > > > Could they really run with fsl,imx7d-usdhc compatible?
> > >
> > > AFAIK uSDHC on QXP is derived from the former platforms with adding a=
 few
> > > more new features. e.g. HS400ES/CMDQ.
> > > Let me loop in uSDHC driver owner Haibo Chen to double confirm.
> >
> > Yes, usdhc of imx8qxp can work by using the compatible "fsl, imx7d-usdh=
c", but will not support HS400ES/Command Queue any more. Also imx8qxp suppo=
rt Auto CMD23, but imx7d not.
> > And imx8qxp need to re-config the clock rate after system PM, imx7d do =
not need to do this.
>
> Then we can leave the compatible in DTS and I will correct the device
> tree schema.

Haibo,

As Krzysztof is helping fix uSDHC binding doc in Patch 12/22,
please double check with IC for the whole uSDHC derive relationships on i.M=
X
and feedback to Krzysztof if anything is wrong.

Regards
Aisheng

>
> Best regards,
> Krzysztof