linux-kernel - Re: [PATCH 3/3] ARM: dts: imx6sll: Add Rev A board support

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Date:   Wed, 4 Dec 2019 11:39:05 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Anson Huang <anson.huang@....com>
Cc:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH 3/3] ARM: dts: imx6sll: Add Rev A board support

On Wed, Dec 04, 2019 at 02:52:11AM +0000, Anson Huang wrote:
> 
> 
> > Subject: Re: [PATCH 3/3] ARM: dts: imx6sll: Add Rev A board support
> > 
> > On Wed, Nov 06, 2019 at 05:47:30PM +0800, Anson Huang wrote:
> > > i.MX6SLL EVK Rev A board is same with latest i.MX6SLL EVK board except
> > > eMMC can ONLY run at HS200 mode, add support for this board.
> > >
> > > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > > ---
> > >  arch/arm/boot/dts/Makefile             |  1 +
> > >  arch/arm/boot/dts/imx6sll-evk-reva.dts | 12 ++++++++++++
> > >  2 files changed, 13 insertions(+)
> > >  create mode 100644 arch/arm/boot/dts/imx6sll-evk-reva.dts
> > >
> > > diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> > > index 71f08e7..3845bbf 100644
> > > --- a/arch/arm/boot/dts/Makefile
> > > +++ b/arch/arm/boot/dts/Makefile
> > > @@ -557,6 +557,7 @@ dtb-$(CONFIG_SOC_IMX6SL) += \
> > >  	imx6sl-warp.dtb
> > >  dtb-$(CONFIG_SOC_IMX6SLL) += \
> > >  	imx6sll-evk.dtb \
> > > +	imx6sll-evk-reva.dtb \
> > >  	imx6sll-kobo-clarahd.dtb
> > >  dtb-$(CONFIG_SOC_IMX6SX) += \
> > >  	imx6sx-nitrogen6sx.dtb \
> > > diff --git a/arch/arm/boot/dts/imx6sll-evk-reva.dts
> > > b/arch/arm/boot/dts/imx6sll-evk-reva.dts
> > > new file mode 100644
> > > index 0000000..7ca2563
> > > --- /dev/null
> > > +++ b/arch/arm/boot/dts/imx6sll-evk-reva.dts
> > > @@ -0,0 +1,12 @@
> > > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > > +/*
> > > + * Copyright 2016 Freescale Semiconductor, Inc.
> > > + * Copyright 2017-2019 NXP.
> > > + *
> > > + */
> > > +
> > > +#include "imx6sll-evk.dts"
> > > +
> > > +&usdhc2 {
> > > +	compatible = "fsl,imx6sll-usdhc", "fsl,imx6sx-usdhc";
> > 
> > It looks odd to me that we need to deal with a board level difference with a
> > SoC level compatible.  The USDHC compatible should be solely determined by
> > the IP programming model, not the board level capability.
> 
> So how to handle such scenario? Current usdhc driver uses SoC compatible to distinguish
> different functions of uSDHC IP, if some boards can NOT support dedicated function due to
> board design regardless of the IP inside, the easy way is just to downgrade the SoC compatible,
> or need uSDHC driver to provide some DT properties for such case? 

So you are saying this is a complete board design limitation, not SoC/IP
related?  In that case, IMO, we need a board level DT property to deal
with it.

Shawn