linux-kernel - Re: [PATCH 1/3] arm64: Remove CONFIG_SOC_IMX8MQ and use ARCH

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Date:   Fri, 14 Dec 2018 09:12:09 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Abel Vesa <abel.vesa@....com>, Lucas Stach <l.stach@...gutronix.de>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        Aisheng Dong <aisheng.dong@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Olof Johansson <olof@...om.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>, Rob Herring <robh@...nel.org>,
        Will Deacon <will.deacon@....com>,
        Fabio Estevam <fabio.estevam@....com>
Subject: Re: [PATCH 1/3] arm64: Remove CONFIG_SOC_IMX8MQ and use ARCH_MXC
 instead

On Thu, Dec 13, 2018 at 02:51:50PM +0000, Abel Vesa wrote:
...
> > > diff --git a/arch/arm64/Kconfig.platforms
> > > b/arch/arm64/Kconfig.platforms
> > > index 7e1545a..318dbb9 100644
> > > --- a/arch/arm64/Kconfig.platforms
> > > +++ b/arch/arm64/Kconfig.platforms
> > > @@ -148,14 +148,6 @@ config ARCH_MXC
> > >  	  This enables support for the ARMv8 based SoCs in the
> > >  	  NXP i.MX family.
> > >  
> > > -config SOC_IMX8MQ
> > > -	bool "i.MX8MQ support"
> > > -	depends on ARCH_MXC
> > > -	select ARM64_ERRATUM_843419
> > > -	select ARM64_ERRATUM_845719
> > > -	help
> > > -	  This enables support for the i.MX8MQ SoC.
> > > -
> > 
> > NACK on this one. Having a single place where stuff that is absolutely
> > critical for proper SoC operation can be selected is very useful and
> > avoids hard to debug issues due to slightly wrong configs in the long
> > run.
> 
> As mentioned in the cover letter, please ignore this patch set entirely.
> The ARCH_MXC is actually used on arm32 too, so it won't work.
> 
> I'm working on a patchset that will add the Kconfig into 
> drivers/clk/imx/ and in it will add CLK_IMX8MQ. That will
> fix the clock dependency since the CLK_IMX8MQ will depend on
> ARCH_MXC and ARM64. I believe the CLK_IMX8QXP will follow
> the same pattern.
> 
> As for the SOC_IMX8MQ, all the other vendors have one single
> config for all the arm64 platforms. TBH, to control every SoC
> independently it's a little bit of an overkill.

Lucas,

We are still waiting for further comments from Olof [1].  But it sounds
like SoC specific option is not welcomed on ARM64.

Shawn

[1] https://patchwork.kernel.org/patch/10727453/#22378669