linux-kernel - Re: [PATCH v2] EDAC: mpc85xx: Add T2080 l2-cache support

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Date:   Fri, 03 Feb 2017 10:55:33 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Borislav Petkov <bp@...en8.de>,
        Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Cc:     "linux-edac\@vger.kernel.org" <linux-edac@...r.kernel.org>,
        "morbidrsa\@gmail.com" <morbidrsa@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>,
        "linuxppc-dev\@lists.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] EDAC: mpc85xx: Add T2080 l2-cache support

Borislav Petkov <bp@...en8.de> writes:

> On Wed, Feb 01, 2017 at 11:46:23PM +0000, Chris Packham wrote:
>> >> diff --git a/drivers/edac/mpc85xx_edac.c b/drivers/edac/mpc85xx_edac.c
>> >> index 8f66cbed70b7..67f7bc3fe5b3 100644
>> >> --- a/drivers/edac/mpc85xx_edac.c
>> >> +++ b/drivers/edac/mpc85xx_edac.c
>> >> @@ -629,6 +629,7 @@ static const struct of_device_id mpc85xx_l2_err_of_match[] = {
>> >>  	{ .compatible = "fsl,p1020-l2-cache-controller", },
>> >>  	{ .compatible = "fsl,p1021-l2-cache-controller", },
>> >>  	{ .compatible = "fsl,p2020-l2-cache-controller", },
>> >> +	{ .compatible = "fsl,t2080-l2-cache-controller", },
>> >
>> > WARNING: DT compatible string "fsl,t2080-l2-cache-controller" appears un-documented -- check ./Documentation/devicetree/bindings/
>> > #58: FILE: drivers/edac/mpc85xx_edac.c:632:
>> > +       { .compatible = "fsl,t2080-l2-cache-controller", },
>> >
>> > What is checkpatch.pl trying to tell me here?
>> >
>> 
>> checpkatch.pl is confused by 
>> Documentation/devicetree/bindings/powerpc/fsl/l2cache.txt which says
>> 
>> - compatible    : Should include "fsl,chip-l2-cache-controller" and "cache"
>>                    where chip is the processor (bsc9132, npc8572 etc.)
>> 
>> So none of the fsl cache controllers pass the checkpatch.pl test.
>
> Hmm, so others do list those names explicitly. For example:
>
> Documentation/devicetree/bindings/pinctrl/allwinner,sunxi-pinctrl.txt
>
> And the patch that added that check to cp:
>
> bff5da433525 ("checkpatch: add DT compatible string documentation checks")
>
> is basically to enforce explicit compatible names.
>
> So I'd like to have an ACK from a PPC maintainer here first before I
> apply this.

It's fine with me:

Acked-by: Michael Ellerman <mpe@...erman.id.au>


Chris if you want to send a patch to add the compatible string to the
l2cache.txt I would merge that, but honestly it doesn't achieve much
other than possibly catching a typo in the compatible name.

cheers