linux-kernel - Re: [PATCH 07/15] ARM: dts: kirkwood: consolidate common pinctrl settings

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Date:	Wed, 30 Apr 2014 21:39:41 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	Mark Rutland <mark.rutland@....com>, Andrew Lunn <andrew@...n.ch>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 07/15] ARM: dts: kirkwood: consolidate common pinctrl
 settings

On 04/30/2014 06:42 PM, Jason Gunthorpe wrote:
> On Wed, Apr 30, 2014 at 02:56:34PM +0200, Sebastian Hesselbarth wrote:
>> All SoCs have the same pinctrl setting for NAND, UART0/1, SPI, TWSI0,
>> and GBE1. Move it to the common pinctrl node that we now have.
> 
> There are two possible choices for UART0, UART1, and SPI on kirkwood..
> 
> For instance I use this on my board:
> 
>                                 pmx_spi0: pmx-spi0 {
>                                         marvell,pins = "mpp7", "mpp10", "mpp11", "mpp12";
>                                         marvell,function = "spi";
>                                 };
> 
> vs
> 
>> +
>> +			pmx_spi: pmx-spi {
>> +				marvell,pins = "mpp0", "mpp1", "mpp2", "mpp3";
>> +				marvell,function = "spi";
>> +			};
> 
> It looks like all the boards in the kernel use the same choice, so it
> makes some sense to consolidate, but I assume a board file can
> override the marvell,pins?

Yes, there are already some boards (e.g. t5325 with spi0) overwriting
pinctrl settings instead of overwriting the pinctrl-0 property. I
thought, I keep this behavior and note it above each pinctrl node in
some of the following patches.

But your comment reminded me of something more important: there is
one set of boards using kirkwood-lsxl.dtsi which does not explicitly
set spi's pinctrl property. So this consolidation potentially breaks
spi on those boards.

An explicit Tested-by for Buffalo Linkstation LS-CHLv2 and/or LS-XHL
would be good.

> Otherwise the rest of your patchset looked sane to me.

I count that as a

Reviewed-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>

Thanks!

Sebastian

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