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

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Date:	Wed, 30 Apr 2014 21:54:00 +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 09:44 PM, Jason Gunthorpe wrote:
> On Wed, Apr 30, 2014 at 09:39:41PM +0200, Sebastian Hesselbarth wrote:
>> 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.
> 
>> 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.
> 
> That all makes sense, I think the commit message just seemed to say
> something else.

Well, this patch is about moving the pinctrl nodes to the common SoC
dtsi. The next 6 patches are about setting the default pinctrl property.

> Maybe more like:
> 
> NAND and TWSI0 have only one valid pin control choice on Kirkwood,
> move those definitions into the common dtsi.
> 
> For UART0/1 and SPI, which have two choices, move the definition that
> is used in the majority of the board files into the common dtsi.
> Board files that are different will override.

Ok, I see. Well, strictly speaking the setting node itself is always
valid, no matter if the board uses it. So that is why I first moved
them into kirkwood.dtsi and did set the pinctrl-0 property in the
later patches, e.g. commit message of Patch 9 reads:

"""
Most boards use the default UART0/1 pinctrl setting without RTS/CTS.
Add the pinctrl setting to the toplevel SoC UART nodes and put a note
in front of the corresponding pinctrl node to overwrite the setting
on board level. Currently, both boards using a different UART pinctrl
setting (Openblocks A6, A7) already overwrite the pinctrl node.
"""

But I can, of course, reword this commit message.

Sebastian

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