linux-kernel - Re: [PATCH] pinctrl: msm: Add support for MSM TLMM pinmux

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Date:	Tue, 30 Jul 2013 18:08:10 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Hanumant Singh <hanumant@...eaurora.org>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bjorn Andersson <Bjorn.Andersson@...ymobile.com>,
	"Bird, Tim" <Tim.Bird@...ymobile.com>,
	ext Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH] pinctrl: msm: Add support for MSM TLMM pinmux

On 07/30/2013 06:01 PM, Hanumant Singh wrote:
> On 7/30/2013 2:22 PM, Stephen Warren wrote:
>> On 07/30/2013 03:10 PM, hanumant wrote:
>> ...
>>> We actually have the same TLMM pinmux used by several socs of a family.
>>> The number of pins on each soc may vary.
>>> Also a given soc gets used in a number of boards.
>>> The device tree for a given soc is split into the different boards that
>>> its in ie the boards inherit a common soc.dtsi but have separate dts.
>>> The boards for the same soc may use different pin groups for
>>> accomplishing a function, since we have multiple i2c, spi uart etc
>>> peripheral instances on a soc. A different instance of each of the above
>>> peripherals, can be used in different boards, utilizing different
>>> or subset of same pin groups.
>>> Thus I would need to have multiple C files for one soc, based on the
>>> boards that it goes into.
>>
>> The pinctrl driver should be exposing the raw capabilities of the HW.
>> All the board-specific configuration should be expressed in DT. So, the
>> driver shouldn't have to know anything about different boards at
>> compile-time.
>>
> I agree, so I wanted to keep the pin grouping information in DT, we
> already have a board based differentiation of dts files in DT, for the
> same soc.

That's the opposite of what I was saying. Pin groups are a feature of
the SoC design, not the board.

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