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

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Message-ID: <51F853BF.9040007@codeaurora.org>
Date:	Tue, 30 Jul 2013 17:01:03 -0700
From:	Hanumant Singh <hanumant@...eaurora.org>
To:	Stephen Warren <swarren@...dotorg.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 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.

Thanks
Hanumant

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Sent by an employee of the Qualcomm Innovation Center, Inc.
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