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

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Date:	Tue, 30 Jul 2013 17:13:04 -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 5:08 PM, Stephen Warren wrote:
> 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.
>
Sorry I guess I wasn't clear.
Right now I have a soc-pinctrl.dtsi containing pin groupings.
This will be "inherited" by soc-boardtype.dts.
The pinctrl client device nodes in soc-boardtype.dts will point to pin 
groupings in soc-pinctrl.dtsi that are valid for that particular boardtype.
Is this a valid design?

Thanks
Hanumant
that are valid for that


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