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

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Date:	Tue, 30 Jul 2013 15:22:39 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	hanumant <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 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.

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