linux-kernel - Re: [PATCH 1/2] pinmux: Add TB10x pinmux driver

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Date:	Fri, 24 May 2013 11:20:31 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Christian Ruppert <christian.ruppert@...lis.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	Patrice CHOTARD <patrice.chotard@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Sascha Leuenberger <sascha.leuenberger@...lis.com>,
	Pierrick Hascoet <pierrick.hascoet@...lis.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 1/2] pinmux: Add TB10x pinmux driver

On Wed, May 22, 2013 at 4:28 PM, Christian Ruppert
<christian.ruppert@...lis.com> wrote:
> On Mon, May 20, 2013 at 10:10:33AM +0200, Linus Walleij wrote:

>> It's not even pinctrl-simple-centric it is completely generic.
>> The code is in drivers/gpio/gpiolib-of.c.
>>
>> It was written by Shiraz Hashin and Haojian Zhuang.
>> At the time I augmented the core code quite a bit to make
>> a good fit.
>
> I agree. Unluckily, it uses pinctrl-internal pin numbering which we
> would have to make coherent with the physical pin numbers of the
> individual packaging variants of the chip in order to expose them to
> customers (see my previous mail at https://lkml.org/lkml/2013/5/22/207).

Again, the Linux pin numberspace is sparse, you can use whatever
pin number you like as long as it fits in a u32 and does not overlap
with other pins.

If you have a problem that the physical pin numbers and the
bank offsets or bits you need to poke or something doesn't
match, that is an issue for the *driver* not for the pin control
subsystem. However the pin control core may provide
cross-mapping helpers as discussed elsewhere, but the
pin control internal numbering is *not* an issue. Those are
just "some number" on a certain pin controller, use the number
from the datasheet if you like.

Yours,
Linus Walleij
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