linux-kernel - Re: [PATCH 2/4] pinmux: Add TB10x pinmux driver

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Date:	Wed, 28 Aug 2013 20:49:36 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Christian Ruppert <christian.ruppert@...lis.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	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>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Alexandre Courbot <acourbot@...dia.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/4] pinmux: Add TB10x pinmux driver

On Wed, Aug 21, 2013 at 5:57 PM, Christian Ruppert
<christian.ruppert@...lis.com> wrote:
> On Wed, Aug 14, 2013 at 06:53:56PM +0200, Linus Walleij wrote:
>>
>> OK, that can also be called a "bank" or "register" but whatever.
>
> As you suggested below I re-read Documentation/pinctrl.txt and it got me
> even more confused:
> Am I right in my understanding that the whole concept of a
> "port/bank/register" or whatever we would like to call it does not exist
> in the pinctrl framework?

Not that I know :-)

If what it means is a number of registers from address x thru x+n
words in memory that is called a register range usually, the
Device Tree "regs" property.

If you're referring to a subset of registers dealing with a batch
of pins or a single pin that can use whatever terminology you
want, I consider it a driver-internal detail. Some GPIO drivers
talk about "ports" when they have e.g. 2 x 32bit registers
handling a total of 64 pins, then that is port 0 and port 1 or
something like this, but it's really up to the driver.

Yours,
Linus Walleij
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