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

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Message-ID: <20130830081905.GB6766@ab42.lan>
Date:	Fri, 30 Aug 2013 10:19:06 +0200
From:	Christian Ruppert <christian.ruppert@...lis.com>
To:	Linus Walleij <linus.walleij@...aro.org>
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 Thu, Aug 29, 2013 at 10:24:30AM +0200, Linus Walleij wrote:
> On Thu, Aug 29, 2013 at 9:35 AM, Christian Ruppert
> <christian.ruppert@...lis.com> wrote:
> > On Wed, Aug 28, 2013 at 08:49:36PM +0200, Linus Walleij wrote:
> >> 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.
> >
> > Actually, it's a set of pins the muxing of which is controlled by the
> > same register. E.g. Port A is the set of all the pins which are
> > controlled by register field A.
> 
> What is wrong with calling that a "pin-set register" or something?

Nothing. Except perhaps that I hope we can confine that concept to the
driver and thus eliminate the need to talk about it altogether ;)

Greetings,
  Christian
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