linux-kernel - Re: [PATCH 0/2] pinctrl: pinctrl-single: new type: pinctrl-single,bits

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Date:	Wed, 5 Sep 2012 11:20:24 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Peter Ujfalusi <peter.ujfalusi@...com>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH 0/2] pinctrl: pinctrl-single: new type:
 pinctrl-single,bits

* Linus Walleij <linus.walleij@...aro.org> [120905 05:11]:
> On Wed, Sep 5, 2012 at 11:01 AM, Peter Ujfalusi <peter.ujfalusi@...com> wrote:
> 
> > When configuring pinmux with pinctrl-single there could be a case when one
> > register is used to configure mux for more than one pin.
> > In this case the use of pinctrl-single,pins is a bit problematic since we can
> > only update the whole register (restricted by the mask).
> > In such a situations the pinctrl-single,bits could provide a safe way to handle
> > the mux.
> >
> > pinctrl-single,bits takes three parameters: <reg offset, value, sub-mask>
> > The sub mask is used to mask part of the register to make sure we do not change
> > bits outside of the scope of this pin.
> >
> > The first patch in this series is to fix the previous pinctrl-since,pins
> > implementation because it was not using the mask on the value which could result
> > changed bits outside of the mask.
> 
> This looks sane to me, but I'd like Tony to ACK before I apply it.

Cool, this should allow handling cases where some pinctrl devices can have
extra aux registers for signal strength etc for some of the pins.

Will take a look.

Tony
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