linux-kernel - Re: [PATCH 1/2] pinctrl: bindings: pinctrl: Add support for TI's IODelay configuration

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Date:	Tue, 17 Mar 2015 18:41:51 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Nishanth Menon <nm@...com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linux-OMAP <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Lokesh Vutla <lokeshvutla@...com>
Subject: Re: [PATCH 1/2] pinctrl: bindings: pinctrl: Add support for TI's
 IODelay configuration

* Linus Walleij <linus.walleij@...aro.org> [150317 18:31]:
> On Tue, Mar 10, 2015 at 7:33 PM, Nishanth Menon <nm@...com> wrote:
> > On 03/10/2015 12:31 PM, Tony Lindgren wrote:
> 
> >> Yes except I'd make use of some kind of #pinctrl-cells here just like
> >> interrupt controller has #interrupt-cells. Then you can have the values
> >> seprate and the controller knows what to do with them based on the
> >> compatible flag and #pinctrl-cells.
> >
> > Something like the following I suppose, where pinctrl-cells is optional?
> >
> > dra7_pmx_core: pinmux@...03400 {
> >         compatible = "ti,dra7-padconf", "pinctrl-single";
> >         reg = <0x4a003400 0x0464>;
> >         #address-cells = <1>;
> >         #size-cells = <0>;
> >         #interrupt-cells = <1>;
> >         interrupt-controller;
> >         pinctrl-single,register-width = <32>;
> >         pinctrl-single,function-mask = <0x3fffffff>;
> > };
> >
> > dra7_iodelay_core: padconf@...4a000 {
> >         compatible = "ti,dra7-iodelay";
> >         reg = <0x4844a000 0x0d1c>;
> >         #address-cells = <1>;
> >         #size-cells = <0>;
> >         #pinctrl-cells = <2>;
> > };
> >
> > Linus,
> >
> > I hope you are ok with the above?
> 
> Hm depends on where the documentation hits I guess?
> 
> Such a generic cell count property has to be to the generic
> pinctrl-bindings.txt document if I read it right.

Yeah agreed. I suggest discussing the binding and the generic
parsing code for it first :)
 
> Overall I guess this will be acceptable but you really need to
> reuse some more code between this driver and pinctrl-single.c
> if I read it right.

It seems with the generic binding the actual driver should be
just the hardware specific code hopefully.

Regards,

Tony
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