linux-kernel - Re: [PATCH 10/10] ARM: dts: Fix dm814x pinctrl address and mask

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Date:	Wed, 2 Dec 2015 08:13:31 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Matthijs van Duin <matthijsvanduin@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Brian Hutchinson <b.hutchman@...il.com>,
	Delio Brignoli <dbrignoli@...ioscience.com>,
	Neil Armstrong <narmstrong@...libre.com>,
	Philipp Rosenberger <ilu@...utronix.de>
Subject: Re: [PATCH 10/10] ARM: dts: Fix dm814x pinctrl address and mask

* Matthijs van Duin <matthijsvanduin@...il.com> [151201 17:23]:
> On 2 December 2015 at 01:46, Tony Lindgren <tony@...mide.com> wrote:
> > We should probably have separate PIN_INPUT_3V3 and PIN_OUTPUT_3V3
> > dts macros that ensure that?
> 
> I'm in general no fan of such macros: it feels really awkward to have
> to make that distinction in dts when doing pin config.
> 
> Note that if you're feeling really enthausiastic about putting in
> effort to allow inputs to be disabled while staying clear of the
> erratum, I think you can detect at runtime which I/O supplies are 3.3V
> by inspecting this register:
> 
> #define CTRL_CQDETECT_STATUS    0x48140e00

OK and if really needed needed the SoC revision information can be
passed to pinctrl-singl.c in it's platform_data that we already have
in addition to the dts configuration. And then pinctrl-single.c could
modify the mask based on IO voltage and SoC revision.

I think we're already covered as the boards can override the pinctrl
function-mask in the board specific dts file if really needed :)

Regards,

Tony
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