linux-kernel - Re: [PATCH/RFC 5/6] staging: board: Add support for devices with complex dependencies

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Message-ID: <CAMuHMdWsc=2QvKfpYmN=M6As_KWENW2nhSqa8ajkZrQFe+dCPw@mail.gmail.com>
Date:	Sun, 5 Apr 2015 11:00:56 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Geert Uytterhoeven <geert+renesas@...der.be>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Magnus Damm <damm+renesas@...nsource.se>,
	Arnd Bergmann <arnd@...db.de>,
	Simon Horman <horms+renesas@...ge.net.au>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Marc Zyngier <marc.zyngier@....com>,
	driverdevel <devel@...verdev.osuosl.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC 5/6] staging: board: Add support for devices with
 complex dependencies

Hi Laurent,

On Sat, Apr 4, 2015 at 2:46 PM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>> +     for (i = 0; i < dev->ngpios; i++)
>> +             gpio_request_one(dev->gpios[i].gpio, dev->gpios[i].flags,
>> +                              pdev->name);
>
> Aren't GPIO numbers dynamic too in DT-based systems ? Beside, shouldn't it be

Apparently not, as the old legacy number still works, and it doesn't work
without.

> the responsibility of the drievr to request the GPIOs it needs ?

As far as I understand it, on Armadillo this is used more for platform
configuration than for device configuration, as it affects multiple devices
(the comment says DBGMD/LCDC0/FSIA MUX).

I guess I could use a "gpio-hog" subnode in DT instead, but then we're already
implementing the conversion to DT ;-)

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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