linux-kernel - Re: [PATCHv5 2/3] ARM: imx: Add gpio-keys to plat-mxc

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Message-ID: <19653.11169.583189.236012@ipc1.ka-ro>
Date:	Mon, 25 Oct 2010 09:02:57 +0200
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	Nguyen Dinh-R00091 <R00091@...escale.com>,
	amit.kucheria@...onical.com, linux@....linux.org.uk,
	s.hauer@...gutronix.de, linux-kernel@...r.kernel.org,
	grant.likely@...retlab.ca, valentin.longchamp@...l.ch,
	daniel@...aq.de, bryan.wu@...onical.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv5 2/3] ARM: imx: Add gpio-keys to plat-mxc

Hi Uwe,

Uwe Kleine-König writes:
> Hi Lothar,
> 
> On Sun, Oct 24, 2010 at 10:37:19AM +0200, Lothar Waßmann wrote:
> > Hi,
> > > >> How do you suggest I define this pin for Babbage board only? Do I add to iomux-mx51.h
> > > >> #define MX51_BABBAGE_PAD_EIM_A27__GPIO_2_21             IOMUX_PAD(0x45c, 0x0c8, 1, 0x0,
> > > >0,MX51_GPIO_PAD_CTRL | PAD_CTL_PUS_100K_UP) ?
> > > >>
> > > >> Or do I define the pin in the board file with a 100K_UP? Like how eukrea_mbimxsd-baseboard.c did for
> > > >MBIMXSD_GPIO_3_31?
> > > >I'd suggest something local to your machine file.  Unfortunately I don't
> > > >see an easy way to reuse the generic MX51_PAD_EIM_A27__GPIO_2_21 to
> > > >define your local symbol.  So I think something like you wrote above
> > > >should be fine.
> > > >
> > > >Too bad that
> > > >
> > > >	#define MX51_BABBAGE_PAD_EIM_A27__GPIO_2_21 (MX51_PAD_EIM_A27__GPIO_2_21 | PAD_CTL_PUS_100K_UP)
> > > >
> > > >doesn't work.
> > > 
> > > Yes, I also wish I didn't have to redefine the pin just because of PAD setting change. I am going to send out another patch that basically sets the pad_desc.pad_ctrl=PAD_SETTING in mxc_init_board() function. I think it's a bit cleaner than having to redefine the pin.
> > > 
> > IMO the 'struct pad_desc' should be replaced with an u64 bitmap that
> > would allow for the pullup and other definitions that may be board
> > specific to be simply or'ed to the pad definition.
> > 
> > I could try to provide a patch if this is agreed on.
> Hmm, I thought about that, too, when writing my mail and when I added
> the needed space for a struct pad_desc I stopped when it became >64.
> Somehow I must have got it wrong.  After rechecking now it's ==64, so
> yes, I'd like it.
> 
What kernel version should I base it on?
The master branch of git://git.pengutronix.de/git/imx/linux-2.6.git?


Lothar Waßmann
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