Re: [patch 2.6.29-rc3-omap-git] omap3: gpio pin config bugfixes

From: Tony Lindgren <tony@atomide.com>
To: Kim Kyuwon <chammoru@gmail.com>
Cc: David Brownell <david-b@pacbell.net>,
	OMAP <linux-omap@vger.kernel.org>,
	Manikandan Pillai <mani.pillai@ti.com>
Subject: Re: [patch 2.6.29-rc3-omap-git] omap3: gpio pin config bugfixes
Date: Wed, 11 Feb 2009 16:45:05 -0800	[thread overview]
Message-ID: <20090212004500.GG13748@atomide.com> (raw)
In-Reply-To: <4d34a0a70902090424n5e64a4fjeae8ce20bd4fafd0@mail.gmail.com>

* Kim Kyuwon <chammoru@gmail.com> [090209 04:25]:
> Hi,
> 
> On Mon, Feb 9, 2009 at 1:55 PM, David Brownell <david-b@pacbell.net> wrote:
> > From: David Brownell <dbrownell@users.sourceforge.net>
> >
> > Bugfix several GPIO mux configurations which didn't enable the
> > input drivers, but weren't named as e.g. ..._GPIO141_OUT.
> > These bugs were added quite recently, for OMAP3 EVM support.
> >
> > To help avoid such bugs in the future, update the comment to
> > clarify the rule:  always use PIN_INPUT, unless the name uses
> > that name suffix, to be crystal-clear on the signal's use as
> > output-only.
> >
> > (Also adds GPIO-63, for the EVM's MMC-1 writeprotect switch.
> > Presumably that works right...)
> >
> > Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
> > ---
> >
> >  arch/arm/mach-omap2/mux.c             |   13 ++++++++-----
> >  arch/arm/plat-omap/include/mach/mux.h |    1 +
> >  2 files changed, 9 insertions(+), 5 deletions(-)
> >
> > --- a/arch/arm/mach-omap2/mux.c
> > +++ b/arch/arm/mach-omap2/mux.c
> > @@ -453,6 +453,7 @@ MUX_CFG_34XX("AC1_3430_USB3FS_PHY_MM3_TX
> >
> >
> >  /* 34XX GPIO - bidirectional, unless the name has an "_OUT" suffix.
> > + * (Always specify PIN_INPUT, except for names suffixed by "_OUT".)
> >  * No internal pullup/pulldown without "_UP" or "_DOWN" suffix.
> >  */
> >  MUX_CFG_34XX("AH8_34XX_GPIO29", 0x5fa,
> > @@ -460,17 +461,19 @@ MUX_CFG_34XX("AH8_34XX_GPIO29", 0x5fa,
> >  MUX_CFG_34XX("J25_34XX_GPIO170", 0x1c6,
> >                OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_INPUT)
> >  MUX_CFG_34XX("AF26_34XX_GPIO0", 0x1e0,
> > -               OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_OUTPUT)
> > +               OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_INPUT)
> >  MUX_CFG_34XX("AF22_34XX_GPIO9", 0xa18,
> > -               OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_OUTPUT)
> > +               OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_INPUT)
> > +MUX_CFG_34XX("L8_34XX_GPIO63", 0x0ce,
> > +               OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_INPUT)
> >  MUX_CFG_34XX("AF6_34XX_GPIO140_UP", 0x16c,
> >                OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_INPUT_PULLUP)
> >  MUX_CFG_34XX("AE6_34XX_GPIO141", 0x16e,
> > -               OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_OUTPUT)
> > +               OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_INPUT)
> >  MUX_CFG_34XX("AF5_34XX_GPIO142", 0x170,
> > -               OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_OUTPUT)
> > +               OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_INPUT)
> >  MUX_CFG_34XX("AE5_34XX_GPIO143", 0x172,
> > -               OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_OUTPUT)
> > +               OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_INPUT)
> >
> >  };
> >
> 
> So the thing is, OMAP34XX_PIN_INPUT doens't mean input-only, but
> input-and-output. And OMAP34XX_PIN_OUTPUT doen't mean output, but output-only.
> Names of macros are really confusing me. Shouldn't we change names of these
> macros first? For example,
> OMAP34XX_PIN_INPUT -> OMAP34XX_PIN_INPUT_EN
> OMAP34XX_PIN_OUTPUT -> OMAP34XX_PIN_OUTPUT_ONLY

I like this idea to cut down on confusion.

Tony

> > --- a/arch/arm/plat-omap/include/mach/mux.h
> > +++ b/arch/arm/plat-omap/include/mach/mux.h
> > @@ -792,6 +792,7 @@ enum omap34xx_index {
> >        J25_34XX_GPIO170,
> >        AF26_34XX_GPIO0,
> >        AF22_34XX_GPIO9,
> > +       L8_34XX_GPIO63,
> >        AF6_34XX_GPIO140_UP,
> >        AE6_34XX_GPIO141,
> >        AF5_34XX_GPIO142,
> > --
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> >
> 
> 
> 
> -- 
> Kim Kyuwon
> --
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