From: Tony Lindgren <tony@atomide.com>
To: John Faith <jfaith7@gmail.com>
Cc: linux-omap@vger.kernel.org
Subject: Re: Board mux entries ignored?
Date: Fri, 6 Aug 2010 12:06:32 +0300 [thread overview]
Message-ID: <20100806090631.GD23778@atomide.com> (raw)
In-Reply-To: <AANLkTinqEesHdt5jzUbJawEp7U6NsFwxe2=hjTg6C53n@mail.gmail.com>
* John Faith <jfaith7@gmail.com> [100805 19:09]:
> On Wed, Aug 4, 2010 at 11:54 PM, Tony Lindgren <tony@atomide.com> wrote:
> > * John Faith <jfaith7@gmail.com> [100804 22:22]:
> >> Hi,
> >> I'm trying to set mux modes for a 3530, package CBC in my board.c
> >> (2.6.32 kernel) using an omap_board_mux entry:
> >> OMAP3_MUX(GPMC_WAIT1, OMAP_MUX_MODE0 | OMAP_PIN_INPUT),
> >>
> >> , but sysfs reports mode4:
> >> # grep WAIT1 /sys/kernel/debug/omap_mux/board
> >> OMAP3_MUX(GPMC_WAIT1, OMAP_PIN_INPUT | OMAP_MUX_MODE4),
> >>
> >> I tried adding to bootargs "omap_mux=gpmc_wait1.gpmc_wait1=0x100", but
> >> still got MODE4. Doing "echo 0x100 >
> >> /sys/kernel/debug/omap_mux/gpmc_wait1" gave me MODE0, but I'd prefer
> >> to init pins in board.c. I've also noticed for pin SDMMC2_DAT3 that
> >> my OMAP3_MUX() entry specifies MODE1, but sysfs shows MODE4; it
> >> changed to MODE1 after adding:
> >> omap_mux_init_signal("mcspi3_cs0", OMAP_PIN_OUTPUT);
> >>
> >> Is just having the mode in omap_board_mux entries sufficient?
> >
> > Hmm that should be enough. Does dmesg | grep -i mux show any errors?
> >
> > You do have CONFIG_OMAP_MUX set, right? Otherwise omap_mux_init_signals
> > does not do anything, and the mux code just builds a list of GPIO
> > pins for PM runtime muxing (not implemented yet).
>
> Hi,
> Yes, CONFIG_OMAP_MUX is set. The only non-wait1 error I saw was:
> mux: Multiple signal paths (3) for mcspi3_cs0
>
> With CONFIG_OMAP_MUX_DEBUG I now see that after mode0 is set, later
> it's set to mode4:
> # dmesg | grep -i wait1
> mux: Setting signal gpmc_wait1.gpmc_wait1 0x0100 -> 0x0100
> mux: Setting signal gpmc_wait1.gpio63 0x0100 -> 0x0104
>
> The same pin was enabled for a different config, fixed with an ifdef.
OK, good to hear.
Tony
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prev parent reply other threads:[~2010-08-06 9:06 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-04 19:28 Board mux entries ignored? John Faith
2010-08-05 6:54 ` Tony Lindgren
2010-08-05 16:14 ` John Faith
2010-08-06 9:06 ` Tony Lindgren [this message]
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