[PATCH] omap3: beagle: Use GPTIMERi 1 for clockevents

Sanjeev Premi premi at ti.com
Fri Jun 24 12:23:45 EDT 2011

The current selection of the GPTIMER on was result of
a hardware issue in early versions of the Beagleboards
(Ax and B1 thru B4). [1] [2]

Its been long since the hardware issue has been fixed.
This patch uses GPTIMER 1 for all newer board revisions
incl. Beagleboard XM.

 [1] http://thread.gmane.org/gmane.comp.hardware.beagleboard.general/91
 [2] Errata #7 at http://elinux.org/BeagleBoard#Errata

Signed-off-by: Sanjeev Premi <premi at ti.com>
Cc: Paul Walmsley <paul at pwsan.com>

  * The patch has been boot tested with Beagleboard-XM.
    Verified that GPTIMER1 is indeed being used.

  * Browsing through the code, it appears that similar
    change could be applied for these boards:
     - devkit8000
     - omap3stalker
     - omap3touchbook
    However, I don't have access to any of these;
    or information on their revisions.
    I can update this patch based on confirmations.

 arch/arm/mach-omap2/board-omap3beagle.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index 4b113b2..edc1596 100644
--- a/arch/arm/mach-omap2/board-omap3beagle.c
+++ b/arch/arm/mach-omap2/board-omap3beagle.c
@@ -509,7 +509,10 @@ static void __init omap3_beagle_init_irq(void)
-	omap2_gp_clockevent_set_gptimer(12);
+	if (omap3_beagle_version == OMAP3BEAGLE_BOARD_AXBX)
+		omap2_gp_clockevent_set_gptimer(12);
+	else
+		omap2_gp_clockevent_set_gptimer(1);

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