On Sat, Dec 11, 2021 at 05:30:57PM +0200, Jarkko Nikula wrote:

Hi Tony

On 11/25/21 16:48, Tony Lindgren wrote:

quoted

Commit e428e250fde6 ("ARM: dts: Configure system timers for omap3")
caused a timer regression for beagleboard revision c where the system
clockevent stops working if omap3isp module is unloaded.

Turns out we still have beagleboard revisions a-b4 capacitor c70 quirks
applied that limit the usable timers for no good reason. This also affects
the power management as we use the system clock instead of the 32k clock
source.

Let's fix the issue by adding a new omap3-beagle-ab4.dts for the old timer
quirks. This allows us to remove the timer quirks for later beagleboard
revisions. We also need to update the related timer quirk check for the
correct compatible property.

Fixes: e428e250fde6 ("ARM: dts: Configure system timers for omap3")
Cc: linux-kernel@vger.kernel.org
Cc: Daniel Lezcano <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Rob Herring <robh+dt@kernel.org>
Reported-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---

quoted

 .../devicetree/bindings/arm/omap/omap.txt     |  3 ++
 arch/arm/boot/dts/Makefile                    |  1 +
 arch/arm/boot/dts/omap3-beagle-ab4.dts        | 47 +++++++++++++++++++
 arch/arm/boot/dts/omap3-beagle.dts            | 33 -------------
 drivers/clocksource/timer-ti-dm-systimer.c    |  2 +-
 5 files changed, 52 insertions(+), 34 deletions(-)
 create mode 100644 arch/arm/boot/dts/omap3-beagle-ab4.dts

I must have some error in my methodology since I cannot see the issue
being fixed with your patch :-(

Facepalm, as I was expecting I had error in my methodology... see below

cat arch/arm/boot/dts/omap3-beagle.dtb >>arch/arm/boot/zImage

This I used years before your patch and by some reason I confused to use
new omap3-beagle-ab4.dtb when testing your patch yesterday:

cat arch/arm/boot/dts/omap3-beagle-ab4.dtb >>arch/arm/boot/zImage

without realizing my Beagle Board version is not between A to B4 but C2.
So when using the omap3-beagle.dtb your patch fixes the regression I
found.

Tested-by: Jarkko Nikula <jarkko.nikula@bitmer.com>