Re: [PATCH v2 0/2] AM57 timer fixes

Jonathan Cormier <[email protected]> Wed, 3 Jun 2026 15:12:57 -0400

Newsgroups	org.kernel.vger.linux-omap,org.kernel.vger.linux-kernel
Message-ID	<[email protected]>

Tested this series on a Critical Link MitySOM-AM57x board (AM572x /
DRA752-GP, 20 MHz SYS_CLK1).  With counter_32k disabled and DMTimer 12
registered as the system clocksource via these patches, system clock
drift dropped from +553 ppm (counter_32k 32,787Hz instead of 32,768Hz)
to +2 ppm over a 50.8 h measurement window

  /sys/devices/system/clocksource/clocksource0/available_clocksource:
  dmtimer

Note: to make the fix apply to non-beagle-x15 DRA7/AM57 boards, I moved
the &timer12_target and &counter32k overrides from am57xx-beagle-x15.dts
into dra7.dtsi.  Worth considering for v3 so other boards (MitySOM,
am57xx-idk, AM572x-EVM, etc.) pick up the fix automatically rather than
each needing the same per-board override.

Tested-by: Jonathan Cormier <[email protected]>

Thanks,
Jonathan