Re: [PATCH 0/4] PM: TI: AM335x: PM STANDBY fixes

Hello Sukrut, Keven, Ulf,

On 3/18/25 6:00 PM, Sukrut Bellary wrote:

This patch series fixes the Power management issues on TI's am335x soc.

on AM335x, the wakeup doesn't work in the case of STANDBY.

1. Since CM3 PM FW [1](ti-v4.1.y) doesn't enable l4ls clockdomain upon
wakeup, it fails to wakeup the MPU.
To fix this, don't turn off the l4ls clk domain in the STANDBY transition
in MPU.

2. Also Per AM335x TRM [2](section 8.1.4.3 Power mode), in case of STANDBY,
PER domain should be ON. So fix PER power domain handling for
standby. l4ls is a part of the PER domain.

Since we are not turning off the l4ls clockdomain on STANDBY in MPU,
PER power domain would remain ON. But still, explicitly handle this
to be in sync with the STANDBY requirement.

3. On am335x evm[1], UART0 - (UART1-HW) has a wakeup capability.
Set the wakeup-source property in DT for AM335x.

4. Enable PM configs for AM335x.

[1] https://git.ti.com/cgit/processor-firmware/ti-amx3-cm3-pm-firmware/
[2] https://www.ti.com/lit/ug/spruh73q/spruh73q.pdf
[3] https://www.ti.com/tool/TMDXEVM3358

Test log:
https://gist.github.com/sukrutb/bdbfd1220fe8578a9decf87d0bac6796

Thanks for the patches, Sukrut.

I was able to test this series on am335x EVM, baseline being rc5 next
branch: https://gist.github.com/jmenti/cda1675b5fc5844b6f065376e98026f5

Tested-by: Judith Mendez <redacted>

regards,
~ Judith