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

Message ID 20250318230042.3138542-1-sbellary@baylibre.com
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Series PM: TI: AM335x: PM STANDBY fixes | expand

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Sukrut Bellary March 18, 2025, 11 p.m. UTC 
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

Sukrut Bellary (4):
  ARM: OMAP2+: Fix l4ls clk domain handling in STANDBY
  pmdomain: ti: Fix STANDBY handling of PER power domain
  ARM: dts: am335x: Set wakeup-source for UART0
  ARM: multi_v7_defconfig: Enable am335x PM configs

 arch/arm/boot/dts/ti/omap/am335x-evm.dts    |  2 +-
 arch/arm/configs/multi_v7_defconfig         |  5 +++++
 arch/arm/mach-omap2/clockdomain.h           |  1 +
 arch/arm/mach-omap2/clockdomains33xx_data.c |  2 +-
 arch/arm/mach-omap2/cm33xx.c                | 14 +++++++++++++-
 drivers/pmdomain/ti/omap_prm.c              |  8 ++++++--
 6 files changed, 27 insertions(+), 5 deletions(-)