[PATCH v17 0/3] pmdomain: rockchip: RK3576 NPU domain supply and settle delay

[Jiaxing Hu <gahing@gahingwoo.com>]

This series fixes how the Rockchip power-domain driver initializes
domains that need a regulator, adds proper regulator handling for the
RK3576 NPU power domain, and adds a settle wait after power-on for some
RK3576 power domains.

These are the pmdomain patches of the RK3576 NPU series, split out and
rebased on Ulf's next, as Ulf asked after dropping v15 7, 9 and 10:
https://lore.kernel.org/all/CAPx+jO-KKvgRS0br-3QGh6Jt4efWJ+A6YoRZKFV_bcfB+8sm6w@mail.gmail.com/

The accel/rocket and DT patches follow as their own v17:
https://lore.kernel.org/all/cover.1794615324.git.gahing@gahingwoo.com/

Based on: Ulf's next (844a13010b0b)

Changes in v17:

- Reorganized the series as Ulf asked, and split the fix for regulator
  domain initialization from the RK3576 NPU regulator handling.
- Following Finley Xiao's (Rockchip) review of v16, the RK3576 delay is
  now 15 us on NPUTOP and VOP only.
- Fixed the subdomains of a regulator domain being left in the wrong
  state at probe, reported by Vladimir Bely (1/3).
- The RK3576 NPU power domain uses DOMAIN_RK3576_R, the same macro
  Leonard Lausen's GPU patch added (2/3).

Testing:

Tested on a Radxa ROCK 4D, with these patches and the rest of v17
backported to Armbian's 7.3 kernel:

- With the NPU disabled in the DT, NPUTOP, NPU0 and NPU1 are switched
  off and idled at probe on every boot (16 boots). Without 1/3, all 14
  boots left them on, and one of them hung.
- With the NPU enabled, 30 NPU power-ups after a warm reboot and 30
  after a cold power-on, with identical output and no SError.

Logs: https://github.com/gahingwoo/linux-rk3576-npu/tree/main/board-logs

Tag changes:

- 3/3 changes the delay values of the v16 patch and is organized
  differently, so I've dropped Abel's and Heiko's Reviewed-by. Abel,
  Heiko, could you take another look?

Jiaxing Hu (3):
  pmdomain: rockchip: switch off the subdomains of a regulator domain at
    probe
  pmdomain: rockchip: manage the RK3576 NPU domain supply
  pmdomain: rockchip: settle RK3576 NPUTOP and VOP after power-on

 drivers/pmdomain/rockchip/pm-domains.c | 115 ++++++++++++++++++++++++---------
 1 file changed, 85 insertions(+), 30 deletions(-)


base-commit: 844a13010b0b93f8561ef2c088f843647d5e552d
-- 
2.43.0