MVEBU A38x Regulator

[Tony Dinh]

Hi Pali/Marek,

I'm writing u-boot for the Synology DS116 (Armada 385, dual core, 1.8
Ghz). I could not seem to get the DM Regulator to power up the SATA
port on this board. I'm using Stefan ./board/Marvell/db-88f6820-gp as
the starting point, and using the latest DTS

https://github.com/torvalds/linux/blob/master/arch/arm/boot/dts/armada-385-synology-ds116.dts

I noticed that the Linux kernel boot log (booted with stock Marvell
u-boot) shows "supply ahci not found" error. But I can power up the
SATA drive in stock u-boot by poking GPIO 15 (SATA power enable). And
it works fine with this combination: stock u-boot, kernel 5.18.6.

[    2.861061] usb_phy_generic usb3_0_phy: dummy supplies not allowed
for exclusive requests
[    2.870173] usb_phy_generic usb3_1_phy: dummy supplies not allowed
for exclusive requests
[    2.879296] ahci-mvebu f10a8000.sata: supply ahci not found, using
dummy regulator
[    2.887704] ahci-mvebu f10a8000.sata: supply phy not found, using
dummy regulator
[    2.896101] ahci-mvebu f10a8000.sata: masking port_map 0x3 -> 0x1
[    2.902951] ahci-mvebu f10a8000.sata: AHCI 0001.0000 32 slots 2
ports 6 Gbps 0x1 impl platform mode
[    2.912750] ahci-mvebu f10a8000.sata: flags: 64bit ncq sntf led
only pmp fbs pio slum part sxs
[    2.923184] scsi host0: ahci-mvebu
[    2.927693] scsi host1: ahci-mvebu
[    2.931935] ata1: SATA max UDMA/133 mmio [mem
0xf10a8000-0xf10a9fff] port 0x100 irq 50
[    2.940610] ata2: DUMMY

My questions: does DM regulator +  DM GPIO work for Armada 38x u-boot?
and is the error "ahci-mvebu f10a8000.sata: supply ahci, using dummy
regulator" a real error? I've googled this and came across some past
related posts from you (Pali and Marek), but it is not apparent what
was the solution.

If you are interested in seeing more info while I'm at my new u-boot
prompt (kwboot with the SPL kwb), I can post that followup.

Thanks,
Tony