MVEBU A38x Regulator

[Pali Rohár]

On Wednesday 20 July 2022 15:47:55 Tony Dinh wrote:
> 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.

I'm really not sure if DM regulator and DM GPIO is working in U-Boot for
Armada 38x. Lot of Armada boards touch pinctrl/gpio registers directory
to configure GPIOs, instead of using DM GPIO API.

Stefan, any idea?

> 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