Support Rev E of SC598 SoM

[pamolloy]

The Rev E of the SC598 SoM includes a different GPIO expander and larger SPI flash.

[UtsavAgarwalADI]

Nit: The SPL print doesnt seem to be there - which is expected for rev E.

Core:  143 devices, 24 uclasses, devicetree: embed
MMC:   mmc@310C7000: 0
Loading Environment from SPIFlash... SF: Detected is25lp01g with page size 256 Bytes, erase size 4 KiB, total 128 MiB
OK
In:    serial@0x31003000
Out:   serial@0x31003000
Err:   serial@0x31003000
Net:   eth0: eth0
Hit any key to stop autoboot:  0 

Otherwise, seems to be working, tested with mmcboot.

Also, do we want all these commits as part of rev E support?

[pamolloy]

Nit: The SPL print doesnt seem to be there - which is expected for rev E.

I don't think I've ever seen SPL print under normal conditions. When I reset from the U-Boot prompt it does since the GPIO expander is already initialized.

Core:  143 devices, 24 uclasses, devicetree: embed
MMC:   mmc@310C7000: 0
Loading Environment from SPIFlash... SF: Detected is25lp01g with page size 256 Bytes, erase size 4 KiB, total 128 MiB
OK
In:    serial@0x31003000
Out:   serial@0x31003000
Err:   serial@0x31003000
Net:   eth0: eth0
Hit any key to stop autoboot:  0 

Otherwise, seems to be working, tested with mmcboot.

Also, do we want all these commits as part of rev E support?

This is just a development branch (marked as draft), especially since it depends on Greg's series. And also Caleb is working on fixing the polarity as well.

I imagine the solution here of having rev D and rev E dtsi, and then only including rev E in the dts, makes the most sense, but open to other suggestions. Also interested to see what mainline thinks.

[pamolloy]

This should now contain the minimum required changes to boot on the Rev E. All of these changes would ideally be included in @gmalysa's series in the future. The one exception might be gpio: adp5588: Add ADP5587 as compatible, which could be sent to the mailing list independently.

@CalebEthridgeADI can you compare this with your changes? I'd like to drop the last commit on this branch that changes the polarity in favor of your changes. Ideally we would merge your changes into adi-u-boot-2025.07.y and then