boards: atmel: samx7x add hsmci peripheral

[tuna-f1sh]

Adds samx7x hsmci peripheral according to datasheet sections 10-1 and 14.1: https://ww1.microchip.com/downloads/aemDocuments/documents/MCU32/ProductDocuments/DataSheets/SAM-E70-S70-V70-V71-Family-Data-Sheet-DS60001527.pdf

Updates sam_e70_xplained overlay to include pin mapping to the SD card connected to the hsmci and adds sdhc0 alias.

Relevant #18614

[nandojve]

BTW, how are you testing this ?

[tuna-f1sh]

Good question. I have a SAMV71 Xplained Ultra I've been building for so same family. I actually noticed I didn't change the board for that so have added a commit.

In terms of testing I tested basic build and disk access with the sam_v71_xult/samv71q21 which works. The fs_sample fails however mounting. Reading through #58233 it looks like this is known so perhaps there is more work to this PR to get mounting working on samx7x?

*** Booting Zephyr OS build v4.1.0-2-gf3c3d5c8e066 ***
[00:00:01.027,000] <inf> main: Block count 62333952
Sector size 512
Memory Size(MB) 30436
[00:00:13.722,000] <err> fs: fs mount error (-19)
Error mounting disk.
[00:00:13.722,000] <err> fs: fs not mounted (mp == 0x20400000)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[nandojve]

Hi @tuna-f1sh ,

In terms of testing I tested basic build and disk access with the sam_v71_xult/samv71q21 which works.

I think for the purpose of this PR the above is fine!
Thank you for bring the samv_71_xult too : )

Enjoy!

[tuna-f1sh]

Cool thanks. I agree and the mount issue might actually be my hardware since basic disk io seems to work.

The SD holder part is obsolete so I have a janky setup using an adaptor and wires 🫣. The wires could be creating issues at the hsmci speed.