sc5xx remoteproc cleanups

[ukleinek]

PR Description

Simplify and cleanup the drivers related to remoteproc operation. While working on these and understand their functions, simplifications help a lot make the picture clearer (and identify layer violations :-)).

PR Type

• Bug fix (a change that fixes an issue)
• New feature (a change that adds new functionality)
• Breaking change (a change that affects other repos or cause CIs to fail)

PR Checklist

• I have conducted a self-review of my own code changes
• I have compiled my changes, including the documentation
• I have tested the changes on the relevant hardware
• I have updated the documentation outside this repo accordingly
• I have provided links for the relevant upstream lore

[github-actions]

LLM review

This series is a janitorial cleanup of drivers/soc/adi/ (ADI SC5xx/SC59x mach code): marking
internally-used functions static, dropping unused exports, fixing a comment typo, and removing
the now-empty mach-sc59x/ directory.

Session: 32858449430

540f215d0ad6 - Drop empty mach-sc59x

Orphaned Kconfig symbol: drivers/soc/adi/mach-sc59x/{Makefile,core.c,core.h} and the
obj-$(CONFIG_ADI_MACH_SC59X) line are removed, but config ADI_MACH_SC59X is left in
drivers/soc/adi/Kconfig. A tree-wide grep shows nothing selects or references it any more, so it
is now a dead Kconfig option (still shown/settable, builds nothing). It should be dropped in the
same commit for consistency with the stated goal ("throwing that away doesn't hurt").

The b42d5e4fe4a1, 2b15323b3c0a, 7928f7431db7 (static/unused-function) and cbbd3d76ae76
(typo) commits were checked for external callers of the touched/removed functions across the
whole tree; none exist, so these are safe.

CI warnings

Both checkpatch warnings in the CI log are non-issues:

• "added, moved or deleted file(s), does MAINTAINERS need updating?" on 540f215d0ad6: the
  MAINTAINERS entry F: drivers/soc/adi/ already covers the removed mach-sc59x/ subdirectory
  as a wildcard, so no update is needed.
• "Missing commit description" on cbbd3d76ae76: cosmetic, the subject already fully describes
  the one-line typo fix.

Verification data

• Built drivers/soc/adi/ clean (no warnings) for arm64 (sc598-som-ezkit_defconfig) and arm
  (sc594-som-ezkit_defconfig) with set_arch gcc_aarch64 / set_arch gcc_arm.
• grep -rn across the tree confirmed no external users of the functions turned static or
  removed.
• Confirmed ADI_MACH_SC59X is unreferenced anywhere except its own now-orphaned config block,
  while ADI_MACH_SC5XX is still legitimately used by drivers/rpmsg/Kconfig and
  drivers/remoteproc/Kconfig.

Suggested patches

Apply the suggested patches with:

cd path/to/repository
export GITHUB_TOKEN=ghp_***
apply-patches --repo=analogdevicesinc/linux 32858449430

Install instructions

The following one-liner installs the script if not present already:

curl -fSsL "https://raw.githubusercontent.com/analogdevicesinc/doctools/refs/heads/main/ci/scripts/apply-patches.sh"      -o ~/.local/bin/apply-patches.sh &&   grep -q "/apply-patches.sh" ~/.bashrc || echo "source ~/.local/bin/apply-patches.sh" >> $_ ; . $_

More information at AI Usage.