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Add debugfs support for exercising System Controller mailbox
interface from userspace. This adds the "sc/" debugfs root
directory and a "loopback" entry that sends an arbitrary byte
payload to the Core group's inverted-loopback command (group=0xFF,
cmd=0x03) and reports the response:
echo "0x11 0x22 0x33 0x44" > /sys/kernel/debug/dri/0/sc/loopback
cat /sys/kernel/debug/dri/0/sc/loopback
Signed-off-by: Anoop Vijay <anoop.c.vijay@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/20260930133451.667270-6-anoop.c.vijay@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
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