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Document the Renesas Multifunctional Interface (MFIS) as found on the Renesas R-Car X5H (r8a78000) SoC. MFIS includes features like Mailbox/HW Spinlock/Product Register/Error Injection/Error Detection and the likes. Family-compatible values are not introduced here because MFIS is usually very different per SoC. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://patch.msgid.link/20260402112709.13002-2-wsa+renesas@sang-engineering.com Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>