pinctrl: sh-pfc: Rollback to mux if required when the gpio is freed
Some drivers require switching between function and gpio at run-time. Allow to roll back from gpio to mux when the gpio is freed. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Reviewed-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
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