pinctrl: sh-pfc: Add PINMUX_SINGLE()

Add a macro to describe a pinmux configuration for a single-function
pin.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

drivers/pinctrl/sh-pfc/sh_pfc.h

@@ -198,6 +198,14 @@ struct sh_pfc_soc_info {
 #define PINMUX_IPSR_MSEL(ipsr, fn, ms)					\
 	PINMUX_DATA(fn##_MARK, FN_##ms, FN_##ipsr, FN_##fn)
 
+/*
+ * Describe a pinmux configuration for a single-function pin with GPIO
+ * capability.
+ *   - fn: Function name
+ */
+#define PINMUX_SINGLE(fn)						\
+	PINMUX_DATA(fn##_MARK, FN_##fn)
+
 /*
  * GP port style (32 ports banks)
  */