pinctrl: sh-pfc: Add generic IOCTRL register description

Add a generic way to describe IOCTRL registers (for e.g. SD I/O voltage
and time delay control), like is already done for config, drive, and
bias registers.

This makes the sh-pfc core code aware of these registers, which will
ease introducing suspend/resume support later.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>

drivers/pinctrl/sh-pfc/sh_pfc.h

@@ -159,6 +159,10 @@ struct pinmux_bias_reg {
 	.pud = r2,	\
 	.pins =
 
+struct pinmux_ioctrl_reg {
+	u32 reg;
+};
+
 struct pinmux_data_reg {
 	u32 reg;
 	u8 reg_width;
@@ -251,6 +255,7 @@ struct sh_pfc_soc_info {
 	const struct pinmux_cfg_reg *cfg_regs;
 	const struct pinmux_drive_reg *drive_regs;
 	const struct pinmux_bias_reg *bias_regs;
+	const struct pinmux_ioctrl_reg *ioctrl_regs;
 	const struct pinmux_data_reg *data_regs;
 
 	const u16 *pinmux_data;