pinctrl: mtmips: add support for MediaTek MT7621 SoC

This patch adds pinctrl support for MediaTek MT7621 SoC.
The MT7621 SoC supports pinconf, but it is not the same as mt7628.

Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/drivers/pinctrl/mtmips/pinctrl-mtmips-common.h b/drivers/pinctrl/mtmips/pinctrl-mtmips-common.h
index b51d8f0..1f1023e 100644
--- a/drivers/pinctrl/mtmips/pinctrl-mtmips-common.h
+++ b/drivers/pinctrl/mtmips/pinctrl-mtmips-common.h
@@ -22,6 +22,10 @@
 	u32 shift;
 	char mask;
 
+	int pconf_avail;
+	u32 pconf_reg;
+	u32 pconf_shift;
+
 	int nfuncs;
 	const struct mtmips_pmx_func *funcs;
 };
@@ -42,6 +46,14 @@
 	{ .name = (_name), .reg = (_reg), .shift = (_shift), .mask = (_mask), \
 	  .funcs = (_funcs), .nfuncs = ARRAY_SIZE(_funcs) }
 
+#define GRP_PCONF(_name, _funcs, _reg, _shift, _mask, _pconf_reg, _pconf_shift) \
+	{ .name = (_name), .reg = (_reg), .shift = (_shift), .mask = (_mask), \
+	  .funcs = (_funcs), .nfuncs = ARRAY_SIZE(_funcs), .pconf_avail = 1, \
+	  .pconf_reg = (_pconf_reg), .pconf_shift = (_pconf_shift) }
+
+void mtmips_pinctrl_reg_set(struct mtmips_pinctrl_priv *priv,
+			    u32 reg, u32 shift, u32 mask, u32 value);
+
 int mtmips_get_functions_count(struct udevice *dev);
 const char *mtmips_get_function_name(struct udevice *dev,
 				     unsigned int selector);