pinctrl: sh-pfc: r8a7795: Add I2C pin support

Since pinmuxing for I2C is equal on H3 ES1.0 and later versions, copy
the I2C settings from ES1.0. Fixes this error in upstream for
Salvator-XS:

sh-pfc e6060000.pin-controller: function 'i2c2' not supported
sh-pfc e6060000.pin-controller: invalid function i2c2 in map table
i2c-rcar: probe of e6510000.i2c failed with error -22

Now, the bus works the same as with other Salvator boards.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/pinctrl/sh-pfc/pfc-r8a7795.c

@@ -2076,6 +2076,57 @@ static const unsigned int du_disp_mux[] = {
 	DU_DISP_MARK,
 };
 
+/* - I2C -------------------------------------------------------------------- */
+static const unsigned int i2c1_a_pins[] = {
+	/* SDA, SCL */
+	RCAR_GP_PIN(5, 11), RCAR_GP_PIN(5, 10),
+};
+static const unsigned int i2c1_a_mux[] = {
+	SDA1_A_MARK, SCL1_A_MARK,
+};
+static const unsigned int i2c1_b_pins[] = {
+	/* SDA, SCL */
+	RCAR_GP_PIN(5, 24), RCAR_GP_PIN(5, 23),
+};
+static const unsigned int i2c1_b_mux[] = {
+	SDA1_B_MARK, SCL1_B_MARK,
+};
+static const unsigned int i2c2_a_pins[] = {
+	/* SDA, SCL */
+	RCAR_GP_PIN(5, 0), RCAR_GP_PIN(5, 4),
+};
+static const unsigned int i2c2_a_mux[] = {
+	SDA2_A_MARK, SCL2_A_MARK,
+};
+static const unsigned int i2c2_b_pins[] = {
+	/* SDA, SCL */
+	RCAR_GP_PIN(3, 13), RCAR_GP_PIN(3, 12),
+};
+static const unsigned int i2c2_b_mux[] = {
+	SDA2_B_MARK, SCL2_B_MARK,
+};
+static const unsigned int i2c6_a_pins[] = {
+	/* SDA, SCL */
+	RCAR_GP_PIN(1, 8), RCAR_GP_PIN(1, 11),
+};
+static const unsigned int i2c6_a_mux[] = {
+	SDA6_A_MARK, SCL6_A_MARK,
+};
+static const unsigned int i2c6_b_pins[] = {
+	/* SDA, SCL */
+	RCAR_GP_PIN(1, 26), RCAR_GP_PIN(1, 25),
+};
+static const unsigned int i2c6_b_mux[] = {
+	SDA6_B_MARK, SCL6_B_MARK,
+};
+static const unsigned int i2c6_c_pins[] = {
+	/* SDA, SCL */
+	RCAR_GP_PIN(0, 15), RCAR_GP_PIN(0, 14),
+};
+static const unsigned int i2c6_c_mux[] = {
+	SDA6_C_MARK, SCL6_C_MARK,
+};
+
 /* - MSIOF0 ----------------------------------------------------------------- */
 static const unsigned int msiof0_clk_pins[] = {
 	/* SCK */
@@ -3578,6 +3629,13 @@ static const struct sh_pfc_pin_group pinmux_groups[] = {
 	SH_PFC_PIN_GROUP(du_oddf),
 	SH_PFC_PIN_GROUP(du_cde),
 	SH_PFC_PIN_GROUP(du_disp),
+	SH_PFC_PIN_GROUP(i2c1_a),
+	SH_PFC_PIN_GROUP(i2c1_b),
+	SH_PFC_PIN_GROUP(i2c2_a),
+	SH_PFC_PIN_GROUP(i2c2_b),
+	SH_PFC_PIN_GROUP(i2c6_a),
+	SH_PFC_PIN_GROUP(i2c6_b),
+	SH_PFC_PIN_GROUP(i2c6_c),
 	SH_PFC_PIN_GROUP(msiof0_clk),
 	SH_PFC_PIN_GROUP(msiof0_sync),
 	SH_PFC_PIN_GROUP(msiof0_ss1),
@@ -3863,6 +3921,22 @@ static const char * const du_groups[] = {
 	"du_disp",
 };
 
+static const char * const i2c1_groups[] = {
+	"i2c1_a",
+	"i2c1_b",
+};
+
+static const char * const i2c2_groups[] = {
+	"i2c2_a",
+	"i2c2_b",
+};
+
+static const char * const i2c6_groups[] = {
+	"i2c6_a",
+	"i2c6_b",
+	"i2c6_c",
+};
+
 static const char * const msiof0_groups[] = {
 	"msiof0_clk",
 	"msiof0_sync",
@@ -4152,6 +4226,9 @@ static const struct sh_pfc_function pinmux_functions[] = {
 	SH_PFC_FUNCTION(drif2),
 	SH_PFC_FUNCTION(drif3),
 	SH_PFC_FUNCTION(du),
+	SH_PFC_FUNCTION(i2c1),
+	SH_PFC_FUNCTION(i2c2),
+	SH_PFC_FUNCTION(i2c6),
 	SH_PFC_FUNCTION(msiof0),
 	SH_PFC_FUNCTION(msiof1),
 	SH_PFC_FUNCTION(msiof2),