arm64: dts: renesas: salvator-common: Add HSCIF1 device support

This patch adds pin control for HSCIF1, and supports connection with
Debug Serial-1 (CN26) on Salvator boards.

SCIF1 and HSCIF1 are sharing the pins connected to Debug Serial-1 (CN26)
on Salvator boards, and it is necessary to ensure that either SCIF1 or
HSCIF1 is enabled, not both.

As for the default of this DeviceTree, SCIF1 is connected.
Signed-off-by: Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@renesas.com>
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
[geert: Add missing "uart-has-rtscts"]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/salvator-common.dtsi

@@ -338,6 +338,15 @@ &extalr_clk {
 	clock-frequency = <32768>;
 };
 
+&hscif1 {
+	pinctrl-0 = <&hscif1_pins>;
+	pinctrl-names = "default";
+
+	uart-has-rtscts;
+	/* Please only enable hscif1 or scif1 */
+	/* status = "okay"; */
+};
+
 &hsusb {
 	dr_mode = "otg";
 	status = "okay";
@@ -543,6 +552,11 @@ du_pins: du {
 		function = "du";
 	};
 
+	hscif1_pins: hscif1 {
+		groups = "hscif1_data_a", "hscif1_ctrl_a";
+		function = "hscif1";
+	};
+
 	i2c2_pins: i2c2 {
 		groups = "i2c2_a";
 		function = "i2c2";
@@ -708,6 +722,7 @@ &scif1 {
 	pinctrl-names = "default";
 
 	uart-has-rtscts;
+	/* Please only enable hscif1 or scif1 */
 	status = "okay";
 };