arm64: dts: renesas: r8a77990-ebisu: Add BD9571 PMIC

This patch adds the regulator definition required for operation of
S2RAM.
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/r8a77990-ebisu.dts

@@ -449,6 +449,26 @@ cs2000: clk-multiplier@4f {
 	};
 };
 
+&i2c_dvfs {
+	status = "okay";
+
+	clock-frequency = <400000>;
+
+	pmic: pmic@30 {
+		pinctrl-0 = <&irq0_pins>;
+		pinctrl-names = "default";
+
+		compatible = "rohm,bd9571mwv";
+		reg = <0x30>;
+		interrupt-parent = <&intc_ex>;
+		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
+};
+
 &lvds0 {
 	status = "okay";
 
@@ -511,6 +531,11 @@ du_pins: du {
 		function = "du";
 	};
 
+	irq0_pins: irq0 {
+		groups = "intc_ex_irq0";
+		function = "intc_ex";
+	};
+
 	pwm3_pins: pwm3 {
 		groups = "pwm3_b";
 		function = "pwm3";