[PATCH 06/10] arm64: dts: allwinner: h5: orange-pi-zero-plus2: Add CPU regulator supply

[Chen-Yu Tsai <wens@csie.org>]

The OrangePi Zero Plus 2 uses a fixed regulator to supply the CPU cores.
The feedback resistor network can be changed by toggling a GPIO line.
This is effectively a GPIO controlled regulator that can change between
roughly 1.1V and 1.3V. The actual voltage is slightly higher. The values
used in the device tree description are based on calculations using the
resistor values from the schematics.

Cc: Jagan Teki <jagan@amarulasolutions.com>
Cc: Sergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

---

This patch is based on the schematics and has not been tested on an
actual board.
---
 .../sun50i-h5-orangepi-zero-plus2.dts         | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus2.dts b/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus2.dts
index 53c8c11620e0..801c681307ef 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus2.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus2.dts
@@ -76,6 +76,22 @@
 		regulator-max-microvolt = <3300000>;
 	};
 
+	reg_vdd_cpux: vdd-cpux {
+		compatible = "regulator-gpio";
+		regulator-name = "vdd-cpux";
+		regulator-type = "voltage";
+		regulator-boot-on;
+		regulator-always-on;
+		regulator-min-microvolt = <1108475>;
+		regulator-max-microvolt = <1307810>;
+		regulator-ramp-delay = <50>; /* 4ms */
+		enable-gpios =  <&r_pio 0 8 GPIO_ACTIVE_HIGH>; /* PL8 */
+		gpios = <&r_pio 0 1 GPIO_ACTIVE_HIGH>; /* PL6 */
+		gpios-states = <0x1>;
+		states = <1108475 0x0
+			  1307810 0x1>;
+	};
+
 	wifi_pwrseq: wifi_pwrseq {
 		compatible = "mmc-pwrseq-simple";
 		pinctrl-names = "default";
@@ -84,6 +100,10 @@
 	};
 };
 
+&cpu0 {
+	cpu-supply = <&reg_vdd_cpux>;
+};
+
 &de {
 	status = "okay";
 };
-- 
2.20.1


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