[PATCH v2 3/3] arm64: dts: allwinner: add Radxa Cubie A7S board

[Enzo Adriano <enzo.adriano.code@gmail.com>]

Supply the 26 MHz crystal and 32768 Hz RTC input, enable UART0 and the
AXP318W on R-I2C0, and describe the schematic's PMIC input/output and
CPU supply connections. Preserve firmware settings on rails whose
working voltage is not established. In particular, BLDO2 has no
programmed voltage constraint: its software 3.3 V selector does not
establish its physical output with the schematic's nominal 2.4 V input.

Describe the card's SWOUT2 supply and PF6 active-high detect with an
internal pull-down. Enable MMC0 at up to 50 MHz using 3.3 V signaling
only. Its high-voltage path uses VCCIO; CLDO5 also feeds PC and the PF
1.8 V input and must not be raised for SD signaling. Firmware must
select the 3.3 V PF path; dynamic voltage switching is not provided.
Keep other storage off.

Connect the documented bank supplies. PL's self-supply phandle is
omitted to avoid the PMIC/I2C/pinctrl bootstrap cycle, as on the
upstream Cubie A5E; ALDO1 is retained always-on. The separate pinctrl
fix is required so these connections do not trigger incompatible one-bit
bias programming.

AI assistance: Codex:gpt-6-astra.

Assisted-by: LLM
Signed-off-by: Enzo Adriano <enzo.adriano.code@gmail.com>
---
 arch/arm64/boot/dts/allwinner/Makefile        |   1 +
 .../dts/allwinner/sun60i-a733-cubie-a7s.dts   | 284 ++++++++++++++++++
 2 files changed, 285 insertions(+)
 create mode 100644 arch/arm64/boot/dts/allwinner/sun60i-a733-cubie-a7s.dts

diff --git a/arch/arm64/boot/dts/allwinner/Makefile b/arch/arm64/boot/dts/allwinner/Makefile
index d1f768dd6461d5a40537473fc62da6ba6a0d82c0..792152525b433b0caa5118ed2669f548835717e0 100644
--- a/arch/arm64/boot/dts/allwinner/Makefile
+++ b/arch/arm64/boot/dts/allwinner/Makefile
@@ -68,3 +68,4 @@ dtb-$(CONFIG_ARCH_SUNXI) += sun55i-a527-cubie-a5e.dtb
 dtb-$(CONFIG_ARCH_SUNXI) += sun55i-h728-x96qpro+.dtb
 dtb-$(CONFIG_ARCH_SUNXI) += sun55i-t527-avaota-a1.dtb
 dtb-$(CONFIG_ARCH_SUNXI) += sun55i-t527-orangepi-4a.dtb
+dtb-$(CONFIG_ARCH_SUNXI) += sun60i-a733-cubie-a7s.dtb
diff --git a/arch/arm64/boot/dts/allwinner/sun60i-a733-cubie-a7s.dts b/arch/arm64/boot/dts/allwinner/sun60i-a733-cubie-a7s.dts
new file mode 100644
index 0000000000000000000000000000000000000000..341c24360ce29e29f8fc4631924eaf48b7b1f809
--- /dev/null
+++ b/arch/arm64/boot/dts/allwinner/sun60i-a733-cubie-a7s.dts
@@ -0,0 +1,284 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR MIT)
+/dts-v1/;
+
+#include "sun60i-a733.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+	model = "Radxa Cubie A7S";
+	compatible = "radxa,cubie-a7s", "allwinner,sun60i-a733";
+
+	aliases {
+		mmc0 = &mmc0;
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	reg_ps: regulator-system-power {
+		compatible = "regulator-fixed";
+		regulator-name = "ps";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		regulator-always-on;
+	};
+
+	reg_ldo_input: regulator-ldo-input {
+		compatible = "regulator-fixed";
+		regulator-name = "ldo-input";
+		/* ETA3521: 0.6 V * (1 + RP298 / RP299), 30k / 10k. */
+		regulator-min-microvolt = <2400000>;
+		regulator-max-microvolt = <2400000>;
+		regulator-always-on;
+		vin-supply = <&reg_ps>;
+	};
+
+	osc32k: osc32k-clk {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <32768>;
+	};
+};
+
+&cpu0 {
+	cpu-supply = <&reg_dcdc5>;
+};
+
+&cpu1 {
+	cpu-supply = <&reg_dcdc5>;
+};
+
+&cpu2 {
+	cpu-supply = <&reg_dcdc5>;
+};
+
+&cpu3 {
+	cpu-supply = <&reg_dcdc5>;
+};
+
+&cpu4 {
+	cpu-supply = <&reg_dcdc5>;
+};
+
+&cpu5 {
+	cpu-supply = <&reg_dcdc5>;
+};
+
+&cpu6 {
+	cpu-supply = <&reg_dcdc3>;
+};
+
+&cpu7 {
+	cpu-supply = <&reg_dcdc3>;
+};
+
+&mmc0 {
+	bus-width = <4>;
+	cap-sd-highspeed;
+	cd-gpios = <&pio 5 6 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
+	disable-wp;
+	max-frequency = <50000000>;
+	no-1-8-v;
+	vmmc-supply = <&reg_swout2>;
+	/* The 3.3 V path uses VCC-IO; no Port F voltage switching yet. */
+	vqmmc-supply = <&reg_swout2>;
+	status = "okay";
+};
+
+&osc {
+	clock-frequency = <26000000>;
+};
+
+&pio {
+	vcc-pb-supply = <&reg_swout2>;
+	vcc-pc-supply = <&reg_cldo5>;
+	vcc-pd-supply = <&reg_swout1>;
+	vcc-pe-supply = <&reg_bldo1>;
+	vcc-pf-supply = <&reg_cldo5>;
+	vcc-pg-supply = <&reg_aldo1>;
+	vcc-ph-supply = <&reg_swout2>;
+	vcc-pj-supply = <&reg_swout1>;
+	vcc-pk-supply = <&reg_bldo1>;
+};
+
+&r_i2c0 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&r_i2c0_pl_pins>;
+
+	axp318w: pmic@36 {
+		compatible = "x-powers,axp318w";
+		reg = <0x36>;
+		interrupt-parent = <&nmi_intc>;
+		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+		interrupt-controller;
+		#interrupt-cells = <1>;
+
+		aldo156in-supply = <&reg_ps>;
+		aldo234in-supply = <&reg_aldo1>;
+		bldoin-supply = <&reg_ldo_input>;
+		cldoin-supply = <&reg_ldo_input>;
+		dldoin-supply = <&reg_ps>;
+		eldoin-supply = <&reg_dcdc9>;
+		ips-supply = <&reg_ps>;
+		vin19-supply = <&reg_ps>;
+		vin23-supply = <&reg_ps>;
+		vin45-supply = <&reg_ps>;
+		vin678-supply = <&reg_ps>;
+
+		regulators {
+			reg_dcdc1: dcdc1 {
+				regulator-name = "vcc-3v3";
+				regulator-min-microvolt = <3300000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-always-on;
+			};
+
+			reg_dcdc2: dcdc2 {
+				regulator-name = "vdd-sys";
+				regulator-always-on;
+			};
+
+			reg_dcdc3: dcdc3 {
+				regulator-name = "vdd-cpub";
+				regulator-always-on;
+			};
+
+			reg_dcdc4: dcdc4 {
+				regulator-name = "vdd-gpu";
+				regulator-always-on;
+			};
+
+			reg_dcdc5: dcdc5 {
+				regulator-name = "vdd-cpul";
+				regulator-always-on;
+			};
+
+			reg_dcdc6: dcdc6 {
+				regulator-name = "vcc-draml";
+				regulator-always-on;
+			};
+
+			reg_dcdc7: dcdc7 {
+				regulator-name = "vcc-dram";
+				regulator-always-on;
+			};
+
+			reg_dcdc8: dcdc8 {
+				regulator-name = "vcc-ufs-io";
+				regulator-always-on;
+			};
+
+			reg_dcdc9: dcdc9 {
+				regulator-name = "eldo-input";
+				regulator-always-on;
+			};
+
+			reg_swout1: swout1 {
+				regulator-name = "vcc33-lcd";
+				regulator-always-on;
+			};
+
+			reg_swout2: swout2 {
+				regulator-name = "vcc-io-card";
+				regulator-always-on;
+			};
+
+			reg_aldo1: aldo1 {
+				regulator-name = "vcc-pl";
+				regulator-min-microvolt = <3300000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-always-on;
+			};
+
+			reg_bldo1: bldo1 {
+				regulator-name = "vcc-pe-pk-mcsi";
+			};
+
+			reg_bldo2: bldo2 {
+				regulator-name = "vcc-lvds0";
+				regulator-always-on;
+			};
+
+			reg_bldo4: bldo4 {
+				regulator-name = "vcc18-codec";
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
+			};
+
+			reg_cldo1: cldo1 {
+				regulator-name = "vcc33-18-usb";
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
+				regulator-always-on;
+			};
+
+			reg_cldo2: cldo2 {
+				regulator-name = "vcc18-hdmi";
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
+			};
+
+			reg_cldo3: cldo3 {
+				regulator-name = "vcc-pll-dram";
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
+				regulator-always-on;
+			};
+
+			reg_cldo5: cldo5 {
+				regulator-name = "vcc18-pf-pc";
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
+				regulator-always-on;
+			};
+
+			reg_dldo1: dldo1 {
+				regulator-name = "vcc-efuse";
+				regulator-always-on;
+			};
+
+			reg_dldo6: dldo6 {
+				regulator-name = "vcc-ufs";
+				regulator-always-on;
+			};
+
+			reg_eldo1: eldo1 {
+				regulator-name = "vcc09-vdd2l";
+				regulator-always-on;
+			};
+
+			reg_eldo6: eldo6 {
+				regulator-name = "vdd-cpus";
+				regulator-always-on;
+			};
+
+			reg_rtc_ldo: rtc-ldo {
+				regulator-name = "vcc-rtc";
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
+				regulator-always-on;
+			};
+		};
+	};
+};
+
+&r_pio {
+	/* PL powers the PMIC bus itself; firmware must keep ALDO1 enabled. */
+	vcc-pm-supply = <&reg_aldo1>;
+};
+
+&rtc {
+	clocks = <&r_ccu CLK_BUS_R_RTC>, <&osc>, <&r_ccu CLK_R_AHB>,
+		 <&osc32k>;
+	clock-names = "bus", "hosc", "ahb", "ext-osc32k";
+};
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pb_pins>;
+	status = "okay";
+};
-- 
2.53.0