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

From: Enzo Adriano

Date: Fri Oct 30 2026 - 22:29:22 EST

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@xxxxxxxxx>
---
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