ARM: dts: aspeed: Add Delta AHE-50DC BMC

This is a 1U Open19 power shelf with six PSUs and 50 12VDC outputs via
LM25066 efuses. It's managed by a pair of AST1250 BMCs in a redundant
active/active configuration using a PCA9541 on each I2C bus to
arbitrate access between the two.

Signed-off-by: Zev Weiss <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Joel Stanley <[e-mail]>

arch/arm/boot/dts/Makefile

···
 	aspeed-bmc-asrock-e3c246d4i.dtb \
 	aspeed-bmc-asrock-romed8hm3.dtb \
 	aspeed-bmc-bytedance-g220a.dtb \
+	aspeed-bmc-delta-ahe50dc.dtb \
 	aspeed-bmc-facebook-bletchley.dtb \
 	aspeed-bmc-facebook-cloudripper.dtb \
 	aspeed-bmc-facebook-cmm.dtb \

arch/arm/boot/dts/aspeed-bmc-delta-ahe50dc.dts

···
+// SPDX-License-Identifier: GPL-2.0+
+/dts-v1/;
+
+#include "aspeed-g4.dtsi"
+#include <dt-bindings/gpio/aspeed-gpio.h>
+
+#define EFUSE_OUTPUT(n)					\
+	efuse##n {					\
+		compatible = "regulator-output";	\
+		vout-supply = <&efuse##n>;		\
+	}
+
+#define __stringify(x) #x
+
+#define EFUSE(hexaddr, num)							\
+	efuse@##hexaddr {							\
+		compatible = "lm25066";						\
+		reg = <0x##hexaddr>;						\
+		shunt-resistor-micro-ohms = <675>;				\
+		regulators {							\
+			efuse##num: vout0 {					\
+				regulator-name = __stringify(efuse##num##-reg);	\
+			};							\
+		};								\
+	}
+
+/{
+	model = "Delta Power AHE-50DC";
+	compatible = "delta,ahe50dc-bmc", "aspeed,ast2400";
+
+	aliases {
+		serial4 = &uart5;
+
+		/*
+		 * pca9541-arbitrated logical i2c buses are numbered as the
+		 * corresponding physical bus plus 20
+		 */
+		i2c20 = &i2carb0;
+		i2c21 = &i2carb1;
+		i2c22 = &i2carb2;
+		i2c23 = &i2carb3;
+		i2c24 = &i2carb4;
+		i2c26 = &i2carb6;
+		i2c27 = &i2carb7;
+		i2c28 = &i2carb8;
+		i2c32 = &i2carb12;
+	};
+
+	chosen {
+		stdout-path = &uart3;
+		bootargs = "console=ttyS2,115200n8 earlycon";
+	};
+
+	memory@40000000 {
+		reg = <0x40000000 0x10000000>;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		heartbeat {
+			gpios = <&gpio ASPEED_GPIO(P, 0) GPIO_ACTIVE_HIGH>;
+			linux,default-trigger = "heartbeat";
+		};
+
+		panic {
+			gpios = <&gpio ASPEED_GPIO(P, 2) GPIO_ACTIVE_HIGH>;
+			linux,default-trigger = "panic";
+		};
+	};
+
+	iio-hwmon {
+		compatible = "iio-hwmon";
+		io-channels = <&adc 0>, <&adc 1>, <&adc 2>, <&adc 3>, <&adc 4>,
+			<&adc 5>, <&adc 6>, <&adc 7>, <&adc 8>, <&adc 9>;
+	};
+
+	EFUSE_OUTPUT(01);
+	EFUSE_OUTPUT(02);
+	EFUSE_OUTPUT(03);
+	EFUSE_OUTPUT(04);
+	EFUSE_OUTPUT(05);
+	EFUSE_OUTPUT(06);
+	EFUSE_OUTPUT(07);
+	EFUSE_OUTPUT(08);
+	EFUSE_OUTPUT(09);
+	EFUSE_OUTPUT(10);
+	EFUSE_OUTPUT(11);
+	EFUSE_OUTPUT(12);
+	EFUSE_OUTPUT(13);
+	EFUSE_OUTPUT(14);
+	EFUSE_OUTPUT(15);
+	EFUSE_OUTPUT(16);
+	EFUSE_OUTPUT(17);
+	EFUSE_OUTPUT(18);
+	EFUSE_OUTPUT(19);
+	EFUSE_OUTPUT(20);
+	EFUSE_OUTPUT(21);
+	EFUSE_OUTPUT(22);
+	EFUSE_OUTPUT(23);
+	EFUSE_OUTPUT(24);
+	EFUSE_OUTPUT(25);
+	EFUSE_OUTPUT(26);
+	EFUSE_OUTPUT(27);
+	EFUSE_OUTPUT(28);
+	EFUSE_OUTPUT(29);
+	EFUSE_OUTPUT(30);
+	EFUSE_OUTPUT(31);
+	EFUSE_OUTPUT(32);
+	EFUSE_OUTPUT(33);
+	EFUSE_OUTPUT(34);
+	EFUSE_OUTPUT(35);
+	EFUSE_OUTPUT(36);
+	EFUSE_OUTPUT(37);
+	EFUSE_OUTPUT(38);
+	EFUSE_OUTPUT(39);
+	EFUSE_OUTPUT(40);
+	EFUSE_OUTPUT(41);
+	EFUSE_OUTPUT(42);
+	EFUSE_OUTPUT(43);
+	EFUSE_OUTPUT(44);
+	EFUSE_OUTPUT(45);
+	EFUSE_OUTPUT(46);
+	EFUSE_OUTPUT(47);
+	EFUSE_OUTPUT(48);
+	EFUSE_OUTPUT(49);
+	EFUSE_OUTPUT(50);
+
+};
+
+&fmc {
+	status = "okay";
+
+	flash@0 {
+		status = "okay";
+		m25p,fast-read;
+		label = "flash0";
+		spi-max-frequency = <50000000>; // 50 MHz
+#include "openbmc-flash-layout.dtsi"
+	};
+};
+
+&uart3 {
+	status = "okay";
+};
+
+&mac1 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_rgmii2_default &pinctrl_mdio2_default>;
+};
+
+&i2c0 {
+	status = "okay";
+	bus-frequency = <200000>;
+
+	pca9541@79 {
+		compatible = "nxp,pca9541";
+		reg = <0x79>;
+
+		i2carb0: i2c-arb {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			/* lm25066 efuses @ 10-17, 40-47, 50-57 */
+			EFUSE(10, 03);
+			EFUSE(11, 04);
+			EFUSE(12, 01);
+			EFUSE(13, 02);
+			EFUSE(14, 13);
+			EFUSE(15, 14);
+			EFUSE(16, 15);
+			EFUSE(17, 16);
+			EFUSE(40, 12);
+			EFUSE(41, 11);
+			EFUSE(42, 10);
+			EFUSE(43, 09);
+			EFUSE(44, 08);
+			EFUSE(45, 07);
+			EFUSE(46, 05);
+			EFUSE(47, 06);
+			EFUSE(50, 17);
+			EFUSE(51, 18);
+			EFUSE(52, 20);
+			EFUSE(53, 19);
+			EFUSE(54, 22);
+			EFUSE(55, 21);
+			EFUSE(56, 24);
+			EFUSE(57, 23);
+		};
+	};
+};
+
+&i2c1 {
+	status = "okay";
+	bus-frequency = <200000>;
+
+	pca9541@72 {
+		compatible = "nxp,pca9541";
+		reg = <0x72>;
+
+		i2carb1: i2c-arb {
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+};
+
+&i2c2 {
+	status = "okay";
+	bus-frequency = <200000>;
+
+	pca9541@73 {
+		compatible = "nxp,pca9541";
+		reg = <0x73>;
+
+		i2carb2: i2c-arb {
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+};
+
+&i2c3 {
+	status = "okay";
+	bus-frequency = <200000>;
+
+	pca9541@74 {
+		compatible = "nxp,pca9541";
+		reg = <0x74>;
+
+		i2carb3: i2c-arb {
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+};
+
+&i2c4 {
+	status = "okay";
+	bus-frequency = <200000>;
+
+	pca9541@7a {
+		compatible = "nxp,pca9541";
+		reg = <0x7a>;
+
+		i2carb4: i2c-arb {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			gpio@20 {
+				compatible = "nxp,pca9534";
+				reg = <0x20>;
+				gpio-controller;
+				#gpio-cells = <2>;
+			};
+
+			/* lm25066 efuses @ 10-17, 40-47, 50-57, 59, 5a */
+			EFUSE(10, 27);
+			EFUSE(11, 28);
+			EFUSE(12, 25);
+			EFUSE(13, 26);
+			EFUSE(14, 37);
+			EFUSE(15, 38);
+			EFUSE(16, 39);
+			EFUSE(17, 40);
+			EFUSE(40, 36);
+			EFUSE(41, 35);
+			EFUSE(42, 34);
+			EFUSE(43, 33);
+			EFUSE(44, 32);
+			EFUSE(45, 31);
+			EFUSE(46, 29);
+			EFUSE(47, 30);
+			EFUSE(50, 41);
+			EFUSE(51, 42);
+			EFUSE(52, 44);
+			EFUSE(53, 43);
+			EFUSE(54, 46);
+			EFUSE(55, 45);
+			EFUSE(56, 48);
+			EFUSE(57, 47);
+			EFUSE(59, 49);
+			EFUSE(5a, 50);
+		};
+	};
+};
+
+&i2c6 {
+	status = "okay";
+	bus-frequency = <200000>;
+
+	pca9541@75 {
+		compatible = "nxp,pca9541";
+		reg = <0x75>;
+
+		i2carb6: i2c-arb {
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+};
+
+&i2c7 {
+	status = "okay";
+	bus-frequency = <200000>;
+
+	pca9541@76 {
+		compatible = "nxp,pca9541";
+		reg = <0x76>;
+
+		i2carb7: i2c-arb {
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+};
+
+&i2c8 {
+	status = "okay";
+	bus-frequency = <200000>;
+
+	pca9541@7c {
+		compatible = "nxp,pca9541";
+		reg = <0x7c>;
+
+		i2carb8: i2c-arb {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			fancontrol@30 {
+				compatible = "delta,ahe50dc-fan";
+				reg = <0x30>;
+			};
+
+			/* Baseboard FRU eeprom */
+			eeprom@50 {
+				compatible = "atmel,24c02";
+				reg = <0x50>;
+			};
+		};
+	};
+};
+
+&i2c12 {
+	status = "okay";
+	bus-frequency = <200000>;
+
+	pca9541@71 {
+		compatible = "nxp,pca9541";
+		reg = <0x71>;
+
+		i2carb12: i2c-arb {
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+};
+
+&gpio {
+	status = "okay";
+	gpio-line-names =
+		/*  A */ "", "", "", "", "", "", "", "",
+		/*  B */ "", "", "", "", "", "", "", "",
+		/*  C */ "RESET_PEER_N", "HEARTBEAT_OUT", "", "", "", "", "", "",
+		/*  D */ "", "", "", "", "", "", "", "",
+		/*  E */ "DOOM_N", "", "", "", "", "LED_PWR_BLUE", "", "",
+		/*  F */ "", "", "", "", "", "", "", "",
+		/*  G */ "", "", "", "", "", "", "", "",
+		/*  H */ "", "", "", "", "", "", "", "",
+		/*  I */ "", "", "", "", "", "", "", "",
+		/*  J */ "", "", "BMC_ID", "", "", "", "", "",
+		/*  K */ "", "", "", "", "", "", "", "",
+		/*  L */ "", "", "", "", "", "", "", "",
+		/*  M */ "", "", "", "", "", "", "", "",
+		/*  N */ "", "", "", "", "", "", "", "",
+		/*  O */ "", "", "", "", "", "", "", "",
+		/*  P */ "LED_GREEN", "", "LED_RED", "", "", "", "", "",
+		/*  Q */ "", "", "", "", "", "", "", "",
+		/*  R */ "", "", "", "", "", "", "", "",
+		/*  S */ "", "", "", "", "", "", "", "",
+		/*  T */ "", "", "", "", "", "", "", "",
+		/*  U */ "", "", "", "", "", "", "", "",
+		/*  V */ "", "", "", "", "", "", "", "",
+		/*  W */ "", "", "", "", "", "", "", "",
+		/*  X */ "", "", "", "", "", "", "", "",
+		/*  Y */ "HEARTBEAT_IN", "BOARDREV0", "BOARDREV1", "",
+		/*  Z */ "", "", "", "", "", "", "", "",
+		/* AA */ "", "", "", "", "", "", "", "",
+		/* AB */ "", "", "", "";
+
+	/*
+	 * I don't rightly know what this GPIO really *is*, but setting it to
+	 * zero causes the fans to run at full speed, after which setting it
+	 * back to one causes a power output glitch, so install a hog to keep
+	 * it at one as a failsafe to ensure nothing accidentally touches it.
+	 */
+	doom-guardrail {
+		gpio-hog;
+		gpios = <ASPEED_GPIO(E, 0) GPIO_ACTIVE_LOW>;
+		output-low;
+	};
+};
+
+&adc {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_adc0_default
+		&pinctrl_adc1_default
+		&pinctrl_adc2_default
+		&pinctrl_adc3_default
+		&pinctrl_adc4_default
+		&pinctrl_adc5_default
+		&pinctrl_adc6_default
+		&pinctrl_adc7_default
+		&pinctrl_adc8_default
+		&pinctrl_adc9_default>;
+};