arch/arm/boot/dts/aspeed-bmc-tyan-s7106.dts - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /dts-v1/;

 #include "aspeed-g5.dtsi"
 #include <dt-bindings/gpio/aspeed-gpio.h>

 / {
 	model = "Tyan S7106 BMC";
 	compatible = "tyan,s7106-bmc", "aspeed,ast2500";

 	chosen {
 		stdout-path = &uart5;
 		bootargs = "console=ttyS4,115200 earlycon";
 	};

 	memory@80000000 {
 		device_type = "memory";
 		reg = <0x80000000 0x20000000>;
 	};

 	reserved-memory {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges;

 		p2a_memory: region@987f0000 {
 			no-map;
 			reg = <0x987f0000 0x00010000>; /* 64KB */
 		};

 		vga_memory: framebuffer@9f000000 {
 			no-map;
 			reg = <0x9f000000 0x01000000>; /* 16M */
 		};

 		gfx_memory: framebuffer {
 			size = <0x01000000>; /* 16M */
 			alignment = <0x01000000>;
 			compatible = "shared-dma-pool";
 			reusable;
 		};
 	};

 	leds {
 		compatible = "gpio-leds";

 		identify {
 			gpios = <&gpio ASPEED_GPIO(A, 2) GPIO_ACTIVE_LOW>;
 		};

 		heartbeat {
 			gpios = <&gpio ASPEED_GPIO(E, 7) GPIO_ACTIVE_LOW>;
 		};
 	};

 	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>, <&adc 10>, <&adc 11>,
 			<&adc 12>, <&adc 13>, <&adc 14>;
 	};

 	iio-hwmon-battery {
 		compatible = "iio-hwmon";
 		io-channels = <&adc 15>;
 	};
 };

 &fmc {
 	status = "okay";
 	flash@0 {
 		label = "bmc";
 		status = "okay";
 		m25p,fast-read;
 #include "openbmc-flash-layout.dtsi"
 	};
 };

 &spi1 {
 	status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_spi1_default>;

 	flash@0 {
 		status = "okay";
 		label = "pnor";
 		m25p,fast-read;
 	};
 };

 &uart1 {
 	/* Rear RS-232 connector */
 	status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_txd1_default
 			&pinctrl_rxd1_default>;
 };

 &uart2 {
 	/* RS-232 connector on header */
 	status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_txd2_default
 			&pinctrl_rxd2_default>;
 };

 &uart3 {
 	/* Alternative to vuart to internally connect (route) to uart1
 	 * when vuart cannot be used due to BIOS limitations.
 	 */
 	status = "okay";
 };

 &uart4 {
 	/* Alternative to vuart to internally connect (route) to the
 	 * external port usually used by uart1 when vuart cannot be
 	 * used due to BIOS limitations.
 	 */
 	status = "okay";
 };

 &uart5 {
 	/* BMC "debug" (console) UART; connected to RS-232 connector
 	 * on header; selectable via jumpers as alternative to uart2
 	 */
 	status = "okay";
 };

 &vuart {
 	status = "okay";
 };

 &lpc_ctrl {
 	status = "okay";
 };

 &p2a {
 	status = "okay";
 	memory-region = <&p2a_memory>;
 };

 &lpc_snoop {
 	status = "okay";
 	snoop-ports = <0x80>;
 };

 &adc {
 	status = "okay";
 };

 &vhub {
 	status = "okay";
 };

 &pwm_tacho {
 	status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_pwm0_default
 			&pinctrl_pwm1_default
 			&pinctrl_pwm3_default
 			&pinctrl_pwm4_default>;

 	/* CPU fan #0 */
 	fan@0 {
 		reg = <0x00>;
 		aspeed,fan-tach-ch = /bits/ 8 <0x00>;
 	};

 	/* CPU fan #1 */
 	fan@1 {
 		reg = <0x01>;
 		aspeed,fan-tach-ch = /bits/ 8 <0x01>;
 	};

 	/* PWM group for chassis fans #1, #2, #3 and #4  */
 	fan@2 {
 		reg = <0x03>;
 		aspeed,fan-tach-ch = /bits/ 8 <0x02>;
 	};

 	fan@3 {
 		reg = <0x03>;
 		aspeed,fan-tach-ch = /bits/ 8 <0x03>;
 	};

 	fan@4 {
 		reg = <0x03>;
 		aspeed,fan-tach-ch = /bits/ 8 <0x04>;
 	};

 	fan@5 {
 		reg = <0x03>;
 		aspeed,fan-tach-ch = /bits/ 8 <0x05>;
 	};

 	/* PWM group for chassis fans #5 and #6  */
 	fan@6 {
 		reg = <0x04>;
 		aspeed,fan-tach-ch = /bits/ 8 <0x06>;
 	};

 	fan@7 {
 		reg = <0x04>;
 		aspeed,fan-tach-ch = /bits/ 8 <0x07>;
 	};
 };

 &i2c0 {
 	status = "okay";

 	/* Hardware monitor with temperature sensors */
 	nct7802@28 {
 		compatible = "nuvoton,nct7802";
 		reg = <0x28>;
 	};

 	/* Also connected to:
 	 * - IPMB pin header
 	 * - CPU #0 memory error LED @ 0x3A
 	 * - CPU #1 memory error LED @ 0x3C
 	 */
 };

 &i2c1 {
 	/* Directly connected to PCH SMBUS #0 */
 	status = "okay";
 };

 &i2c2 {
 	status = "okay";

 	/* BMC EEPROM, incl. mainboard FRU */
 	eeprom@50 {
 		compatible = "atmel,24c256";
 		reg = <0x50>;
 	};

 	/* Also connected to:
 	 * - fan header
 	 * - mini-SAS HD connector
 	 * - SSATA SGPIO
 	 * - via switch (BMC_SMB3_PCH_IE_SML3_EN, active low)
 	 *   to PCH SMBUS #3
 	 */
 };

 &i2c3 {
 	status = "okay";

 	/* PSU1 FRU @ 0xA0 */
 	eeprom@50 {
 		compatible = "atmel,24c02";
 		reg = <0x50>;
 	};

 	/* PSU2 FRU @ 0xA2 */
 	eeprom@51 {
 		compatible = "atmel,24c02";
 		reg = <0x51>;
 	};

 	/* PSU1 @ 0xB0 */
 	power-supply@58 {
 		compatible = "pmbus";
 		reg = <0x58>;
 	};

 	/* PSU2 @ 0xB2 */
 	power-supply@59 {
 		compatible = "pmbus";
 		reg = <0x59>;
 	};

 	/* Also connected to:
 	 * - PCH SMBUS #1
 	 */
 };

 &i2c4 {
 	status = "okay";

 	/* Connected to:
 	 * - PCH SMBUS #2
 	 */

 	/* Connected via switch to:
 	 * - CPU #0 channels ABC VDDQ @ 0x80
 	 * - CPU #0 channels DEF VDDQ @ 0x81
 	 * - CPU #1 channels ABC VDDQ @ 0x82
 	 * - CPU #1 channels DEF VDDQ @ 0x83
 	 * - CPU #0 VCCIO & VMCP @ 0x52
 	 * - CPU #1 VCCIO & VMCP @ 0x53
 	 * - CPU #0 VCCIN @ 0xC0
 	 * - CPU #0 VSA @ 0xC2
 	 * - CPU #1 VCCIN @ 0xC4
 	 * - CPU #1 VSA @ 0xC6
 	 * - J110
 	 */
 };

 &i2c5 {
 	status = "okay";

 	/* Connected via switch (PCH_BMC_SMB_SW_P) to:
 	 * - mainboard FRU @ 0xAE
 	 * - XDP connector
 	 * - ME debug header
 	 * - clock buffer @ 0xD8
 	 * - i2c4 via switch (PCH_VR_SMBUS_SW_P; controlled by PCH)
 	 * - PCH SMBUS
 	 */
 };

 &i2c6 {
 	status = "okay";

 	/* Connected via switch (BMC_PE_SMB_EN_1_N) to
 	 * bus mux (selector BMC_PE_SMB_SW_BIT[1..0]) to:
 	 * - 0,0: PCIE slot 1, SMB #1
 	 * - 0,1: PCIE slot 1, SMB #2
 	 * - 1,0: PCIE slot 2, SMB #1
 	 * - 1,1: PCIE slot 2, SMB #2
 	 */

 	/* Connected via switch (BMC_PE_SMB_EN_2_N) to
 	 * bus mux (selector BMC_PE_SMB_SW_BIT[1..0]) to:
 	 * - 0,0: OCP0 (A) SMB
 	 * - 0,1: OCP0 (C) SMB
 	 * - 1,0: OCP1 (A) SMB
 	 * - 1,1: NC
 	 */
 };

 &i2c7 {
 	status = "okay";

 	/* Connected to:
 	 * - PCH SMBUS #4
 	 */
 };

 &i2c8 {
 	status = "okay";

 	/* Not connected */
 };

 &mac0 {
 	status = "okay";
 	use-ncsi;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_rmii1_default>;
 };

 &mac1 {
 	status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_rgmii2_default &pinctrl_mdio2_default>;
 };

 &ibt {
 	status = "okay";
 };

 &kcs1 {
 	status = "okay";
 	aspeed,lpc-io-reg = <0xca8>;
 };

 &kcs3 {
 	status = "okay";
 	aspeed,lpc-io-reg = <0xca2>;
 };

 /* Enable BMC VGA output to show an early (pre-BIOS) boot screen */
 &gfx {
 	status = "okay";
 	memory-region = <&gfx_memory>;
 };

 /* We're following the GPIO naming as defined at
  * https://github.com/openbmc/docs/blob/master/designs/device-tree-gpio-naming.md.
  *
  * Notes on led-identify and id-button:
  * - A physical button is connected to id-button which
  *   triggers the clock on a D flip-flop. The /Q output of the
  *   flip-flop drives its D input.
  * - The flip-flop's Q output drives led-identify which is
  *   connected to LEDs.
  * - With that, every button press toggles the LED between on and off.
  *
  * Notes on power-, reset- and nmi- button and control:
  * - The -button signals can be used to monitor physical buttons.
  * - The -control signals can be used to actuate the specific
  *   operation.
  * - In hardware, the -button signals are connected to the -control
  *   signals through drivers with the -control signals being
  *   protected through diodes.
  */
 &gpio {
 	status = "okay";
 	gpio-line-names =
 	/*A0*/		"",
 	/*A1*/		"",
 	/*A2*/		"led-identify", /* in/out: BMC_IDLED_ON_N */
 	/*A3*/		"",
 	/*A4*/		"",
 	/*A5*/		"",
 	/*A6*/		"",
 	/*A7*/		"",
 	/*B0-B7*/	"","","","","","","","",
 	/*C0*/		"",
 	/*C1*/		"",
 	/*C2*/		"",
 	/*C3*/		"",
 	/*C4*/		"id-button", /* in/out: BMC_IDBTN_IN_OUT_N */
 	/*C5*/		"post-complete", /* in: FM_BIOS_POST_CMPLT_N */
 	/*C6*/		"",
 	/*C7*/		"",
 	/*D0*/		"",
 	/*D1*/		"",
 	/*D2*/		"power-chassis-good", /* in: SYS_PWROK_BUF */
 	/*D3*/		"platform-reset", /* in: SYS_PLTRST_N */
 	/*D4*/		"",
 	/*D5*/		"",
 	/*D6*/		"",
 	/*D7*/		"",
 	/*E0*/		"power-button", /* in: BMC_PWBTN_IN_N */
 	/*E1*/		"power-chassis-control", /* out: BMC_PWRBTN_OUT_N */
 	/*E2*/		"reset-button", /* in: BMC_RSTBTN_IN_N */
 	/*E3*/		"reset-control", /* out: BMC_RSTBTN_OUT_N */
 	/*E4*/		"nmi-button", /* in: BMC_NMIBTN_IN_N */
 	/*E5*/		"nmi-control", /* out: BMC_NMIBTN_OUT_N */
 	/*E6*/		"",
 	/*E7*/		"led-heartbeat", /* out: BMC_HEARTBRAT_LED_N */
 	/*F0*/		"",
 	/*F1*/		"clear-cmos-control", /* out: BMC_CLR_CMOS_N */
 	/*F2*/		"",
 	/*F3*/		"",
 	/*F4*/		"led-fault", /* out: AST_HW_FAULT_N */
 	/*F5*/		"",
 	/*F6*/		"",
 	/*F7*/		"",
 	/*G0*/		"BMC_PE_SMB_EN_1_N", /* out */
 	/*G1*/		"BMC_PE_SMB_EN_2_N", /* out */
 	/*G2*/		"",
 	/*G3*/		"",
 	/*G4*/		"",
 	/*G5*/		"",
 	/*G6*/		"",
 	/*G7*/		"",
 	/*H0-H7*/	"","","","","","","","",
 	/*I0-I7*/	"","","","","","","","",
 	/*J0-J7*/	"","","","","","","","",
 	/*K0-K7*/	"","","","","","","","",
 	/*L0-L7*/	"","","","","","","","",
 	/*M0-M7*/	"","","","","","","","",
 	/*N0-N7*/	"","","","","","","","",
 	/*O0-O7*/	"","","","","","","","",
 	/*P0-P7*/	"","","","","","","","",
 	/*Q0*/		"",
 	/*Q1*/		"",
 	/*Q2*/		"",
 	/*Q3*/		"",
 	/*Q4*/		"BMC_PE_SMB_SW_BIT0", /* out */
 	/*Q5*/		"BMC_PE_SMB_SW_BIT1", /* out */
 	/*Q6*/		"",
 	/*Q7*/		"",
 	/*R0-R7*/	"","","","","","","","",
 	/*S0-S7*/	"","","","","","","","",
 	/*T0-T7*/	"","","","","","","","",
 	/*U0-U7*/	"","","","","","","","",
 	/*V0-V7*/	"","","","","","","","",
 	/*W0-W7*/	"","","","","","","","",
 	/*X0-X7*/	"","","","","","","","",
 	/*Y0-Y7*/	"","","","","","","","",
 	/*Z0-Z7*/	"","","","","","","","",
 	/*AA0*/		"",
 	/*AA1*/		"",
 	/*AA2*/		"",
 	/*AA3*/		"BMC_SMB3_PCH_IE_SML3_EN", /* out */
 	/*AA4*/		"",
 	/*AA5*/		"",
 	/*AA6*/		"",
 	/*AA7*/		"",
 	/*AB0-AB7*/	"","","","","","","","";
 };
	// SPDX-License-Identifier: GPL-2.0+
	/dts-v1/;

	#include "aspeed-g5.dtsi"
	#include <dt-bindings/gpio/aspeed-gpio.h>

	/ {
	model = "Tyan S7106 BMC";
	compatible = "tyan,s7106-bmc", "aspeed,ast2500";

	chosen {
	stdout-path = &uart5;
	bootargs = "console=ttyS4,115200 earlycon";
	};

	memory@80000000 {
	device_type = "memory";
	reg = <0x80000000 0x20000000>;
	};

	reserved-memory {
	#address-cells = <1>;
	#size-cells = <1>;
	ranges;

	p2a_memory: region@987f0000 {
	no-map;
	reg = <0x987f0000 0x00010000>; /* 64KB */
	};

	vga_memory: framebuffer@9f000000 {
	no-map;
	reg = <0x9f000000 0x01000000>; /* 16M */
	};

	gfx_memory: framebuffer {
	size = <0x01000000>; /* 16M */
	alignment = <0x01000000>;
	compatible = "shared-dma-pool";
	reusable;
	};
	};

	leds {
	compatible = "gpio-leds";

	identify {
	gpios = <&gpio ASPEED_GPIO(A, 2) GPIO_ACTIVE_LOW>;
	};

	heartbeat {
	gpios = <&gpio ASPEED_GPIO(E, 7) GPIO_ACTIVE_LOW>;
	};
	};

	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>, <&adc 10>, <&adc 11>,
	<&adc 12>, <&adc 13>, <&adc 14>;
	};

	iio-hwmon-battery {
	compatible = "iio-hwmon";
	io-channels = <&adc 15>;
	};
	};

	&fmc {
	status = "okay";
	flash@0 {
	label = "bmc";
	status = "okay";
	m25p,fast-read;
	#include "openbmc-flash-layout.dtsi"
	};
	};

	&spi1 {
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_spi1_default>;

	flash@0 {
	status = "okay";
	label = "pnor";
	m25p,fast-read;
	};
	};

	&uart1 {
	/* Rear RS-232 connector */
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_txd1_default
	&pinctrl_rxd1_default>;
	};

	&uart2 {
	/* RS-232 connector on header */
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_txd2_default
	&pinctrl_rxd2_default>;
	};

	&uart3 {
	/* Alternative to vuart to internally connect (route) to uart1
	* when vuart cannot be used due to BIOS limitations.
	*/
	status = "okay";
	};

	&uart4 {
	/* Alternative to vuart to internally connect (route) to the
	* external port usually used by uart1 when vuart cannot be
	* used due to BIOS limitations.
	*/
	status = "okay";
	};

	&uart5 {
	/* BMC "debug" (console) UART; connected to RS-232 connector
	* on header; selectable via jumpers as alternative to uart2
	*/
	status = "okay";
	};

	&vuart {
	status = "okay";
	};

	&lpc_ctrl {
	status = "okay";
	};

	&p2a {
	status = "okay";
	memory-region = <&p2a_memory>;
	};

	&lpc_snoop {
	status = "okay";
	snoop-ports = <0x80>;
	};

	&adc {
	status = "okay";
	};

	&vhub {
	status = "okay";
	};

	&pwm_tacho {
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_pwm0_default
	&pinctrl_pwm1_default
	&pinctrl_pwm3_default
	&pinctrl_pwm4_default>;

	/* CPU fan #0 */
	fan@0 {
	reg = <0x00>;
	aspeed,fan-tach-ch = /bits/ 8 <0x00>;
	};

	/* CPU fan #1 */
	fan@1 {
	reg = <0x01>;
	aspeed,fan-tach-ch = /bits/ 8 <0x01>;
	};

	/* PWM group for chassis fans #1, #2, #3 and #4 */
	fan@2 {
	reg = <0x03>;
	aspeed,fan-tach-ch = /bits/ 8 <0x02>;
	};

	fan@3 {
	reg = <0x03>;
	aspeed,fan-tach-ch = /bits/ 8 <0x03>;
	};

	fan@4 {
	reg = <0x03>;
	aspeed,fan-tach-ch = /bits/ 8 <0x04>;
	};

	fan@5 {
	reg = <0x03>;
	aspeed,fan-tach-ch = /bits/ 8 <0x05>;
	};

	/* PWM group for chassis fans #5 and #6 */
	fan@6 {
	reg = <0x04>;
	aspeed,fan-tach-ch = /bits/ 8 <0x06>;
	};

	fan@7 {
	reg = <0x04>;
	aspeed,fan-tach-ch = /bits/ 8 <0x07>;
	};
	};

	&i2c0 {
	status = "okay";

	/* Hardware monitor with temperature sensors */
	nct7802@28 {
	compatible = "nuvoton,nct7802";
	reg = <0x28>;
	};

	/* Also connected to:
	* - IPMB pin header
	* - CPU #0 memory error LED @ 0x3A
	* - CPU #1 memory error LED @ 0x3C
	*/
	};

	&i2c1 {
	/* Directly connected to PCH SMBUS #0 */
	status = "okay";
	};

	&i2c2 {
	status = "okay";

	/* BMC EEPROM, incl. mainboard FRU */
	eeprom@50 {
	compatible = "atmel,24c256";
	reg = <0x50>;
	};

	/* Also connected to:
	* - fan header
	* - mini-SAS HD connector
	* - SSATA SGPIO
	* - via switch (BMC_SMB3_PCH_IE_SML3_EN, active low)
	* to PCH SMBUS #3
	*/
	};

	&i2c3 {
	status = "okay";

	/* PSU1 FRU @ 0xA0 */
	eeprom@50 {
	compatible = "atmel,24c02";
	reg = <0x50>;
	};

	/* PSU2 FRU @ 0xA2 */
	eeprom@51 {
	compatible = "atmel,24c02";
	reg = <0x51>;
	};

	/* PSU1 @ 0xB0 */
	power-supply@58 {
	compatible = "pmbus";
	reg = <0x58>;
	};

	/* PSU2 @ 0xB2 */
	power-supply@59 {
	compatible = "pmbus";
	reg = <0x59>;
	};

	/* Also connected to:
	* - PCH SMBUS #1
	*/
	};

	&i2c4 {
	status = "okay";

	/* Connected to:
	* - PCH SMBUS #2
	*/

	/* Connected via switch to:
	* - CPU #0 channels ABC VDDQ @ 0x80
	* - CPU #0 channels DEF VDDQ @ 0x81
	* - CPU #1 channels ABC VDDQ @ 0x82
	* - CPU #1 channels DEF VDDQ @ 0x83
	* - CPU #0 VCCIO & VMCP @ 0x52
	* - CPU #1 VCCIO & VMCP @ 0x53
	* - CPU #0 VCCIN @ 0xC0
	* - CPU #0 VSA @ 0xC2
	* - CPU #1 VCCIN @ 0xC4
	* - CPU #1 VSA @ 0xC6
	* - J110
	*/
	};

	&i2c5 {
	status = "okay";

	/* Connected via switch (PCH_BMC_SMB_SW_P) to:
	* - mainboard FRU @ 0xAE
	* - XDP connector
	* - ME debug header
	* - clock buffer @ 0xD8
	* - i2c4 via switch (PCH_VR_SMBUS_SW_P; controlled by PCH)
	* - PCH SMBUS
	*/
	};

	&i2c6 {
	status = "okay";

	/* Connected via switch (BMC_PE_SMB_EN_1_N) to
	* bus mux (selector BMC_PE_SMB_SW_BIT[1..0]) to:
	* - 0,0: PCIE slot 1, SMB #1
	* - 0,1: PCIE slot 1, SMB #2
	* - 1,0: PCIE slot 2, SMB #1
	* - 1,1: PCIE slot 2, SMB #2
	*/

	/* Connected via switch (BMC_PE_SMB_EN_2_N) to
	* bus mux (selector BMC_PE_SMB_SW_BIT[1..0]) to:
	* - 0,0: OCP0 (A) SMB
	* - 0,1: OCP0 (C) SMB
	* - 1,0: OCP1 (A) SMB
	* - 1,1: NC
	*/
	};

	&i2c7 {
	status = "okay";

	/* Connected to:
	* - PCH SMBUS #4
	*/
	};

	&i2c8 {
	status = "okay";

	/* Not connected */
	};

	&mac0 {
	status = "okay";
	use-ncsi;
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_rmii1_default>;
	};

	&mac1 {
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_rgmii2_default &pinctrl_mdio2_default>;
	};

	&ibt {
	status = "okay";
	};

	&kcs1 {
	status = "okay";
	aspeed,lpc-io-reg = <0xca8>;
	};

	&kcs3 {
	status = "okay";
	aspeed,lpc-io-reg = <0xca2>;
	};

	/* Enable BMC VGA output to show an early (pre-BIOS) boot screen */
	&gfx {
	status = "okay";
	memory-region = <&gfx_memory>;
	};

	/* We're following the GPIO naming as defined at
	* https://github.com/openbmc/docs/blob/master/designs/device-tree-gpio-naming.md.
	*
	* Notes on led-identify and id-button:
	* - A physical button is connected to id-button which
	* triggers the clock on a D flip-flop. The /Q output of the
	* flip-flop drives its D input.
	* - The flip-flop's Q output drives led-identify which is
	* connected to LEDs.
	* - With that, every button press toggles the LED between on and off.
	*
	* Notes on power-, reset- and nmi- button and control:
	* - The -button signals can be used to monitor physical buttons.
	* - The -control signals can be used to actuate the specific
	* operation.
	* - In hardware, the -button signals are connected to the -control
	* signals through drivers with the -control signals being
	* protected through diodes.
	*/
	&gpio {
	status = "okay";
	gpio-line-names =
	/A0/ "",
	/A1/ "",
	/A2/ "led-identify", /* in/out: BMC_IDLED_ON_N */
	/A3/ "",
	/A4/ "",
	/A5/ "",
	/A6/ "",
	/A7/ "",
	/B0-B7/ "","","","","","","","",
	/C0/ "",
	/C1/ "",
	/C2/ "",
	/C3/ "",
	/C4/ "id-button", /* in/out: BMC_IDBTN_IN_OUT_N */
	/C5/ "post-complete", /* in: FM_BIOS_POST_CMPLT_N */
	/C6/ "",
	/C7/ "",
	/D0/ "",
	/D1/ "",
	/D2/ "power-chassis-good", /* in: SYS_PWROK_BUF */
	/D3/ "platform-reset", /* in: SYS_PLTRST_N */
	/D4/ "",
	/D5/ "",
	/D6/ "",
	/D7/ "",
	/E0/ "power-button", /* in: BMC_PWBTN_IN_N */
	/E1/ "power-chassis-control", /* out: BMC_PWRBTN_OUT_N */
	/E2/ "reset-button", /* in: BMC_RSTBTN_IN_N */
	/E3/ "reset-control", /* out: BMC_RSTBTN_OUT_N */
	/E4/ "nmi-button", /* in: BMC_NMIBTN_IN_N */
	/E5/ "nmi-control", /* out: BMC_NMIBTN_OUT_N */
	/E6/ "",
	/E7/ "led-heartbeat", /* out: BMC_HEARTBRAT_LED_N */
	/F0/ "",
	/F1/ "clear-cmos-control", /* out: BMC_CLR_CMOS_N */
	/F2/ "",
	/F3/ "",
	/F4/ "led-fault", /* out: AST_HW_FAULT_N */
	/F5/ "",
	/F6/ "",
	/F7/ "",
	/G0/ "BMC_PE_SMB_EN_1_N", /* out */
	/G1/ "BMC_PE_SMB_EN_2_N", /* out */
	/G2/ "",
	/G3/ "",
	/G4/ "",
	/G5/ "",
	/G6/ "",
	/G7/ "",
	/H0-H7/ "","","","","","","","",
	/I0-I7/ "","","","","","","","",
	/J0-J7/ "","","","","","","","",
	/K0-K7/ "","","","","","","","",
	/L0-L7/ "","","","","","","","",
	/M0-M7/ "","","","","","","","",
	/N0-N7/ "","","","","","","","",
	/O0-O7/ "","","","","","","","",
	/P0-P7/ "","","","","","","","",
	/Q0/ "",
	/Q1/ "",
	/Q2/ "",
	/Q3/ "",
	/Q4/ "BMC_PE_SMB_SW_BIT0", /* out */
	/Q5/ "BMC_PE_SMB_SW_BIT1", /* out */
	/Q6/ "",
	/Q7/ "",
	/R0-R7/ "","","","","","","","",
	/S0-S7/ "","","","","","","","",
	/T0-T7/ "","","","","","","","",
	/U0-U7/ "","","","","","","","",
	/V0-V7/ "","","","","","","","",
	/W0-W7/ "","","","","","","","",
	/X0-X7/ "","","","","","","","",
	/Y0-Y7/ "","","","","","","","",
	/Z0-Z7/ "","","","","","","","",
	/AA0/ "",
	/AA1/ "",
	/AA2/ "",
	/AA3/ "BMC_SMB3_PCH_IE_SML3_EN", /* out */
	/AA4/ "",
	/AA5/ "",
	/AA6/ "",
	/AA7/ "",
	/AB0-AB7/ "","","","","","","","";
	};