ARM: dts: Adds device tree file for McGill's IceBoard, based on TI AM3874

This is an ARM + FPGA instrumentation board used at telescopes in
Antarctica, Chile, and Canada:

        https://pole.uchicago.edu/
        https://arxiv.org/abs/1608.03025
        https://chime-experiment.ca/

With these commits and a suitable userspace, we can boot the board, load
a FPGA bitstream, and communicate with the RTL design. Most of the board's
telemetry sensors (temperatures, voltages) are functional but detailed
testing is to follow.

We are weaning ourselves off TI's "official" kernel for this SOC, which
has been stuck at 2.6.37 and is not really fit for use. To anyone at TI:
despite good silicon and some dedicated support enginers, your
open-source software strategy for these parts has not worked well.
Please get in touch with me if you'd like to have a constructive
discussion about ways to improve it.
Signed-off-by: Graeme Smecher <gsmecher@threespeedlogic.com>
[tony@atomide.com: dropped fpga@1 as linux,spidev is still undocumented]
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/Makefile

@@ -700,6 +700,7 @@ dtb-$(CONFIG_ARCH_OMAP3) += \
 	omap3-thunder.dtb \
 	omap3-zoom3.dtb
 dtb-$(CONFIG_SOC_TI81XX) += \
+	am3874-iceboard.dtb \
 	dm8148-evm.dtb \
 	dm8148-t410.dtb \
 	dm8168-evm.dtb \

arch/arm/boot/dts/am3874-iceboard.dts

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device tree for Winterland IceBoard
+ *
+ * http://mcgillcosmology.com
+ * http://threespeedlogic.com
+ *
+ * This is an ARM + FPGA instrumentation board used at telescopes in
+ * Antarctica (the South Pole Telescope), Chile (POLARBEAR), and at the DRAO
+ * observatory in British Columbia (CHIME).
+ *
+ * Copyright (c) 2019 Three-Speed Logic, Inc. <gsmecher@threespeedlogic.com>
+ */
+
+/dts-v1/;
+
+#include "dm814x.dtsi"
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+	model = "Winterland IceBoard";
+	compatible = "ti,dm8148", "ti,dm814";
+
+	chosen {
+		stdout-path = "serial1:115200n8";
+		bootargs = "earlycon";
+	};
+
+	memory@80000000 {
+		device_type = "memory";
+		reg = <0x80000000 0x40000000>;	/* 1 GB */
+	};
+
+	vmmcsd_fixed: fixedregulator0 {
+		compatible = "regulator-fixed";
+		regulator-name = "vmmcsd_fixed";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
+};
+
+/* The MAC provides internal delay for the transmit path ONLY, which is enabled
+ * provided no -id/-txid/-rxid suffix is provided to "phy-mode".
+ *
+ * The receive path is delayed at the PHY. The recommended register settings
+ * are 0xf0 for the control bits, and 0x7777 for the data bits. However, the
+ * conversion code in the kernel lies: the PHY's registers are 120 ps per tap,
+ * and the kernel assumes 200 ps per tap. So we have fudged the numbers here to
+ * obtain the correct register settings.
+ */
+&mac { dual_emac = <1>; };
+&cpsw_emac0 {
+	phy-handle = <&ethphy0>;
+	phy-mode = "rgmii";
+	dual_emac_res_vlan = <1>;
+};
+&cpsw_emac1 {
+	phy-handle = <&ethphy1>;
+	phy-mode = "rgmii";
+	dual_emac_res_vlan = <2>;
+};
+
+&davinci_mdio {
+	ethphy0: ethernet-phy@0 {
+		reg = <0x2>;
+
+		rxc-skew-ps = <3000>;
+		rxdv-skew-ps = <0>;
+
+		rxd3-skew-ps = <0>;
+		rxd2-skew-ps = <0>;
+		rxd1-skew-ps = <0>;
+		rxd0-skew-ps = <0>;
+
+		phy-reset-gpios = <&gpio2 8 GPIO_ACTIVE_LOW>;
+	};
+
+	ethphy1: ethernet-phy@1 {
+		reg = <0x1>;
+
+		rxc-skew-ps = <3000>;
+		rxdv-skew-ps = <0>;
+
+		rxd3-skew-ps = <0>;
+		rxd2-skew-ps = <0>;
+		rxd1-skew-ps = <0>;
+		rxd0-skew-ps = <0>;
+
+		phy-reset-gpios = <&gpio2 1 GPIO_ACTIVE_LOW>;
+	};
+};
+
+&mmc1 { status = "disabled"; };
+&mmc2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&mmc2_pins>;
+	vmmc-supply = <&vmmcsd_fixed>;
+	bus-width = <4>;
+};
+&mmc3 { status = "disabled"; };
+
+&i2c1 {
+	/* Most I2C activity happens through this port, with the sole exception
+	 * of the backplane. Since there are multiply assigned addresses, the
+	 * "i2c-mux-idle-disconnect" is important.
+	 */
+
+	pca9548@70 {
+		compatible = "nxp,pca9548";
+		reg = <0x70>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		i2c@0 {
+			/* FMC A */
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0>;
+			i2c-mux-idle-disconnect;
+		};
+
+		i2c@1 {
+			/* FMC B */
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <1>;
+			i2c-mux-idle-disconnect;
+		};
+
+		i2c@2 {
+			/* QSFP A */
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <2>;
+			i2c-mux-idle-disconnect;
+		};
+
+		i2c@3 {
+			/* QSFP B */
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <3>;
+			i2c-mux-idle-disconnect;
+		};
+
+		i2c@4 {
+			/* SFP */
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <4>;
+			i2c-mux-idle-disconnect;
+		};
+
+		i2c@5 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <5>;
+			i2c-mux-idle-disconnect;
+
+			ina230@40 { compatible = "ti,ina230"; reg = <0x40>; shunt-resistor = <5000>; };
+			ina230@41 { compatible = "ti,ina230"; reg = <0x41>; shunt-resistor = <5000>; };
+			ina230@42 { compatible = "ti,ina230"; reg = <0x42>; shunt-resistor = <5000>; };
+
+			ina230@44 { compatible = "ti,ina230"; reg = <0x44>; shunt-resistor = <5000>; };
+			ina230@45 { compatible = "ti,ina230"; reg = <0x45>; shunt-resistor = <5000>; };
+			ina230@46 { compatible = "ti,ina230"; reg = <0x46>; shunt-resistor = <5000>; };
+
+			ina230@47 { compatible = "ti,ina230"; reg = <0x47>; shunt-resistor = <5500>; };
+			ina230@48 { compatible = "ti,ina230"; reg = <0x48>; shunt-resistor = <2360>; };
+			ina230@49 { compatible = "ti,ina230"; reg = <0x49>; shunt-resistor = <2360>; };
+			ina230@43 { compatible = "ti,ina230"; reg = <0x43>; shunt-resistor = <2360>; };
+			ina230@4b { compatible = "ti,ina230"; reg = <0x4b>; shunt-resistor = <5500>; };
+			ina230@4c { compatible = "ti,ina230"; reg = <0x4c>; shunt-resistor = <2360>; };
+			ina230@4d { compatible = "ti,ina230"; reg = <0x4d>; shunt-resistor = <770>; };
+			ina230@4e { compatible = "ti,ina230"; reg = <0x4e>; shunt-resistor = <770>; };
+			ina230@4f { compatible = "ti,ina230"; reg = <0x4f>; shunt-resistor = <770>; };
+		};
+
+		i2c@6 {
+			/* Backplane */
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <6>;
+			i2c-mux-idle-disconnect;
+		};
+
+		i2c@7 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <7>;
+			i2c-mux-idle-disconnect;
+
+			u41: pca9575@20 {
+				compatible = "nxp,pca9575";
+				reg = <0x20>;
+				gpio-controller;
+				#gpio-cells = <2>;
+
+				gpio-line-names =
+					"FMCA_EN_12V0", "FMCA_EN_3V3", "FMCA_EN_VADJ", "FMCA_PG_M2C",
+					"FMCA_PG_C2M", "FMCA_PRSNT_M2C_L", "FMCA_CLK_DIR", "SFP_LOS",
+					"FMCB_EN_12V0", "FMCB_EN_3V3", "FMCB_EN_VADJ", "FMCB_PG_M2C",
+					"FMCB_PG_C2M", "FMCB_PRSNT_M2C_L", "FMCB_CLK_DIR", "SFP_ModPrsL";
+				reset_gpios = <&gpio2 11 GPIO_ACTIVE_LOW>;
+			};
+
+			u42: pca9575@21 {
+				compatible = "nxp,pca9575";
+				reg = <0x21>;
+				gpio-controller;
+				#gpio-cells = <2>;
+				gpio-line-names =
+					"QSFPA_ModPrsL", "QSFPA_IntL", "QSFPA_ResetL", "QSFPA_ModSelL",
+					"QSFPA_LPMode", "QSFPB_ModPrsL", "QSFPB_IntL", "QSFPB_ResetL",
+					"SFP_TxFault", "SFP_TxDisable", "SFP_RS0", "SFP_RS1",
+					"QSFPB_ModSelL", "QSFPB_LPMode", "SEL_SFP", "ARM_MR";
+				reset_gpios = <&gpio2 11 GPIO_ACTIVE_LOW>;
+			};
+
+			u48: pca9575@22 {
+				compatible = "nxp,pca9575";
+				reg=<0x22>;
+				gpio-controller;
+				#gpio-cells = <2>;
+
+				sw-gpios = <&u48 0 0>, <&u48 1 0>, <&u48 2 0>, <&u48 3 0>,
+					<&u48 4 0>, <&u48 5 0>, <&u48 6 0>, <&u48 7 0>;
+				led-gpios = <&u48 7 0>, <&u48 6 0>, <&u48 5 0>, <&u48 4 0>,
+					<&u48 3 0>, <&u48 2 0>, <&u48 1 0>, <&u48 0 0>;
+
+				gpio-line-names =
+					"GP_SW1", "GP_SW2", "GP_SW3", "GP_SW4",
+					"GP_SW5", "GP_SW6", "GP_SW7", "GP_SW8",
+					"GP_LED8", "GP_LED7", "GP_LED6", "GP_LED5",
+					"GP_LED4", "GP_LED3", "GP_LED2", "GP_LED1";
+				reset_gpios = <&gpio2 11 GPIO_ACTIVE_LOW>;
+			};
+
+			u59: pca9575@23 {
+				compatible = "nxp,pca9575";
+				reg=<0x23>;
+				gpio-controller;
+				#gpio-cells = <2>;
+				gpio-line-names =
+					"GP_LED9", "GP_LED10", "GP_LED11", "GP_LED12",
+					"GTX1V8PowerFault", "PHYAPowerFault", "PHYBPowerFault", "ArmPowerFault",
+					"BP_SLOW_GPIO0", "BP_SLOW_GPIO1", "BP_SLOW_GPIO2", "BP_SLOW_GPIO3",
+					"BP_SLOW_GPIO4", "BP_SLOW_GPIO5", "__unused_u59_p16", "__unused_u59_p17";
+				reset_gpios = <&gpio2 11 GPIO_ACTIVE_LOW>;
+			};
+
+			tmp100@48 { compatible = "ti,tmp100"; reg = <0x48>; };
+			tmp100@4a { compatible = "ti,tmp100"; reg = <0x4a>; };
+			tmp100@4b { compatible = "ti,tmp100"; reg = <0x4b>; };
+			tmp100@4c { compatible = "ti,tmp100"; reg = <0x4c>; };
+
+			/* EEPROM bank and serial number are treated as separate devices */
+			at24c01@57 { compatible = "atmel,24c01"; reg = <0x57>; };
+			at24cs01@5f { compatible = "atmel,24cs01"; reg = <0x5f>; };
+		};
+	};
+};
+
+&i2c2 {
+	pca9548@71 {
+		compatible = "nxp,pca9548";
+		reg = <0x71>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		i2c@6 {
+			/* Backplane */
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <6>;
+			multi-master;
+
+			/* All backplanes should have this -- it's how we know they're there. */
+			at24c08@54 { compatible="atmel,24c08"; reg=<0x54>; };
+			at24cs08@5c { compatible="atmel,24cs08"; reg=<0x5c>; };
+
+			/* 16 slot backplane */
+			tmp421@4d { compatible="ti,tmp421"; reg=<0x4d>; };
+			tmp421@4e { compatible="ti,tmp421"; reg=<0x4e>; };
+			ina230@40 { compatible = "ti,ina230"; reg = <0x40>; shunt-resistor = <2360>; };
+			amc6821@18 { compatible = "ti,amc6821"; reg = <0x18>; };
+
+			/* Single slot backplane */
+		};
+	};
+};
+
+&pincntl {
+	mmc2_pins: pinmux_mmc2_pins {
+		pinctrl-single,pins = <
+			DM814X_IOPAD(0x0800, PIN_INPUT | 0x1)	/* SD1_CLK */
+			DM814X_IOPAD(0x0804, PIN_INPUT_PULLUP | 0x1)	/* SD1_CMD */
+			DM814X_IOPAD(0x0808, PIN_INPUT_PULLUP | 0x1)	/* SD1_DAT[0] */
+			DM814X_IOPAD(0x080c, PIN_INPUT_PULLUP | 0x1)	/* SD1_DAT[1] */
+			DM814X_IOPAD(0x0810, PIN_INPUT_PULLUP | 0x1)	/* SD1_DAT[2] */
+			DM814X_IOPAD(0x0814, PIN_INPUT_PULLUP | 0x1)	/* SD1_DAT[3] */
+			DM814X_IOPAD(0x0924, PIN_INPUT_PULLUP | 0x40)	/* SD1_POW */
+			DM814X_IOPAD(0x0928, PIN_INPUT | 0x40)	/* SD1_SDWP */
+			DM814X_IOPAD(0x093C, PIN_INPUT | 0x2)	/* SD1_SDCD */
+			>;
+	};
+
+	usb0_pins: pinmux_usb0_pins {
+		pinctrl-single,pins = <
+			DM814X_IOPAD(0x0c34, PIN_OUTPUT | 0x1)	/* USB0_DRVVBUS */
+			>;
+	};
+
+	usb1_pins: pinmux_usb1_pins {
+		pinctrl-single,pins = <
+			DM814X_IOPAD(0x0834, PIN_OUTPUT | 0x80)	/* USB1_DRVVBUS */
+			>;
+	};
+
+	gpio1_pins: pinmux_gpio1_pins {
+		pinctrl-single,pins = <
+			DM814X_IOPAD(0x081c, PIN_OUTPUT | 0x80)	/* PROGRAM_B */
+			DM814X_IOPAD(0x0820, PIN_INPUT | 0x80)	/* INIT_B */
+			DM814X_IOPAD(0x0824, PIN_INPUT | 0x80)	/* DONE */
+
+			DM814X_IOPAD(0x0838, PIN_INPUT_PULLUP | 0x80) /* FMCA_TMS */
+			DM814X_IOPAD(0x083c, PIN_INPUT_PULLUP | 0x80) /* FMCA_TCK */
+			DM814X_IOPAD(0x0898, PIN_INPUT_PULLUP | 0x80) /* FMCA_TDO */
+			DM814X_IOPAD(0x089c, PIN_INPUT_PULLUP | 0x80) /* FMCA_TDI */
+			DM814X_IOPAD(0x08ac, PIN_INPUT_PULLUP | 0x80) /* FMCA_TRST */
+
+			DM814X_IOPAD(0x08b0, PIN_INPUT_PULLUP | 0x80) /* FMCB_TMS */
+			DM814X_IOPAD(0x0a88, PIN_INPUT_PULLUP | 0x80) /* FMCB_TCK */
+			DM814X_IOPAD(0x0a8c, PIN_INPUT_PULLUP | 0x80) /* FMCB_TDO */
+			DM814X_IOPAD(0x08bc, PIN_INPUT_PULLUP | 0x80) /* FMCB_TDI */
+			DM814X_IOPAD(0x0a94, PIN_INPUT_PULLUP | 0x80) /* FMCB_TRST */
+
+			DM814X_IOPAD(0x08d4, PIN_INPUT_PULLUP | 0x80) /* FPGA_TMS */
+			DM814X_IOPAD(0x0aa8, PIN_INPUT_PULLUP | 0x80) /* FPGA_TCK */
+			DM814X_IOPAD(0x0adc, PIN_INPUT_PULLUP | 0x80) /* FPGA_TDO */
+			DM814X_IOPAD(0x0ab0, PIN_INPUT_PULLUP | 0x80) /* FPGA_TDI */
+			>;
+	};
+
+	gpio2_pins: pinmux_gpio2_pins {
+		pinctrl-single,pins = <
+			DM814X_IOPAD(0x090c, PIN_INPUT_PULLUP | 0x80) /* PHY A IRQ */
+			DM814X_IOPAD(0x0910, PIN_INPUT_PULLUP | 0x80) /* PHY A RESET */
+			DM814X_IOPAD(0x08f4, PIN_INPUT_PULLUP | 0x80) /* PHY B IRQ */
+			DM814X_IOPAD(0x08f8, PIN_INPUT_PULLUP | 0x80) /* PHY B RESET */
+
+			//DM814X_IOPAD(0x0a14, PIN_INPUT_PULLUP | 0x80) /* ARM IRQ */
+			//DM814X_IOPAD(0x0900, PIN_INPUT | 0x80) /* GPIO IRQ */
+			DM814X_IOPAD(0x0a2c, PIN_INPUT_PULLUP | 0x80) /* GPIO RESET */
+		>;
+	};
+
+	gpio4_pins: pinmux_gpio4_pins {
+		pinctrl-single,pins = <
+			/* The PLL doesn't react well to the SPI controller reset, so
+			 * we force the CS lines to pull up as GPIOs until we're ready.
+			 * See https://e2e.ti.com/support/processors/f/791/t/276011?Linux-support-for-AM3874-DM8148-in-Arago-linux-omap3
+			 */
+			DM814X_IOPAD(0x0b3c, PIN_INPUT_PULLUP | 0x80) /* BP_ARM_GPIO0 */
+			DM814X_IOPAD(0x0b40, PIN_INPUT_PULLUP | 0x80) /* BP_ARM_GPIO1 */
+			DM814X_IOPAD(0x0b44, PIN_INPUT_PULLUP | 0x80) /* BP_ARM_GPIO2 */
+			DM814X_IOPAD(0x0b48, PIN_INPUT_PULLUP | 0x80) /* BP_ARM_GPIO3 */
+			DM814X_IOPAD(0x0b4c, PIN_INPUT_PULLUP | 0x80) /* BP_ARM_GPIO4 */
+			DM814X_IOPAD(0x0b50, PIN_INPUT_PULLUP | 0x80) /* BP_ARM_GPIO5 */
+		>;
+	};
+
+	spi2_pins: pinmux_spi2_pins {
+		pinctrl-single,pins = <
+			DM814X_IOPAD(0x0950, PIN_INPUT_PULLUP | 0x80) /* PLL SPI CS1 as GPIO */
+			DM814X_IOPAD(0x0818, PIN_INPUT_PULLUP | 0x80) /* PLL SPI CS2 as GPIO */
+		>;
+	};
+
+	spi4_pins: pinmux_spi4_pins {
+		pinctrl-single,pins = <
+			DM814X_IOPAD(0x0a7c, 0x20)
+			DM814X_IOPAD(0x0b74, 0x20)
+			DM814X_IOPAD(0x0b78, PIN_OUTPUT | 0x20)
+			DM814X_IOPAD(0x0b7c, PIN_OUTPUT_PULLDOWN | 0x20)
+			DM814X_IOPAD(0x0b80, PIN_INPUT | 0x20)
+		>;
+	};
+};
+
+&gpio1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&gpio1_pins>;
+	gpio-line-names =
+		"", "PROGRAM_B", "INIT_B", "DONE",			/* 0-3 */
+		"", "", "", "",						/* 4-7 */
+		"FMCA_TMS", "FMCA_TCK", "FMCA_TDO", "FMCA_TDI",		/* 8-11 */
+		"", "", "", "FMCA_TRST",				/* 12-15 */
+		"FMCB_TMS", "FMCB_TCK", "FMCB_TDO", "FMCB_TDI",		/* 16-19 */
+		"FMCB_TRST", "", "", "",				/* 20-23 */
+		"FPGA_TMS", "FPGA_TCK", "FPGA_TDO", "FPGA_TDI",		/* 24-27 */
+		"", "", "", "";						/* 28-31 */
+};
+
+&gpio2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&gpio2_pins>;
+	gpio-line-names =
+		"PHYA_IRQ_N", "PHYA_RESET_N", "", "",			/* 0-3 */
+		"", "", "", "PHYB_IRQ_N",				/* 4-7 */
+		"PHYB_RESET_N", "ARM_IRQ", "GPIO_IRQ", "";		/* 8-11 */
+};
+
+&gpio3 {
+	pinctrl-names = "default";
+	/*pinctrl-0 = <&gpio3_pins>;*/
+	gpio-line-names =
+		"", "", "ARMClkSel0", "",				/* 0-3 */
+		"EnFPGARef", "", "", "ARMClkSel1";			/* 4-7 */
+};
+
+&gpio4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&gpio4_pins>;
+	gpio-line-names =
+		"BP_ARM_GPIO0", "BP_ARM_GPIO1", "BP_ARM_GPIO2", "BP_ARM_GPIO3",
+		"BP_ARM_GPIO4", "BP_ARM_GPIO5";
+};
+
+&usb0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&usb0_pins>;
+	dr_mode = "host";
+};
+
+&usb1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&usb1_pins>;
+	dr_mode = "host";
+};
+
+&mcspi1 {
+	s25fl256@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <40000000>;
+
+		fsbl@0 {
+			/* 256 kB */
+			label = "U-Boot-min";
+			reg = <0 0x40000>;
+		};
+		ssbl@1 {
+			/* 512 kB */
+			label = "U-Boot";
+			reg = <0x40000 0x80000>;
+		};
+		bootenv@2 {
+			/* 256 kB */
+			label = "U-Boot Env";
+			reg = <0xc0000 0x40000>;
+		};
+		kernel@3 {
+			/* 4 MB */
+			label = "Kernel";
+			reg = <0x100000 0x400000>;
+		};
+		ipmi@4 {
+			label = "IPMI FRU";
+			reg = <0x500000 0x40000>;
+		};
+		fs@5 {
+			label = "File System";
+			reg = <0x540000 0x1ac0000>;
+		};
+	};
+};
+
+&mcspi3 {
+	/* DMA event numbers stolen from MCASP */
+	dmas = <&edma_xbar 8 0 16 &edma_xbar 9 0 17
+		&edma_xbar 10 0 18 &edma_xbar 11 0 19>;
+	dma-names = "tx0", "rx0", "tx1", "rx1";
+};
+
+&mcspi4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi4_pins>;
+
+	/* DMA event numbers stolen from MCASP, MCBSP */
+	dmas = <&edma_xbar 12 0 20 &edma_xbar 13 0 21>;
+	dma-names = "tx0", "rx0";
+};