Subject: [PATCH] omap: Add devicetree for Gumstix Pepper board

From: [email-masked] (Florian Vaussard)
Date: Tue, 10 Jun 2014 17:59:19 +0200

Hi Ash,

On 06/06/2014 10:51 PM, Ash Charles wrote:
> This adds the Gumstix Pepper[1] single-board computer based on the
> TI AM335x processor. Schematics are available [2].
> 
> [1] https://store.gumstix.com/index.php/products/344/
> [2] https://pubs.gumstix.com/boards/PEPPER/
> 
> Signed-off-by: Ash Charles <[email-masked]>
> ---
>  MAINTAINERS                         |   6 +
>  arch/arm/boot/dts/Makefile          |   3 +-
>  arch/arm/boot/dts/am335x-pepper.dts | 661 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 669 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm/boot/dts/am335x-pepper.dts
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 51ebb77..d44e2e3 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -6427,6 +6427,12 @@ L:	linux-omap at vger.kernel.org
>  S:	Maintained
>  F:	arch/arm/boot/dts/am335x-nano.dts
>  
> +OMAP/GUMSTIX PEPPER MACHINE SUPPORT
> +M:	Ash Charles <[email-masked]>
> +L:	linux-omap at vger.kernel.org
> +S:	Maintained
> +F:	arch/arm/boot/dts/am335x-pepper.dts
> +

It is not very common to add oneself as the maintainer of a single .dts
file. I could only found the am335x-nano.dts with such a way of doing.
Usually get_maintainer.pl will also take into account the commit author
and properly handle this case.

>  OMFS FILESYSTEM
>  M:	Bob Copeland <[email-masked]>
>  L:	linux-karma-devel at lists.sourceforge.net
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index a81a24c..9e0352f 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -277,7 +277,8 @@ dtb-$(CONFIG_SOC_AM33XX) += am335x-base0033.dtb \
>  	am335x-boneblack.dtb \
>  	am335x-evm.dtb \
>  	am335x-evmsk.dtb \
> -	am335x-nano.dtb
> +	am335x-nano.dtb \
> +	am335x-pepper.dtb
>  dtb-$(CONFIG_ARCH_OMAP4) += omap4-duovero-parlor.dtb \
>  	omap4-panda.dtb \
>  	omap4-panda-a4.dtb \
> diff --git a/arch/arm/boot/dts/am335x-pepper.dts b/arch/arm/boot/dts/am335x-pepper.dts
> new file mode 100644
> index 0000000..27d9b75
> --- /dev/null
> +++ b/arch/arm/boot/dts/am335x-pepper.dts
> @@ -0,0 +1,661 @@
> +/*
> + * Copyright (C) 2014 Gumstix, Inc. - https://www.gumstix.com/
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +/dts-v1/;
> +
> +#include "am33xx.dtsi"
> +
> +/ {
> +	model = "Gumstix Pepper";
> +	compatible = "gumstix,am335x-pepper", "ti,am33xx";
> +
> +	cpus {
> +		cpu at 0 {
> +			cpu0-supply = <&dcdc3_reg>;
> +		};
> +	};
> +
> +	memory {
> +		device_type = "memory";
> +		reg = <0x80000000 0x20000000>; /* 512 MB */
> +	};
> +
> +	buttons: user_buttons {
> +		compatible = "gpio-keys";
> +	};
> +

For all the boards that I have seen, all the properties of a new node
are declared at the same place, where you put some of them at the end. I
have not a strong opinion on this, but I find it a bit more difficult to
read.

> +	leds: user_leds {
> +		compatible = "gpio-leds";
> +	};
> +
> +	panel: lcd_panel {
> +		compatible = "ti,tilcdc,panel";
> +	};
> +
> +	sound: sound_iface {
> +		compatible = "ti,da830-evm-audio";
> +	};
> +
> +	vbat: fixedregulator at 0 {
> +		compatible = "regulator-fixed";
> +	};
> +
> +	v3v3c_reg: fixedregulator at 1 {
> +		compatible = "regulator-fixed";
> +	};
> +
> +	vdd5_reg: fixedregulator at 2 {
> +		compatible = "regulator-fixed";
> +	};
> +};
> +
> +/* I2C Busses */
> +&i2c0 {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&i2c0_pins>;
> +
> +	clock-frequency = <400000>;
> +
> +	tps: tps at 24 {
> +		reg = <0x24>;
> +	};
> +
> +	eeprom: eeprom at 50 {
> +		compatible = "at,24c256";
> +		reg = <0x50>;
> +	};
> +
> +	audio_codec: tlv320aic3106 at 1b {
> +		compatible = "ti,tlv320aic3106";
> +		reg = <0x1b>;
> +	};
> +
> +	accel: lis331dlh at 1d {
> +		compatible = "st,lis3lv02d";
> +		reg = <0x1d>;
> +	};
> +};
> +
> +&i2c1 {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&i2c1_pins>;
> +	clock-frequency = <400000>;
> +};
> +
> +&am33xx_pinmux {
> +	i2c0_pins: pinmux_i2c0 {
> +		pinctrl-single,pins = <
> +			0x188 (PIN_INPUT_PULLUP | MUX_MODE0)	/* i2c0_sda.i2c0_sda */
> +			0x18c (PIN_INPUT_PULLUP | MUX_MODE0)	/* i2c0_scl.i2c0_scl */
> +		>;
> +	};
> +	i2c1_pins: pinmux_i2c1 {
> +		pinctrl-single,pins = <
> +			0x10C (PIN_INPUT_PULLUP | MUX_MODE3)	/* mii1_crs,i2c1_sda */
> +			0x110 (PIN_INPUT_PULLUP | MUX_MODE3)	/* mii1_rxerr,i2c1_scl */
> +		>;
> +	};
> +};
> +

Splitting the pinmux is also unusual, but in this case I found it more
readable.

> +/* Accelerometer */
> +&accel {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&accel_pins>;
> +
> +	Vdd-supply = <&ldo3_reg>;
> +	Vdd_IO-supply = <&ldo3_reg>;
> +	st,irq1-click;
> +	st,wakeup-x-lo;
> +	st,wakeup-x-hi;
> +	st,wakeup-y-lo;
> +	st,wakeup-y-hi;
> +	st,wakeup-z-lo;
> +	st,wakeup-z-hi;
> +	st,min-limit-x = <92>;
> +	st,max-limit-x = <14>;
> +	st,min-limit-y = <14>;
> +	st,max-limit-y = <92>;
> +	st,min-limit-z = <92>;
> +	st,max-limit-z = <14>;
> +};
> +
> +&am33xx_pinmux {
> +	accel_pins: pinmux_accel {
> +		pinctrl-single,pins = <
> +			0x98 (PIN_INPUT_PULLUP | MUX_MODE7)   /* gpmc_wen.gpio2_4 */

The INT pin of the LIS33 chip seems to be push-pull, thus enabling the
pullup on the SoC side will increase the current consumption when held down.

> +		>;
> +	};
> +};
> +
> +/* Audio */
> +&audio_codec {
> +	status = "okay";
> +
> +	gpio-reset = <&gpio1 16 GPIO_ACTIVE_LOW>;
> +	AVDD-supply = <&ldo3_reg>;
> +	IOVDD-supply = <&ldo3_reg>;
> +	DRVDD-supply = <&ldo3_reg>;
> +	DVDD-supply = <&dcdc1_reg>;
> +};
> +
> +&sound {
> +	ti,model = "AM335x-EVM";
> +	ti,audio-codec = <&audio_codec>;
> +	ti,mcasp-controller = <&mcasp0>;
> +	ti,codec-clock-rate = <12000000>;
> +	ti,audio-routing =
> +		"Headphone Jack",	"HPLOUT",
> +		"Headphone Jack",	"HPROUT",
> +		"LINE1L",		"Line In";
> +};
> +
> +&mcasp0 {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&audio_pins>;
> +
> +	op-mode = <0>;	/* MCASP_ISS_MODE */
> +	tdm-slots = <2>;
> +	serial-dir = <
> +		1 2 0 0
> +		0 0 0 0
> +		0 0 0 0
> +		0 0 0 0
> +	>;
> +	tx-num-evt = <1>;
> +	rx-num-evt = <1>;
> +};
> +
> +&am33xx_pinmux {
> +	audio_pins: pinmux_audio {
> +		pinctrl-single,pins = <
> +			0x1AC (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_ahcklx.mcasp0_ahclkx */
> +			0x194 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_fsx.mcasp0_fsx */
> +			0x190 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_aclkx.mcasp0_aclkx */
> +			0x198 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_axr0.mcasp0_axr0 */
> +			0x1A8 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_axr1.mcasp0_axr1 */
> +			0x40 (PIN_OUTPUT_PULLUP | MUX_MODE7)	/* gpmc_a0.gpio1_16 */

You already have an external pullup in your design, so this one seems
superfluous.

> +		>;
> +	};
> +};
> +
> +/* Display: 24-bit LCD Screen */
> +&panel {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&lcd_pins>;
> +	panel-info {
> +		ac-bias = <255>;
> +		ac-bias-intrpt = <0>;
> +		dma-burst-sz = <16>;
> +		bpp = <32>;
> +		fdd = <0x80>;
> +		sync-edge = <0>;
> +		sync-ctrl = <1>;
> +		raster-order = <0>;
> +		fifo-th = <0>;
> +	};
> +	display-timings {
> +		native-mode = <&timing0>;
> +		timing0: 480x272 {
> +			clock-frequency = <18400000>;
> +			hactive = <480>;
> +			vactive = <272>;
> +			hfront-porch = <8>;
> +			hback-porch = <4>;
> +			hsync-len = <41>;
> +			vfront-porch = <4>;
> +			vback-porch = <2>;
> +			vsync-len = <10>;
> +			hsync-active = <1>;
> +			vsync-active = <1>;
> +		};
> +	};
> +};
> +
> +&lcdc {
> +	status = "okay";
> +};
> +
> +&am33xx_pinmux {
> +	lcd_pins: pinmux_lcd {
> +		pinctrl-single,pins = <
> +			0xa0 (PIN_OUTPUT | MUX_MODE0)	/* lcd_data0.lcd_data0 */
> +			0xa4 (PIN_OUTPUT | MUX_MODE0)	/* lcd_data1.lcd_data1 */
> +			0xa8 (PIN_OUTPUT | MUX_MODE0)	/* lcd_data2.lcd_data2 */
> +			0xac (PIN_OUTPUT | MUX_MODE0)	/* lcd_data3.lcd_data3 */
> +			0xb0 (PIN_OUTPUT | MUX_MODE0)	/* lcd_data4.lcd_data4 */
> +			0xb4 (PIN_OUTPUT | MUX_MODE0)	/* lcd_data5.lcd_data5 */
> +			0xb8 (PIN_OUTPUT | MUX_MODE0)	/* lcd_data6.lcd_data6 */
> +			0xbc (PIN_OUTPUT | MUX_MODE0)	/* lcd_data7.lcd_data7 */
> +			0xc0 (PIN_OUTPUT | MUX_MODE0)	/* lcd_data8.lcd_data8 */
> +			0xc4 (PIN_OUTPUT | MUX_MODE0)	/* lcd_data9.lcd_data9 */
> +			0xc8 (PIN_OUTPUT | MUX_MODE0)	/* lcd_data10.lcd_data10 */
> +			0xcc (PIN_OUTPUT | MUX_MODE0)	/* lcd_data11.lcd_data11 */
> +			0xd0 (PIN_OUTPUT | MUX_MODE0)	/* lcd_data12.lcd_data12 */
> +			0xd4 (PIN_OUTPUT | MUX_MODE0)	/* lcd_data13.lcd_data13 */
> +			0xd8 (PIN_OUTPUT | MUX_MODE0)	/* lcd_data14.lcd_data14 */
> +			0xdc (PIN_OUTPUT | MUX_MODE0)	/* lcd_data15.lcd_data15 */
> +			0x20 (PIN_OUTPUT | MUX_MODE1)	/* gpmc_ad8.lcd_data16 */
> +			0x24 (PIN_OUTPUT | MUX_MODE1)	/* gpmc_ad9.lcd_data17 */
> +			0x28 (PIN_OUTPUT | MUX_MODE1)	/* gpmc_ad10.lcd_data18 */
> +			0x2c (PIN_OUTPUT | MUX_MODE1)	/* gpmc_ad11.lcd_data19 */
> +			0x30 (PIN_OUTPUT | MUX_MODE1)	/* gpmc_ad12.lcd_data20 */
> +			0x34 (PIN_OUTPUT | MUX_MODE1)	/* gpmc_ad13.lcd_data21 */
> +			0x38 (PIN_OUTPUT | MUX_MODE1)	/* gpmc_ad14.lcd_data22 */
> +			0x3c (PIN_OUTPUT | MUX_MODE1)	/* gpmc_ad15.lcd_data23 */
> +			0xe0 (PIN_OUTPUT | MUX_MODE0)	/* lcd_vsync.lcd_vsync */
> +			0xe4 (PIN_OUTPUT | MUX_MODE0)	/* lcd_hsync.lcd_hsync */
> +			0xe8 (PIN_OUTPUT | MUX_MODE0)	/* lcd_pclk.lcd_pclk */
> +			0xec (PIN_OUTPUT | MUX_MODE0)	/* lcd_ac_bias_en.lcd_ac_bias_en */
> +			/* Display Enable */
> +			0x6c (PIN_OUTPUT_PULLUP | MUX_MODE7)	/* gpmc_a11.gpio1_27 */
> +		>;
> +	};
> +};
> +
> +/* Ethernet */
> +&cpsw_emac0 {
> +	status = "okay";
> +	phy_id = <&davinci_mdio>, <0>;
> +	phy-mode = "rgmii";
> +};
> +
> +&cpsw_emac1 {
> +	status = "okay";
> +	phy_id = <&davinci_mdio>, <1>;
> +	phy-mode = "rgmii";
> +};
> +
> +&davinci_mdio {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&mdio_pins>;
> +};
> +
> +&mac {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&ethernet_pins>;
> +};
> +
> +
> +&am33xx_pinmux {
> +	ethernet_pins: pinmux_ethernet {
> +		pinctrl-single,pins = <
> +			0x114 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)	/* mii1_txen.rgmii1_tctl */
> +			0x118 (PIN_INPUT_PULLUP | MUX_MODE2)	/* mii1_rxdv.rgmii1_rctl */
> +			0x11c (PIN_OUTPUT_PULLDOWN | MUX_MODE2)	/* mii1_txd3.rgmii1_td3 */
> +			0x120 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)	/* mii1_txd2.rgmii1_td2 */
> +			0x124 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)	/* mii1_txd1.rgmii1_td1 */
> +			0x128 (PIN_OUTPUT_PULLDOWN | MUX_MODE2)	/* mii1_txd0.rgmii1_td0 */
> +			0x12c (PIN_INPUT_PULLUP | MUX_MODE2)	/* mii1_txclk.rgmii1_tclk */
> +			0x130 (PIN_INPUT_PULLUP | MUX_MODE2)	/* mii1_rxclk.rgmii1_rclk */
> +			0x134 (PIN_INPUT_PULLUP | MUX_MODE2)	/* mii1_rxd3.rgmii1_rxd3 */
> +			0x138 (PIN_INPUT_PULLUP | MUX_MODE2)	/* mii1_rxd2.rgmii1_rxd2 */
> +			0x13c (PIN_INPUT_PULLUP | MUX_MODE2)	/* mii1_rxd1.rgmii1_rxd1 */
> +			0x140 (PIN_INPUT_PULLUP | MUX_MODE2)	/* mii1_rxd0.rgmii1_rxd0 */
> +			/* ethernet interrupt */
> +			0x144 (PIN_INPUT_PULLUP | MUX_MODE7)	/* rmii2_refclk.gpio0_29 */
> +			/* ethernet PHY nReset */
> +			0x108 (PIN_OUTPUT_PULLUP | MUX_MODE7)	/* mii1_col.gpio3_0 */
> +		>;
> +	};
> +
> +	mdio_pins: pinmux_mdio {
> +		pinctrl-single,pins = <
> +			0x148 (PIN_INPUT_PULLUP | SLEWCTRL_FAST | MUX_MODE0)	/* mdio_data.mdio_data */
> +			0x14c (PIN_OUTPUT_PULLUP | MUX_MODE0)			/* mdio_clk.mdio_clk */
> +		>;
> +	};
> +};
> +
> +/* MMC */
> +&mmc1 {
> +	/* Bootable SD card slot */
> +	status = "okay";
> +	vmmc-supply = <&ldo3_reg>;
> +	bus-width = <4>;
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&sd_pins>;
> +	cd-gpios = <&gpio0 6 GPIO_ACTIVE_LOW>;
> +};
> +
> +&mmc2 {
> +	/* eMMC (not populated) on MMC #2 */
> +	status = "disabled";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&emmc_pins>;
> +	vmmc-supply = <&ldo3_reg>;
> +	bus-width = <8>;
> +	ti,non-removable;
> +};
> +
> +&edma {
> +	/* Map eDMA MMC2 Events from Crossbar */
> +	ti,edma-xbar-event-map = /bits/ 16 <1 12
> +                                            2 13>;
> +};
> +
> +
> +&mmc3 {
> +	/* Wifi & Bluetooth on MMC #3 */
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&wireless_pins>;
> +	vmmmc-supply = <&v3v3c_reg>;
> +	bus-width = <4>;
> +	ti,non-removable;
> +	dmas = <&edma 12
> +		&edma 13>;
> +	dma-names = "tx", "rx";
> +};
> +
> +
> +&am33xx_pinmux {
> +	sd_pins: pinmux_sd_card {
> +		pinctrl-single,pins = <
> +			0xf0 (PIN_INPUT_PULLUP | MUX_MODE0)	/* mmc0_dat0.mmc0_dat0 */
> +			0xf4 (PIN_INPUT_PULLUP | MUX_MODE0)	/* mmc0_dat1.mmc0_dat1 */
> +			0xf8 (PIN_INPUT_PULLUP | MUX_MODE0)	/* mmc0_dat2.mmc0_dat2 */
> +			0xfc (PIN_INPUT_PULLUP | MUX_MODE0)	/* mmc0_dat3.mmc0_dat3 */
> +			0x100 (PIN_INPUT_PULLUP | MUX_MODE0)	/* mmc0_clk.mmc0_clk */
> +			0x104 (PIN_INPUT_PULLUP | MUX_MODE0)	/* mmc0_cmd.mmc0_cmd */
> +			0x160 (PIN_INPUT | MUX_MODE7)		/* spi0_cs1.gpio0_6 */
> +		>;
> +	};
> +	emmc_pins: pinmux_emmc {
> +		pinctrl-single,pins = <
> +			0x80 (PIN_INPUT_PULLUP | MUX_MODE2)	/* gpmc_csn1.mmc1_clk */
> +			0x84 (PIN_INPUT_PULLUP | MUX_MODE2)	/* gpmc_csn2.mmc1_cmd */
> +			0x00 (PIN_INPUT_PULLUP | MUX_MODE1)	/* gpmc_ad0.mmc1_dat0 */
> +			0x04 (PIN_INPUT_PULLUP | MUX_MODE1)	/* gpmc_ad1.mmc1_dat1 */
> +			0x08 (PIN_INPUT_PULLUP | MUX_MODE1)	/* gpmc_ad2.mmc1_dat2 */
> +			0x0c (PIN_INPUT_PULLUP | MUX_MODE1)	/* gpmc_ad3.mmc1_dat3 */
> +			0x10 (PIN_INPUT_PULLUP | MUX_MODE1)	/* gpmc_ad4.mmc1_dat4 */
> +			0x14 (PIN_INPUT_PULLUP | MUX_MODE1)	/* gpmc_ad5.mmc1_dat5 */
> +			0x18 (PIN_INPUT_PULLUP | MUX_MODE1)	/* gpmc_ad6.mmc1_dat6 */
> +			0x1c (PIN_INPUT_PULLUP | MUX_MODE1)	/* gpmc_ad7.mmc1_dat7 */
> +			/* EMMC nReset */
> +			0x74 (PIN_OUTPUT_PULLUP | MUX_MODE7)	/* gpmc_wpn.gpio0_31 */
> +		>;
> +	};
> +	wireless_pins: pinmux_wireless {
> +		pinctrl-single,pins = <
> +			0x44 (PIN_INPUT_PULLUP | MUX_MODE3)	/* gpmc_a1.mmc2_dat0 */
> +			0x48 (PIN_INPUT_PULLUP | MUX_MODE3)	/* gpmc_a2.mmc2_dat1 */
> +			0x4c (PIN_INPUT_PULLUP | MUX_MODE3)	/* gpmc_a3.mmc2_dat2 */
> +			0x78 (PIN_INPUT_PULLUP | MUX_MODE3)	/* gpmc_ben1.mmc2_dat3 */
> +			0x88 (PIN_INPUT_PULLUP | MUX_MODE3)	/* gpmc_csn3.mmc2_cmd */
> +			0x8c (PIN_INPUT_PULLUP | MUX_MODE3)	/* gpmc_clk.mmc1_clk */
> +			/* WLAN nReset */
> +			0x60 (PIN_OUTPUT_PULLUP | MUX_MODE7)	/* gpmc_a8.gpio1_24 */
> +			/* WLAN nPower down */
> +			0x70 (PIN_OUTPUT_PULLUP | MUX_MODE7)	/* gpmc_wait0.gpio0_30 */
> +			/* 32kHz Clock */
> +			0x1b4 (PIN_OUTPUT_PULLDOWN | MUX_MODE3)	/* xdma_event_intr1.clkout2 */
> +		>;
> +	};
> +};
> +
> +/* Power */
> +&vbat {
> +	regulator-name = "vbat";
> +	regulator-min-microvolt = <5000000>;
> +	regulator-max-microvolt = <5000000>;
> +	regulator-always-on;
> +};
> +
> +&v3v3c_reg {
> +	regulator-name = "v3v3c_reg";
> +	regulator-min-microvolt = <3300000>;
> +	regulator-max-microvolt = <3300000>;
> +	vin-supply = <&vbat>;
> +	regulator-always-on;
> +};
> +
> +&vdd5_reg {
> +	regulator-name = "vdd5_reg";
> +	regulator-min-microvolt = <5000000>;
> +	regulator-max-microvolt = <5000000>;
> +	regulator-always-on;
> +	vin-supply = <&vbat>;
> +};
> +
> +/include/ "tps65217.dtsi"
> +
> +&tps {
> +	backlight {
> +		isel = <1>; /* ISET1 */
> +		fdim = <200>; /* TPS65217_BL_FDIM_200HZ */
> +		default-brightness = <80>;
> +	};
> +
> +	regulators {
> +		dcdc1_reg: regulator at 0 {
> +			/* VDD_1V8 system supply */
> +			regulator-always-on;
> +		};
> +
> +		dcdc2_reg: regulator at 1 {
> +			/* VDD_CORE voltage limits 0.95V - 1.26V with +/-4% tolerance */
> +			regulator-name = "vdd_core";
> +			regulator-min-microvolt = <925000>;
> +			regulator-max-microvolt = <1325000>;
> +			regulator-boot-on;
> +			regulator-always-on;
> +		};
> +
> +		dcdc3_reg: regulator at 2 {
> +			/* VDD_MPU voltage limits 0.95V - 1.1V with +/-4% tolerance */
> +			regulator-name = "vdd_mpu";
> +			regulator-min-microvolt = <925000>;
> +			regulator-max-microvolt = <1150000>;
> +			regulator-boot-on;
> +			regulator-always-on;
> +		};
> +
> +		ldo1_reg: regulator at 3 {
> +			/* VRTC 1.8V always-on supply */
> +			regulator-always-on;
> +		};
> +
> +		ldo2_reg: regulator at 4 {
> +			/* 3.3V rail */
> +			regulator-always-on;
> +		};
> +
> +		ldo3_reg: regulator at 5 {
> +			/* VDD_3V3A 3.3V rail */
> +			regulator-always-on;
> +			regulator-min-microvolt = <3300000>;
> +			regulator-max-microvolt = <3300000>;
> +		};
> +
> +		ldo4_reg: regulator at 6 {
> +			/* VDD_3V3B 3.3V rail */
> +			regulator-always-on;
> +		};

Why are all the regulators always on? Most of them should be managed
automatically if you have correct dependencies, shouldn't they?

> +	};
> +};
> +
> +/* SPI Busses */
> +&spi0 {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&spi0_pins>;
> +};
> +
> +&am33xx_pinmux {
> +	spi0_pins: pinmux_spi0 {
> +		pinctrl-single,pins = <
> +			0x150 (PIN_INPUT_PULLUP | MUX_MODE0) /* spi0_sclk.spi0_sclk */
> +			0x15C (PIN_INPUT_PULLUP | MUX_MODE0) /* spi0_cs0.spi0_cs0 */
> +			0x154 (PIN_INPUT_PULLUP | MUX_MODE0) /* spi0_d0.spi0_d0 */
> +			0x158 (PIN_INPUT_PULLUP | MUX_MODE0) /* spi0_d1.spi0_d1 */
> +		>;
> +	};
> +};
> +
> +/* Touch Screen */
> +&tscadc {
> +	status = "okay";
> +	tsc {
> +		ti,wires = <4>;
> +		ti,x-plate-resistance = <200>;
> +		ti,coordinate-readouts = <5>;
> +		ti,wire-config = <0x00 0x11 0x22 0x33>;
> +	};
> +
> +	adc {
> +		ti,adc-channels = <4 5 6 7>;
> +	};
> +};
> +
> +/* UARTs */
> +&uart0 {
> +	/* Serial Console */
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&uart0_pins>;
> +};
> +
> +&uart1 {
> +	/* Broken out to J6 header */
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&uart1_pins>;
> +};
> +
> +&am33xx_pinmux {
> +	uart0_pins: pinmux_uart0 {
> +		pinctrl-single,pins = <
> +			0x170 (PIN_INPUT_PULLUP | MUX_MODE0)	/* uart0_rxd.uart0_rxd */
> +			0x174 (PIN_OUTPUT_PULLDOWN | MUX_MODE0)	/* uart0_txd.uart0_txd */
> +		>;
> +	};
> +	uart1_pins: pinmux_uart1 {
> +		pinctrl-single,pins = <
> +			0x178 (PIN_INPUT_PULLUP | MUX_MODE0)	/* uart1_ctsn.uart1_ctsn */
> +			0x17C (PIN_OUTPUT_PULLDOWN | MUX_MODE0)	/* uart1_rtsn.uart1_rtsn */
> +			0x180 (PIN_INPUT_PULLUP | MUX_MODE0)	/* uart1_rxd.uart1_rxd */
> +			0x184 (PIN_OUTPUT_PULLDOWN | MUX_MODE0)	/* uart1_txd.uart1_txd */
> +		>;
> +	};
> +};
> +
> +/* USB */
> +&usb {
> +	status = "okay";
> +
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&usb_pins>;
> +};
> +
> +&usb_ctrl_mod {
> +	status = "okay";
> +};
> +
> +&usb0_phy {
> +	status = "okay";
> +};
> +
> +&usb1_phy {
> +	status = "okay";
> +};
> +
> +&usb0 {
> +	status = "okay";
> +        dr_mode = "host";
> +};
> +
> +&usb1 {
> +	status = "okay";
> +        dr_mode = "host";
> +};
> +
> +&cppi41dma {
> +	status = "okay";
> +};
> +
> +&am33xx_pinmux {
> +	usb_pins: pinmux_usb {
> +		pinctrl-single,pins = <
> +			/* USB0 Over-Current (active low) */
> +			0x64 (PIN_INPUT | MUX_MODE7)	/* gpmc_a9.gpio1_25 */
> +			/* USB1 Over-Current (active low) */
> +			0x68 (PIN_INPUT | MUX_MODE7)	/* gpmc_a10.gpio1_26 */
> +		>;
> +	};
> +};
> +
> +/* User IO */
> +&leds {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&user_leds_pins>;
> +
> +	led at 0 {
> +		label = "pepper:user0:blue";
> +		gpios = <&gpio1 20 GPIO_ACTIVE_HIGH>;
> +		linux,default-trigger = "none";
> +		default-state = "off";
> +	};
> +
> +	led at 1 {
> +		label = "pepper:user1:red";
> +		gpios = <&gpio1 21 GPIO_ACTIVE_HIGH>;
> +		linux,default-trigger = "none";
> +		default-state = "off";
> +	};
> +};
> +
> +&buttons {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&user_buttons_pins>;
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	button at 0 {
> +		label = "home";
> +		linux,code = <102>;

You can use the key codes defined in <dt-bindings/input/input.h>.

> +		gpios = <&gpio1 22 GPIO_ACTIVE_LOW>;
> +		gpio-key,wakeup;
> +	};
> +
> +	button at 1 {
> +		label = "menu";
> +		linux,code = <139>;

KEY_MENU

> +		gpios = <&gpio1 23 GPIO_ACTIVE_LOW>;
> +		gpio-key,wakeup;
> +	};
> +
> +	buttons at 2 {
> +		label = "power";
> +		linux,code = <116>;

KEY_POWER

> +		gpios = <&gpio0 7 GPIO_ACTIVE_LOW>;
> +		gpio-key,wakeup;
> +	};
> +};
> +
> +&am33xx_pinmux {
> +	user_leds_pins: pinmux_user_leds {
> +		pinctrl-single,pins = <
> +			0x50 (PIN_OUTPUT_PULLDOWN | MUX_MODE7)	/* gpmc_a4.gpio1_20 */
> +			0x54 (PIN_OUTPUT_PULLDOWN | MUX_MODE7)	/* gpmc_a5.gpio1_21 */

Why enabling the pulldown on an output gpio? You will increase the power
consumption when driving high.

> +		>;
> +	};
> +
> +	user_buttons_pins: pinmux_user_buttons {
> +		pinctrl-single,pins = <
> +			0x58 (PIN_INPUT_PULLUP | MUX_MODE7)	/* gpmc_a6.gpio1_22 */
> +			0x5C (PIN_INPUT_PULLUP | MUX_MODE7)	/* gpmc_a7.gpio1_21 */
> +			0x164 (PIN_INPUT_PULLUP | MUX_MODE7)	/* gpmc_a8.gpio0_7 */
> +		>;
> +	};
> +};
> 

Regards,

Florian