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Date:   Wed, 3 Mar 2021 21:44:23 +0800
From:   Shawn Guo <shawnguo@kernel.org>
To:     Alistair Francis <alistair@alistair23.me>
Cc:     arnd@arndb.de, olof@lixom.net, robh+dt@kernel.org,
        s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com,
        linux-imx@nxp.com, linux-arm-kernel@lists.infradead.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        alistair23@gmail.com
Subject: Re: [PATCH v3 1/3] ARM: imx7d-remarkable2.dts: Initial device tree
 for reMarkable2
Message-ID: <20210303134422.GJ15865@dragon>
References: <20210204030316.489-1-alistair@alistair23.me>
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In-Reply-To: <20210204030316.489-1-alistair@alistair23.me>
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On Wed, Feb 03, 2021 at 07:03:14PM -0800, Alistair Francis wrote:
> The reMarkable2 (https://remarkable.com) is an e-ink tablet based on
> the imx7d SoC.
> 
> This commit is based on the DTS provide by reMarkable but ported to the
> latest kernel (instead of 4.14). I have removed references to
> non-upstream devices and have changed the UART so that the console can
> be accessed without having to open up the device via the OTG pogo pins.

Just out of curiosity, this is a DIY cable or something generally
available from vendor?

> 
> Currently the kernel boots, but there is no support for the dispaly,
> WiFi or the power controller chips.

There are still some WiFi related devices.  Can we drop all those
untested stuff?

> 
> Signed-off-by: Alistair Francis <alistair@alistair23.me>
> ---
>  arch/arm/boot/dts/Makefile              |   1 +
>  arch/arm/boot/dts/imx7d-remarkable2.dts | 253 ++++++++++++++++++++++++
>  2 files changed, 254 insertions(+)
>  create mode 100644 arch/arm/boot/dts/imx7d-remarkable2.dts
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 3d1ea0b25168..9608c363b25f 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -658,6 +658,7 @@ dtb-$(CONFIG_SOC_IMX7D) += \
>  	imx7d-pico-hobbit.dtb \
>  	imx7d-pico-nymph.dtb \
>  	imx7d-pico-pi.dtb \
> +	imx7d-remarkable2.dtb \
>  	imx7d-sbc-imx7.dtb \
>  	imx7d-sdb.dtb \
>  	imx7d-sdb-reva.dtb \
> diff --git a/arch/arm/boot/dts/imx7d-remarkable2.dts b/arch/arm/boot/dts/imx7d-remarkable2.dts
> new file mode 100644
> index 000000000000..0aae13f5eed6
> --- /dev/null
> +++ b/arch/arm/boot/dts/imx7d-remarkable2.dts
> @@ -0,0 +1,253 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (C) 2015 Freescale Semiconductor, Inc.
> + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/
> + *
> + */
> +
> +/dts-v1/;
> +
> +#include "imx7d.dtsi"
> +
> +/ {
> +	model = "reMarkable 2.0";
> +	compatible = "fsl,imx7d-remarkable2", "fsl,imx7d";

The new compatible needs to be documented.  Also the compatible doesn't
look right, as this is a device from reMarkable rather than FSL.

Shawn

> +
> +	chosen {
> +		stdout-path = &uart6;
> +	};
> +
> +	memory {
> +		reg = <0x80000000 0x40000000>;
> +	};
> +
> +	reg_brcm: regulator-brcm {
> +		compatible = "regulator-fixed";
> +		regulator-name = "brcm_reg";
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_brcm_reg>;
> +		gpio = <&gpio6 13 GPIO_ACTIVE_HIGH>;
> +		enable-active-high;
> +		startup-delay-us = <150>;
> +	};
> +
> +	wifi_pwrseq: wifi_pwrseq {
> +		compatible = "mmc-pwrseq-simple";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_wifi>;
> +		reset-gpios = <&gpio5 9 GPIO_ACTIVE_LOW>;
> +		clocks = <&clks IMX7D_CLKO2_ROOT_DIV>;
> +		clock-names = "ext_clock";
> +	};
> +};
> +
> +&clks {
> +	assigned-clocks = <&clks IMX7D_CLKO2_ROOT_SRC>,
> +			  <&clks IMX7D_CLKO2_ROOT_DIV>;
> +	assigned-clock-parents = <&clks IMX7D_CKIL>;
> +	assigned-clock-rates = <0>, <32768>;
> +};
> +
> +&crypto {
> +	status = "disabled";
> +};
> +
> +&dma_apbh {
> +	status = "disabled";
> +};
> +
> +&sdma {
> +	status = "okay";
> +};
> +
> +&uart1 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_uart1>;
> +	assigned-clocks = <&clks IMX7D_UART1_ROOT_SRC>;
> +	assigned-clock-parents = <&clks IMX7D_OSC_24M_CLK>;
> +	status = "okay";
> +};
> +
> +&uart6 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_uart6>;
> +	assigned-clocks = <&clks IMX7D_UART6_ROOT_SRC>;
> +	assigned-clock-parents = <&clks IMX7D_OSC_24M_CLK>;
> +	status = "okay";
> +};
> +
> +&usbotg2 {
> +	srp-disable;
> +	hnp-disable;
> +	status = "okay";
> +};
> +
> +&usdhc2 {
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	pinctrl-names = "default", "state_100mhz", "sleep";
> +	pinctrl-0 = <&pinctrl_usdhc2>;
> +	pinctrl-1 = <&pinctrl_usdhc2_100mhz>;
> +	pinctrl-2 = <&pinctrl_usdhc2>;
> +	mmc-pwrseq = <&wifi_pwrseq>;
> +	vmmc-supply = <&reg_brcm>;
> +	bus-width = <4>;
> +	non-removable;
> +	keep-power-in-suspend;
> +	cap-power-off-card;
> +	status = "okay";
> +
> +	brcmf: bcrmf@1 {
> +		reg = <1>;
> +		compatible = "brcm,bcm4329-fmac";
> +	};
> +};
> +
> +&usdhc3 {
> +	pinctrl-names = "default", "state_100mhz", "state_200mhz", "sleep";
> +	pinctrl-0 = <&pinctrl_usdhc3>;
> +	pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
> +	pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
> +	pinctrl-3 = <&pinctrl_usdhc3>;
> +	assigned-clocks = <&clks IMX7D_USDHC3_ROOT_CLK>;
> +	assigned-clock-rates = <400000000>;
> +	bus-width = <8>;
> +	non-removable;
> +	status = "okay";
> +};
> +
> +&wdog1 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_wdog>;
> +	fsl,ext-reset-output;
> +};
> +
> +&iomuxc_lpsr {
> +	pinctrl_digitizer_reg: digitizerreggrp {
> +		fsl,pins = <
> +			/* DIGITIZER_PWR_EN */
> +			MX7D_PAD_LPSR_GPIO1_IO06__GPIO1_IO6	0x14
> +		>;
> +	};
> +};
> +
> +&iomuxc {
> +	pinctrl_brcm_reg: brcmreggrp {
> +		fsl,pins = <
> +			/* WIFI_PWR_EN */
> +			MX7D_PAD_SAI1_TX_BCLK__GPIO6_IO13	0x14
> +		>;
> +	};
> +
> +	pinctrl_uart1: uart1grp {
> +		fsl,pins = <
> +			MX7D_PAD_UART1_TX_DATA__UART1_DCE_TX	0x79
> +			MX7D_PAD_UART1_RX_DATA__UART1_DCE_RX	0x79
> +		>;
> +	};
> +
> +	pinctrl_uart6: uart6grp {
> +		fsl,pins = <
> +			MX7D_PAD_EPDC_DATA09__UART6_DCE_TX		0x79
> +			MX7D_PAD_EPDC_DATA08__UART6_DCE_RX		0x79
> +		>;
> +	};
> +
> +	pinctrl_usdhc2: usdhc2grp {
> +		fsl,pins = <
> +			MX7D_PAD_SD2_CMD__SD2_CMD		0x59
> +			MX7D_PAD_SD2_CLK__SD2_CLK		0x19
> +			MX7D_PAD_SD2_DATA0__SD2_DATA0		0x59
> +			MX7D_PAD_SD2_DATA1__SD2_DATA1		0x59
> +			MX7D_PAD_SD2_DATA2__SD2_DATA2		0x59
> +			MX7D_PAD_SD2_DATA3__SD2_DATA3		0x59
> +		>;
> +	};
> +
> +	pinctrl_usdhc2_100mhz: usdhc2grp_100mhz {
> +		fsl,pins = <
> +			MX7D_PAD_SD2_CMD__SD2_CMD		0x5a
> +			MX7D_PAD_SD2_CLK__SD2_CLK		0x1a
> +			MX7D_PAD_SD2_DATA0__SD2_DATA0		0x5a
> +			MX7D_PAD_SD2_DATA1__SD2_DATA1		0x5a
> +			MX7D_PAD_SD2_DATA2__SD2_DATA2		0x5a
> +			MX7D_PAD_SD2_DATA3__SD2_DATA3		0x5a
> +		>;
> +	};
> +
> +	pinctrl_usdhc2_200mhz: usdhc2grp_200mhz {
> +		fsl,pins = <
> +			MX7D_PAD_SD2_CMD__SD2_CMD		0x5b
> +			MX7D_PAD_SD2_CLK__SD2_CLK		0x1b
> +			MX7D_PAD_SD2_DATA0__SD2_DATA0		0x5b
> +			MX7D_PAD_SD2_DATA1__SD2_DATA1		0x5b
> +			MX7D_PAD_SD2_DATA2__SD2_DATA2		0x5b
> +			MX7D_PAD_SD2_DATA3__SD2_DATA3		0x5b
> +		>;
> +	};
> +
> +	pinctrl_usdhc3: usdhc3grp {
> +		fsl,pins = <
> +			MX7D_PAD_SD3_CMD__SD3_CMD		0x59
> +			MX7D_PAD_SD3_CLK__SD3_CLK		0x19
> +			MX7D_PAD_SD3_DATA0__SD3_DATA0		0x59
> +			MX7D_PAD_SD3_DATA1__SD3_DATA1		0x59
> +			MX7D_PAD_SD3_DATA2__SD3_DATA2		0x59
> +			MX7D_PAD_SD3_DATA3__SD3_DATA3		0x59
> +			MX7D_PAD_SD3_DATA4__SD3_DATA4		0x59
> +			MX7D_PAD_SD3_DATA5__SD3_DATA5		0x59
> +			MX7D_PAD_SD3_DATA6__SD3_DATA6		0x59
> +			MX7D_PAD_SD3_DATA7__SD3_DATA7		0x59
> +			MX7D_PAD_SD3_STROBE__SD3_STROBE		0x19
> +		>;
> +	};
> +
> +	pinctrl_usdhc3_100mhz: usdhc3grp_100mhz {
> +		fsl,pins = <
> +			MX7D_PAD_SD3_CMD__SD3_CMD		0x5a
> +			MX7D_PAD_SD3_CLK__SD3_CLK		0x1a
> +			MX7D_PAD_SD3_DATA0__SD3_DATA0		0x5a
> +			MX7D_PAD_SD3_DATA1__SD3_DATA1		0x5a
> +			MX7D_PAD_SD3_DATA2__SD3_DATA2		0x5a
> +			MX7D_PAD_SD3_DATA3__SD3_DATA3		0x5a
> +			MX7D_PAD_SD3_DATA4__SD3_DATA4		0x5a
> +			MX7D_PAD_SD3_DATA5__SD3_DATA5		0x5a
> +			MX7D_PAD_SD3_DATA6__SD3_DATA6		0x5a
> +			MX7D_PAD_SD3_DATA7__SD3_DATA7		0x5a
> +			MX7D_PAD_SD3_STROBE__SD3_STROBE		0x1a
> +		>;
> +	};
> +
> +	pinctrl_usdhc3_200mhz: usdhc3grp_200mhz {
> +		fsl,pins = <
> +			MX7D_PAD_SD3_CMD__SD3_CMD		0x5b
> +			MX7D_PAD_SD3_CLK__SD3_CLK		0x1b
> +			MX7D_PAD_SD3_DATA0__SD3_DATA0		0x5b
> +			MX7D_PAD_SD3_DATA1__SD3_DATA1		0x5b
> +			MX7D_PAD_SD3_DATA2__SD3_DATA2		0x5b
> +			MX7D_PAD_SD3_DATA3__SD3_DATA3		0x5b
> +			MX7D_PAD_SD3_DATA4__SD3_DATA4		0x5b
> +			MX7D_PAD_SD3_DATA5__SD3_DATA5		0x5b
> +			MX7D_PAD_SD3_DATA6__SD3_DATA6		0x5b
> +			MX7D_PAD_SD3_DATA7__SD3_DATA7		0x5b
> +			MX7D_PAD_SD3_STROBE__SD3_STROBE		0x1b
> +		>;
> +	};
> +
> +	pinctrl_wdog: wdoggrp {
> +		fsl,pins = <
> +			MX7D_PAD_ENET1_COL__WDOG1_WDOG_ANY	0x74
> +		>;
> +	};
> +
> +	pinctrl_wifi: wifigrp {
> +		fsl,pins = <
> +			/* WiFi Reg On */
> +			MX7D_PAD_SD2_CD_B__GPIO5_IO9		0x00000014
> +			/* WiFi Sleep 32k */
> +			MX7D_PAD_SD1_WP__CCM_CLKO2		0x00000014
> +		>;
> +	};
> +};
> -- 
> 2.30.0
>