Re: [PATCH 3/3] ARM: dts: sun7i: Add support for the Ainol AW1 tablet

[Maxime Ripard <maxime.ripard@bootlin.com>]

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Hi,

On Tue, Apr 10, 2018 at 11:31:29PM +0200, Paul Kocialkowski wrote:
> This adds support for the Ainol AW1, an A20-based 7" tablet from Ainol.
> 
> The following board-specific features are supported:
> * LCD panel
> * Backlight
> * USB OTG
> * Buttons
> * Touchscreen (doesn't work without non-free firmware)
> * Accelerometer
> * Battery
> 
> The following are untested:
> * Audio output
> * Audio speakers
> * USB via SPCI connector
> 
> The following are not supported:
> * Wi-Fi
> * Bluetooth
> * NAND
> * Audio via SPCI connector
> 
> Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
> ---
>  arch/arm/boot/dts/Makefile                |   1 +
>  arch/arm/boot/dts/sun7i-a20-ainol-aw1.dts | 358 ++++++++++++++++++++++++++++++
>  2 files changed, 359 insertions(+)
>  create mode 100644 arch/arm/boot/dts/sun7i-a20-ainol-aw1.dts
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 9f7133b6fba0..03bfacebfdbd 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -929,6 +929,7 @@ dtb-$(CONFIG_MACH_SUN6I) += \
>  	sun6i-a31s-sinovoip-bpi-m2.dtb \
>  	sun6i-a31s-yones-toptech-bs1078-v2.dtb
>  dtb-$(CONFIG_MACH_SUN7I) += \
> +	sun7i-a20-ainol-aw1.dtb \
>  	sun7i-a20-bananapi.dtb \
>  	sun7i-a20-bananapi-m1-plus.dtb \
>  	sun7i-a20-bananapro.dtb \
> diff --git a/arch/arm/boot/dts/sun7i-a20-ainol-aw1.dts b/arch/arm/boot/dts/sun7i-a20-ainol-aw1.dts
> new file mode 100644
> index 000000000000..697586991aea
> --- /dev/null
> +++ b/arch/arm/boot/dts/sun7i-a20-ainol-aw1.dts
> @@ -0,0 +1,358 @@
> +/*
> + * Copyright 2018 Paul Kocialkowski <contact@paulk.fr>
> + *
> + * This file is dual-licensed: you can use it either under the terms
> + * of the GPL or the X11 license, at your option. Note that this dual
> + * licensing only applies to this file, and not this project as a
> + * whole.
> + *
> + *  a) This file is free software; you can redistribute it and/or
> + *     modify it under the terms of the GNU General Public License as
> + *     published by the Free Software Foundation; either version 2 of the
> + *     License, or (at your option) any later version.
> + *
> + *     This file is distributed in the hope that it will be useful,
> + *     but WITHOUT ANY WARRANTY; without even the implied warranty of
> + *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + *     GNU General Public License for more details.
> + *
> + * Or, alternatively,
> + *
> + *  b) Permission is hereby granted, free of charge, to any person
> + *     obtaining a copy of this software and associated documentation
> + *     files (the "Software"), to deal in the Software without
> + *     restriction, including without limitation the rights to use,
> + *     copy, modify, merge, publish, distribute, sublicense, and/or
> + *     sell copies of the Software, and to permit persons to whom the
> + *     Software is furnished to do so, subject to the following
> + *     conditions:
> + *
> + *     The above copyright notice and this permission notice shall be
> + *     included in all copies or substantial portions of the Software.
> + *
> + *     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> + *     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
> + *     OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> + *     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
> + *     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
> + *     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + *     FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> + *     OTHER DEALINGS IN THE SOFTWARE.

Can you use an SPDX header instead of the whole license text?

> + */
> +
> +/dts-v1/;
> +#include "sun7i-a20.dtsi"
> +#include "sunxi-common-regulators.dtsi"
> +
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/input/input.h>
> +#include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/pwm/pwm.h>
> +
> +/ {
> +	model = "Ainol AW1";
> +	compatible = "ainol,ainol-aw1", "allwinner,sun7i-a20";
> +
> +	aliases {
> +		serial0 = &uart0;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};
> +
> +	backlight: backlight {
> +		compatible = "pwm-backlight";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&backlight_enable_pin>;

You don't need any of the pinctrl nodes for the GPIOs

> +		pwms = <&pwm 0 50000 PWM_POLARITY_INVERTED>;
> +		brightness-levels = <0 10 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <5>;
> +		enable-gpios = <&pio 7 7 GPIO_ACTIVE_HIGH>; /* PH7 */
> +	};
> +
> +	panel: panel {
> +		compatible = "innolux,at070tn92";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		power-supply = <&panel_power>;
> +		backlight = <&backlight>;
> +
> +		port@0 {
> +			reg = <0>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			panel_input: endpoint@0 {
> +				reg = <0>;
> +				remote-endpoint = <&tcon0_out_panel>;
> +			};
> +		};
> +	};
> +
> +	panel_power: panel_power {
> +		compatible = "regulator-fixed";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&panel_power_pin>;
> +		regulator-name = "panel-power";
> +		regulator-min-microvolt = <10400000>;
> +		regulator-max-microvolt = <10400000>;
> +		gpio = <&pio 7 8 GPIO_ACTIVE_HIGH>; /* PH8 */
> +		enable-active-high;

Sigh, we should really convert regulator-fixed to use the proper GPIO
API here...

> +		regulator-boot-on;
> +	};
> +};
> +
> +&codec {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&codec_pa_pin>;
> +	allwinner,pa-gpios = <&pio 7 15 GPIO_ACTIVE_HIGH>; /* PH15 */
> +	status = "okay";
> +};
> +
> +&cpu0 {
> +	cpu-supply = <&reg_dcdc2>;
> +};

How was CPUfreq tested?

> +
> +&de {
> +	status = "okay";
> +};
> +
> +&ehci0 {
> +	status = "okay";
> +};
> +
> +&ehci1 {
> +	status = "okay";
> +};
> +
> +&i2c0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&i2c0_pins_a>;
> +	status = "okay";
> +
> +	axp209: pmic@34 {
> +		reg = <0x34>;
> +		interrupt-parent = <&nmi_intc>;
> +		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
> +	};
> +};
> +
> +&i2c1 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&i2c1_pins_a>;
> +	status = "okay";
> +
> +	lis3dh: accelerometer@18 {
> +		compatible = "st,lis3dh-accel";
> +		reg = <0x18>;
> +		vdd-supply = <&reg_vcc3v3>;
> +		vddio-supply = <&reg_vcc3v3>;
> +		st,drdy-int-pin = <1>;
> +	};
> +};
> +
> +&i2c2 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&i2c2_pins_a>;
> +	status = "okay";
> +	clock-frequency = <400000>; /* 400 KHz required for GSL1680. */

I'm not sure that comment is worth it. The only device there is the
touchscreen, so it's kind of obvious that it's the device that needs
that frequency.

> +
> +	gsl1680: touchscreen@40 {
> +		compatible = "silead,gsl1680";
> +		reg = <0x40>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&touchscreen_power_pin>;
> +		interrupt-parent = <&pio>;
> +		interrupts = <7 21 IRQ_TYPE_EDGE_FALLING>; /* EINT21 (PH21) */
> +		power-gpios = <&pio 7 20 GPIO_ACTIVE_HIGH>; /* PH20 */
> +		firmware-name = "gsl1680-ainol-aw1.fw";
> +		touchscreen-size-x = <480>;
> +		touchscreen-size-y = <800>;
> +		touchscreen-swapped-x-y;
> +		touchscreen-inverted-y;
> +		silead,max-fingers = <5>;
> +	};
> +};
> +
> +&lradc {
> +	vref-supply = <&reg_vcc3v0>;

You should use the proper regulator from the PMIC here.

> +	status = "okay";
> +
> +	button@571 {
> +		label = "Volume Up";
> +		linux,code = <KEY_VOLUMEUP>;
> +		channel = <0>;
> +		voltage = <571428>;
> +	};
> +
> +	button@761 {
> +		label = "Volume Down";
> +		linux,code = <KEY_VOLUMEDOWN>;
> +		channel = <0>;
> +		voltage = <761904>;
> +	};
> +
> +	button@952 {
> +		label = "Home";
> +		linux,code = <KEY_HOME>;
> +		channel = <0>;
> +		voltage = <952380>;
> +	};
> +};
> +
> +&mmc0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&mmc0_pins_a>;
> +	vmmc-supply = <&reg_vcc3v3>;

And here too.

> +	bus-width = <4>;
> +	cd-gpios = <&pio 7 1 GPIO_ACTIVE_HIGH>; /* PH1 */
> +	cd-inverted;
> +	status = "okay";
> +};
> +
> +&ohci0 {
> +	status = "okay";
> +};
> +
> +&ohci1 {
> +	status = "okay";
> +};
> +
> +&otg_sram {
> +	status = "okay";
> +};
> +
> +&pio {
> +	panel_power_pin: panel_power_pin@0 {
> +		pins = "PH8";
> +		function = "gpio_out";
> +	};
> +
> +	backlight_enable_pin: backlight_enable_pin@0 {
> +		pins = "PH7";
> +		function = "gpio_out";
> +	};
> +
> +	touchscreen_power_pin: touchscreen_power_pin@0 {
> +		pins = "PH20";
> +		function = "gpio_out";
> +	};
> +
> +	codec_pa_pin: codec_pa_pin@0 {
> +		pins = "PH15";
> +		function = "gpio_out";
> +	};
> +
> +	usb0_id_detect_pin: usb0_id_detect_pin@0 {
> +		pins = "PH4";
> +		function = "gpio_in";
> +		bias-pull-up;
> +	};
> +
> +	usb0_vbus_pin: usb0_vbus_pin@0 {
> +		pins = "PB9";
> +		function = "gpio_out";
> +	};
> +
> +	usb1_vbus_pin: usb1_vbus_pin@0 {
> +		pins = "PH6";
> +		function = "gpio_out";
> +	};
> +
> +	usb2_vbus_pin: usb2_vbus_pin@0 {
> +		pins = "PH3";
> +		function = "gpio_out";
> +	};
> +};
> +
> +&pwm {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pwm0_pins_a>;
> +	status = "okay";
> +};
> +
> +&tcon0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&lcd_rgb666_pins>;
> +	status = "okay";
> +};
> +
> +&tcon0_out {
> +	tcon0_out_panel: endpoint@0 {
> +		reg = <0>;
> +		remote-endpoint = <&panel_input>;
> +	};
> +};
> +
> +&uart0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&uart0_pins_a>;
> +	status = "okay";
> +};
> +
> +&usb_otg {
> +	dr_mode = "otg";
> +	status = "okay";
> +};
> +
> +&usbphy {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&usb0_id_detect_pin>;
> +	usb0_id_det-gpio = <&pio 7 4 GPIO_ACTIVE_HIGH>; /* PH4 */
> +	usb0_vbus_power-supply = <&usb_power_supply>;
> +	usb0_vbus-supply = <&reg_usb0_vbus>;
> +	usb1_vbus-supply = <&reg_usb1_vbus>;
> +	usb2_vbus-supply = <&reg_usb2_vbus>;

And here as well.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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