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Date:   Thu, 02 Nov 2017 17:07:30 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     maxime.ripard@...e-electrons.com
Cc:     Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [linux-sunxi] Re: [PATCH] ARM: sun8i: h2+: add support for Banana
 Pi M2 Zero board

在 2017-11-02 17:02,Maxime Ripard 写道:
> Hi,
> 
> On Wed, Nov 01, 2017 at 05:38:14PM +0800, Icenowy Zheng wrote:
>> Banana Pi M2 Zero board is a H2+-based board by Sinovoip, with a form
>> factor and GPIO holes similar to Raspberry Pi Zero.
>> 
>> It features:
>> - Allwinner H2+ SoC
>> - Single-chip (16-bit) 512MiB DDR3 DRAM
>> - Ampak AP6212 Wi-Fi/Bluetooth module
>> - MicroSD slot
>> - Two MicroUSB Type-B ports (one can only be used to power the board 
>> and
>>   the other features OTG functionality)
>> - Two keys, a reset and a GPIO-connected key.
>> - HDMI Type-C (miniHDMI) connector connected to the HDMI part of H2+.
>> - CSI connector to connect the camera sensor provided by Sinovoip.
>> 
>> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
>> ---
>>  arch/arm/boot/dts/Makefile                         |   1 +
>>  .../boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts    | 156 
>> +++++++++++++++++++++
>>  2 files changed, 157 insertions(+)
>>  create mode 100644 
>> arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts
>> 
>> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
>> index 3a5b79fd8198..803dbdf03916 100644
>> --- a/arch/arm/boot/dts/Makefile
>> +++ b/arch/arm/boot/dts/Makefile
>> @@ -930,6 +930,7 @@ dtb-$(CONFIG_MACH_SUN8I) += \
>>  	sun8i-a83t-bananapi-m3.dtb \
>>  	sun8i-a83t-cubietruck-plus.dtb \
>>  	sun8i-a83t-tbs-a711.dtb \
>> +	sun8i-h2-plus-bananapi-m2-zero.dtb \
>>  	sun8i-h2-plus-orangepi-zero.dtb \
>>  	sun8i-h3-bananapi-m2-plus.dtb \
>>  	sun8i-h3-beelink-x2.dtb \
>> diff --git a/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts 
>> b/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts
>> new file mode 100644
>> index 000000000000..414258da4308
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts
>> @@ -0,0 +1,156 @@
>> +/*
>> + * Copyright (C) 2017 Icenowy Zheng <icenowy@...c.io>
>> + *
>> + * Based on sun8i-h3-bananapi-m2-plus.dts, which is:
>> + *   Copyright (C) 2016 Chen-Yu Tsai <wens@...e.org>
>> + *
>> + * 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.
>> + */
>> +
>> +/dts-v1/;
>> +#include "sun8i-h3.dtsi"
>> +#include "sunxi-common-regulators.dtsi"
>> +
>> +#include <dt-bindings/gpio/gpio.h>
>> +#include <dt-bindings/input/input.h>
>> +
>> +/ {
>> +	model = "Banana Pi BPI-M2-Zero";
>> +	compatible = "sinovoip,bpi-m2-zero", "allwinner,sun8i-h2-plus";
>> +
>> +	aliases {
>> +		serial0 = &uart0;
>> +		serial1 = &uart1;
>> +	};
>> +
>> +	chosen {
>> +		stdout-path = "serial0:115200n8";
>> +	};
>> +
>> +	leds {
>> +		compatible = "gpio-leds";
>> +		pinctrl-names = "default";
> 
> This property is useless
> 
>> +
>> +		pwr_led {
>> +			label = "bananapi-m2-zero:red:pwr";
>> +			gpios = <&r_pio 0 10 GPIO_ACTIVE_HIGH>; /* PL10 */
>> +			default-state = "on";
>> +		};
>> +	};
>> +
>> +	gpio_keys {
>> +		compatible = "gpio-keys";
>> +		pinctrl-names = "default";
> 
> Same thing here.
> 
>> +
>> +		sw4 {
> 
> That node should be called power.
> 
>> +			label = "power";
>> +			linux,code = <BTN_0>;
>> +			gpios = <&r_pio 0 3 GPIO_ACTIVE_LOW>;
>> +		};
>> +	};
>> +
>> +	wifi_pwrseq: wifi_pwrseq {
>> +		compatible = "mmc-pwrseq-simple";
>> +		pinctrl-names = "default";
> 
> That property is useless
> 
>> +		reset-gpios = <&r_pio 0 7 GPIO_ACTIVE_LOW>; /* PL7 */
>> +	};
>> +};
>> +
>> +&ehci0 {
>> +	status = "okay";
>> +};
>> +
>> +&mmc0 {
>> +	pinctrl-names = "default";
>> +	pinctrl-0 = <&mmc0_pins_a>;
>> +	vmmc-supply = <&reg_vcc3v3>;
>> +	bus-width = <4>;
>> +	/*
>> +	 * In different revisions the board have different card detect
>> +	 * configuration.
>> +	 */
> 
> Which ones?

In the sample batch (1.2V fixed voltage) the card detect is normal
(PF6 low as inserted), however in the final batch (1.1V/1.3V
switchable) it's inverted at PF6 (high as inserted).

> 
>> +	broken-cd;
>> +	status = "okay";
>> +};
>> +
>> +&mmc1 {
>> +	pinctrl-names = "default";
>> +	pinctrl-0 = <&mmc1_pins_a>;
>> +	vmmc-supply = <&reg_vcc3v3>;
>> +	vqmmc-supply = <&reg_vcc3v3>;
>> +	mmc-pwrseq = <&wifi_pwrseq>;
>> +	bus-width = <4>;
>> +	non-removable;
>> +	status = "okay";
>> +
>> +	brcmf: wifi@1 {
>> +		reg = <1>;
>> +		compatible = "brcm,bcm4329-fmac";
>> +		interrupt-parent = <&pio>;
>> +		interrupts = <6 10 IRQ_TYPE_LEVEL_LOW>; /* PG10 / EINT10 */
>> +		interrupt-names = "host-wake";
>> +	};
>> +};
>> +
>> +&ohci0 {
>> +	status = "okay";
>> +};
>> +
>> +&uart0 {
>> +	pinctrl-names = "default";
>> +	pinctrl-0 = <&uart0_pins_a>;
>> +	status = "okay";
>> +};
>> +
>> +&uart1 {
>> +	pinctrl-names = "default";
>> +	pinctrl-0 = <&uart1_pins>, <&uart1_rts_cts_pins>;
>> +	status = "okay";
>> +};
>> +
>> +&usb_otg {
>> +	dr_mode = "otg";
>> +	status = "okay";
>> +};
>> +
>> +&usbphy {
>> +	usb0_id_det-gpios = <&r_pio 0 6 GPIO_ACTIVE_HIGH>; /* PL6 */
>> +	/* USB OTG VBUS is directly connected to 5V without any regulators 
>> */
> 
> So it cannot operate in OTG, but it's host only?

It can operate in OTG -- you can power the board via the OTG port, as
the VBUS is not gated from 5V at all, so 5V power at VBUS will power up 
the
board. Yes, it's a bit unsafe, but the board designer did it.

> 
> Maxime
> 
> --
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com

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