Message-ID: <20161124212930.truoiherpczbabh7@lukather>
Date:   Thu, 24 Nov 2016 22:29:30 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Icenowy Zheng <icenowy@...c.xyz>, Jonathan Corbet <corbet@....net>,
        Chen-Yu Tsai <wens@...e.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Hans de Goede <hdegoede@...hat.com>,
        Vishnu Patekar <vishnupatekar0510@...il.com>,
        Arnd Bergmann <arnd@...db.de>, linux-doc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/3] ARM: dts: sunxi: add support for Orange Pi Zero
 board

On Wed, Nov 23, 2016 at 09:23:49AM +0000, Andre Przywara wrote:
> Hi Maxime,
> 
> On 23/11/16 07:57, Maxime Ripard wrote:
> > On Tue, Nov 22, 2016 at 12:24:20AM +0800, Icenowy Zheng wrote:
> >> Orange Pi Zero is a board that came with the new Allwinner H2+ SoC.
> >>
> >> Add a device tree file for it.
> >>
> >> Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
> >> ---
> >> Changes since v2:
> >> - Use generic pinconf binding instead of legacy allwinner pinctrl binding.
> >> - removed uart3, which is not accessible on Orange Pi Zero.
> >> - Removed sun8i-h2plus.dtsi and make Orange Pi Zero dts directly include
> >>   sun8i-h3.dtsi.
> >> - Removed allwinner,sun8i-h3 compatible.
> >>
> >>  arch/arm/boot/dts/Makefile                       |   1 +
> >>  arch/arm/boot/dts/sun8i-h2plus-orangepi-zero.dts | 137 +++++++++++++++++++++++
> > 
> > Ditto, h2-plus-orangepi-zero.
> > 
> >>  2 files changed, 138 insertions(+)
> >>  create mode 100644 arch/arm/boot/dts/sun8i-h2plus-orangepi-zero.dts
> >>
> >> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> >> index 802a10d..51a1dd7 100644
> >> --- a/arch/arm/boot/dts/Makefile
> >> +++ b/arch/arm/boot/dts/Makefile
> >> @@ -834,6 +834,7 @@ dtb-$(CONFIG_MACH_SUN8I) += \
> >>  	sun8i-a33-sinlinx-sina33.dtb \
> >>  	sun8i-a83t-allwinner-h8homlet-v2.dtb \
> >>  	sun8i-a83t-cubietruck-plus.dtb \
> >> +	sun8i-h2plus-orangepi-zero.dtb \
> >>  	sun8i-h3-bananapi-m2-plus.dtb \
> >>  	sun8i-h3-nanopi-neo.dtb \
> >>  	sun8i-h3-orangepi-2.dtb \
> >> diff --git a/arch/arm/boot/dts/sun8i-h2plus-orangepi-zero.dts b/arch/arm/boot/dts/sun8i-h2plus-orangepi-zero.dts
> >> new file mode 100644
> >> index 0000000..b428e47
> >> --- /dev/null
> >> +++ b/arch/arm/boot/dts/sun8i-h2plus-orangepi-zero.dts
> >> @@ -0,0 +1,137 @@
> >> +/*
> >> + * Copyright (C) 2016 Icenowy Zheng <icenowy@...c.xyz>
> >> + *
> >> + * Based on sun8i-h3-orangepi-one.dts, which is:
> >> + *   Copyright (C) 2016 Hans de Goede <hdegoede@...hat.com>
> >> + *
> >> + * 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>
> >> +#include <dt-bindings/pinctrl/sun4i-a10.h>
> >> +
> >> +/ {
> >> +	model = "Xunlong Orange Pi Zero";
> >> +	compatible = "xunlong,orangepi-zero", "allwinner,sun8i-h2plus";
> >> +
> >> +	aliases {
> >> +		serial0 = &uart0;
> >> +	};
> >> +
> >> +	chosen {
> >> +		stdout-path = "serial0:115200n8";
> >> +	};
> >> +
> >> +	leds {
> >> +		compatible = "gpio-leds";
> >> +		pinctrl-names = "default";
> >> +		pinctrl-0 = <&leds_opi0>, <&leds_r_opi0>;
> >> +
> >> +		pwr_led {
> >> +			label = "orangepi:green:pwr";
> >> +			gpios = <&r_pio 0 10 GPIO_ACTIVE_HIGH>;
> >> +			default-state = "on";
> >> +		};
> >> +
> >> +		status_led {
> >> +			label = "orangepi:red:status";
> >> +			gpios = <&pio 0 17 GPIO_ACTIVE_HIGH>;
> >> +		};
> >> +	};
> >> +};
> >> +
> >> +&ehci1 {
> >> +	status = "okay";
> >> +};
> >> +
> >> +&mmc0 {
> >> +	pinctrl-names = "default";
> >> +	pinctrl-0 = <&mmc0_pins_a>, <&mmc0_cd_pin>;
> >> +	vmmc-supply = <&reg_vcc3v3>;
> >> +	bus-width = <4>;
> >> +	cd-gpios = <&pio 5 6 GPIO_ACTIVE_HIGH>; /* PF6 */
> >> +	cd-inverted;
> >> +	status = "okay";
> >> +};
> >> +
> >> +&ohci1 {
> >> +	status = "okay";
> >> +};
> >> +
> >> +&pio {
> >> +	leds_opi0: led_pins@0 {
> >> +		pins = "PA17";
> >> +		function = "gpio_out";
> >> +	};
> >> +};
> >> +
> >> +&r_pio {
> >> +	leds_r_opi0: led_pins@0 {
> >> +		pins = "PL10";
> >> +		function = "gpio_out";
> >> +	};
> >> +};
> >> +
> >> +&uart0 {
> >> +	pinctrl-names = "default";
> >> +	pinctrl-0 = <&uart0_pins_a>;
> >> +	status = "okay";
> >> +};
> >> +
> >> +&uart1 {
> >> +	pinctrl-names = "default";
> >> +	pinctrl-0 = <&uart1_pins>;
> >> +	status = "disabled";
> >> +};
> >> +
> >> +&uart2 {
> >> +	pinctrl-names = "default";
> >> +	pinctrl-0 = <&uart2_pins>;
> >> +	status = "disabled";
> >> +};
> > 
> > I'm not sure you answered me on this one. Are those exposed on the
> > headers? why did you put them as disabled here?
> 
> So they are on headers, though you have to solder the actual header pins
> yourself [1]. But also these are the normal pins multiplexed with GPIOs
> and other peripherals, so keeping them disabled is in line with the
> existing policy, if I got this correctly.
> 
> I agree that the status="disabled" is redundant, since we have that
> exact line already in the .dtsi. But I saw it in other DTs as well, most
> prominently in the sun8i-h3-orangepi-one.dts.
> 
> So I think we should remove the "status=" lines here, dtc will generate
> an identical dtb out of it. But we should keep the uart descriptions in
> to make it easier for users to see which SoC pins are used for these
> pins labeled UART[012] in the board description and schematic. Also all
> it takes to enable those is to overwrite the status property, which can
> easily be done inline (without resizing the dtb).

I'd rather have the status still in the DTS. It's true that it's
redundant, but it's also explicit. A node without any status would
give the impression that it is actually enabled, especially since a
node without a status is going to be probed.

Maxime

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

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