linux-kernel - Re: [PATCH 3/5] ARM: dts: introduce MPS2 AN385/AN386

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Message-ID: <571DEE47.3090208@arm.com>
Date:	Mon, 25 Apr 2016 11:15:35 +0100
From:	Vladimir Murzin <vladimir.murzin@....com>
To:	Matthias Brugger <mbrugger@...e.com>, sudeep.holla@....com
Cc:	lorenzo.pieralisi@....com, linux@....linux.org.uk, arnd@...db.de,
	liviu.dudau@....com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/5] ARM: dts: introduce MPS2 AN385/AN386

On 25/04/16 10:23, Matthias Brugger wrote:
> 
> 
> On 25/04/16 10:49, Vladimir Murzin wrote:
>> Application Notes 385 and 386 shares the same memory map and features
>> except the CPU is used. AN385 is supplied with Cortex-M3 CPU and AN386
>> is supplied with Cortex-M4.
>>
>> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
>> Signed-off-by: Vladimir Murzin <vladimir.murzin@....com>
>> ---
>>   arch/arm/boot/dts/Makefile       |    1 +
>>   arch/arm/boot/dts/mps2-an385.dts |   92 +++++++++++++++
>>   arch/arm/boot/dts/mps2.dtsi      |  241
>> ++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 334 insertions(+)
>>   create mode 100644 arch/arm/boot/dts/mps2-an385.dts
>>   create mode 100644 arch/arm/boot/dts/mps2.dtsi
>>
>> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
>> index 95c1923..1efa5a2 100644
>> --- a/arch/arm/boot/dts/Makefile
>> +++ b/arch/arm/boot/dts/Makefile
>> @@ -253,6 +253,7 @@ dtb-$(CONFIG_ARCH_MMP) += \
>>   dtb-$(CONFIG_MACH_MESON8B) += \
>>       meson8b-mxq.dtb \
>>       meson8b-odroidc1.dtb
>> +dtb-$(CONFIG_ARCH_MPS2) += mps2-an385.dtb
>>   dtb-$(CONFIG_ARCH_MOXART) += \
>>       moxart-uc7112lx.dtb
>>   dtb-$(CONFIG_SOC_IMX1) += \
>> diff --git a/arch/arm/boot/dts/mps2-an385.dts
>> b/arch/arm/boot/dts/mps2-an385.dts
>> new file mode 100644
>> index 0000000..d7cb594
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/mps2-an385.dts
>> @@ -0,0 +1,92 @@
>> +/*
>> + * Copyright (C) 2015 ARM Limited
>> + *
>> + * Author: Vladimir Murzin <vladimir.murzin@....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 "mps2.dtsi"
>> +
>> +/ {
>> +    model = "ARM MPS2 Application Note 385/386";
>> +    compatible = "arm,mps2";
>> +
>> +    aliases {
>> +        serial0 = &uart0;
>> +    };
>> +
>> +    chosen {
>> +        bootargs = "rdinit=/sbin/init earlycon";
> 
> The rootfs should be independent from the board.
> In my opinion, this type of bootargs should not be part of the DTS.

I have no strong opinion on this, but quick grep shows plenty places
where the same happens, and even [1] has rootfs specific option as an
example. So if there is no strong call to remove rdinit from bootargs,
I'd prefer to keep it as it makes testing easier for me.

[1] Documentation/devicetree/booting-without-of.txt

Cheers
Vladimir

> 
> Regards,
> Matthias
> 
>