linux-kernel - Re: [PATCHv4 7/7] ARM: dts: Add device tree sources for Exynos3250

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Date:	Fri, 09 May 2014 10:01:12 +0200
From:	Tomasz Figa <t.figa@...sung.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>
Cc:	kgene.kim@...sung.com, linux-kernel@...r.kernel.org,
	linux@....linux.org.uk, ben-linux@...ff.org, arnd@...db.de,
	olof@...om.net, marc.zyngier@....com, thomas.abraham@...aro.org,
	kyungmin.park@...sung.com, inki.dae@...sung.com,
	sw0312.kim@...sung.com, hyunhee.kim@...sung.com,
	yj44.cho@...sung.com, chanho61.park@...sung.com,
	sajjan.linux@...il.com, tushar.behera@...aro.org,
	sachin.kamat@...aro.org, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCHv4 7/7] ARM: dts: Add device tree sources for Exynos3250

On 09.05.2014 08:49, Chanwoo Choi wrote:
> Hi Tomasz,
> 
> On 04/26/2014 08:38 PM, Tomasz Figa wrote:
>> On 26.04.2014 02:51, Tomasz Figa wrote:
>>> Hi Chanwoo,
>>>
>>> On 25.04.2014 03:16, Chanwoo Choi wrote:
>>>> From: Tomasz Figa <t.figa@...sung.com>
>>>>
>>>> This patch add new exynos3250.dtsi to support Exynos3250 SoC based on
>>>> Cortex-A7
>>>> dual core and includes following dt nodes:
>>>>
>>>> - GIC interrupt controller
>>>> - Pinctrl to control GPIOs
>>>> - Clock controller
>>>> - CPU information (Cortex-A7 dual core)
>>>> - UART to support serial port
>>>> - MCT (Multi Core Timer)
>>>> - ADC (Analog Digital Converter)
>>>> - I2C/SPI bus
>>>> - Power domain
>>>> - PMU (Performance Monitoring Unit)
>>>> - MSHC (Mobile Storage Host Controller)
>>>> - PWM (Pluse Width Modulation)
>>>> - AMBA bus
>>>>
>>>> Signed-off-by: Tomasz Figa <t.figa@...sung.com>
>>>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>>>> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
>>>> Signed-off-by: Inki Dae <inki.dae@...sung.com>
>>>> Signed-off-by: Hyunhee Kim <hyunhee.kim@...sung.com>
>>>> Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
>>>> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
>>>> Cc: Ben Dooks <ben-linux@...ff.org>
>>>> Cc: Kukjin Kim <kgene.kim@...sung.com>
>>>> Cc: Rob Herring <robh+dt@...nel.org>
>>>> Cc: Pawel Moll <pawel.moll@....com>
>>>> Cc: Mark Rutland <mark.rutland@....com>
>>>> Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
>>>> Cc: Kumar Gala <galak@...eaurora.org>
>>>> Cc: Russell King <linux@....linux.org.uk>
>>>> Cc: devicetree@...r.kernel.org
>>>> ---
>>>>   arch/arm/boot/dts/exynos3250-pinctrl.dtsi | 477 +++++++++++++++
>>>>   arch/arm/boot/dts/exynos3250.dtsi         | 405 +++++++++++++
>>>>   arch/arm/boot/dts/exynos4212-tizenw.dts   | 926
>>>> ++++++++++++++++++++++++++++++
>>>>   3 files changed, 1808 insertions(+)
>>>>   create mode 100644 arch/arm/boot/dts/exynos3250-pinctrl.dtsi
>>>>   create mode 100644 arch/arm/boot/dts/exynos3250.dtsi
>>>>   create mode 100644 arch/arm/boot/dts/exynos4212-tizenw.dts
>>>>
>>>> diff --git a/arch/arm/boot/dts/exynos3250-pinctrl.dtsi
>>>> b/arch/arm/boot/dts/exynos3250-pinctrl.dtsi
>>>> new file mode 100644
>>>> index 0000000..976490b
>>>> --- /dev/null
>>>> +++ b/arch/arm/boot/dts/exynos3250-pinctrl.dtsi
>>>> @@ -0,0 +1,477 @@
>>>> +/*
>>>> + * Samsung's Exynos3250 SoCs pin-mux and pin-config device tree source
>>>> + *
>>>> + * Copyright (c) 2014 Samsung Electronics Co., Ltd.
>>>> + *        http://www.samsung.com
>>>> + *
>>>> + * Samsung's Exynos3250 SoCs pin-mux and pin-config optiosn are
>>>> listed as device
>>>> + * tree nodes are listed in this file.
>>>> + *
>>>> + * This program is free software; you can redistribute it and/or modify
>>>> + * it under the terms of the GNU General Public License version 2 as
>>>> + * published by the Free Software Foundation.
>>>> +*/
>>>> +
>>>> +/ {
>>>> +    pinctrl@...00000 {
>>>
>>> Could you use references instead of re-specifying the whole tree
>>> hierarchy in every file a node is used?
>>>
>>> Instead of
>>>
>>> / {
>>>      pinctrl@...00000 {
>>>
>>>      };
>>> };
>>>
>>> one may simply use
>>>
>>> &pinctrl_0 {
>>>
>>> };
>>>
>>> You might just need to change the location of #include
>>> "exynos3250-pinctrl.dtsi" from top of exynos3250.dtsi to bottom of it.
>>
>> Oh, well, you also should move all nodes of on-SoC devices under a simple-bus node called soc. You can see the patch adding dts file for Exynos5260 for an example [1].
>>
>> [1] http://thread.gmane.org/gmane.linux.kernel.samsung-soc/29360/focus=29361
> 
> 
> OK, I'll move nodes dependent on SoC under 'soc' dt node as example patch[1] except for 'amba-bus' dt node.

I don't see any reason why amba-bus node shouldn't be under soc node as
well. Any on-chip devices should be.

Best regards,
Tomasz
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