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

From: Chanwoo Choi <cw00.choi@samsung.com>
To: Tomasz Figa <t.figa@samsung.com>
Cc: Tomasz Figa <tomasz.figa@gmail.com>,
	kgene.kim@samsung.com, linux-kernel@vger.kernel.org,
	linux@arm.linux.org.uk, ben-linux@fluff.org, arnd@arndb.de,
	olof@lixom.net, marc.zyngier@arm.com, thomas.abraham@linaro.org,
	kyungmin.park@samsung.com, inki.dae@samsung.com,
	sw0312.kim@samsung.com, hyunhee.kim@samsung.com,
	yj44.cho@samsung.com, chanho61.park@samsung.com,
	sajjan.linux@gmail.com, tushar.behera@linaro.org,
	sachin.kamat@linaro.org, linux-samsung-soc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
	Jaehoon Chung <jh80.chung@samsung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	Kumar Gala <galak@codeaurora.org>
Subject: Re: [PATCHv4 7/7] ARM: dts: Add device tree sources for Exynos3250
Date: Fri, 09 May 2014 17:15:12 +0900	[thread overview]
Message-ID: <536C8E90.6030607@samsung.com> (raw)
In-Reply-To: <536C8B48.90706@samsung.com>

Hi Tomasz,

On 05/09/2014 05:01 PM, Tomasz Figa wrote:
> 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@samsung.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@samsung.com>
>>>>> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
>>>>> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
>>>>> Signed-off-by: Inki Dae <inki.dae@samsung.com>
>>>>> Signed-off-by: Hyunhee Kim <hyunhee.kim@samsung.com>
>>>>> Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
>>>>> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
>>>>> Cc: Ben Dooks <ben-linux@fluff.org>
>>>>> Cc: Kukjin Kim <kgene.kim@samsung.com>
>>>>> Cc: Rob Herring <robh+dt@kernel.org>
>>>>> Cc: Pawel Moll <pawel.moll@arm.com>
>>>>> Cc: Mark Rutland <mark.rutland@arm.com>
>>>>> Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
>>>>> Cc: Kumar Gala <galak@codeaurora.org>
>>>>> Cc: Russell King <linux@arm.linux.org.uk>
>>>>> Cc: devicetree@vger.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@11400000 {
>>>>
>>>> Could you use references instead of re-specifying the whole tree
>>>> hierarchy in every file a node is used?
>>>>
>>>> Instead of
>>>>
>>>> / {
>>>>      pinctrl@11400000 {
>>>>
>>>>      };
>>>> };
>>>>
>>>> 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.

I didn't understand the correct meaning of 'simple-bus'.
OK, I'll move 'amba-bus' dt node under 'soc' dt node.

Best Regards,
Chanwoo Choi