linux-kernel - Re: [PATCH] ARM: dts: Add exynos5422-odroidxu4 board

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Date:	Tue, 1 Sep 2015 14:18:52 +0200
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Kukjin Kim <kgene@...nel.org>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org
Cc:	Anand Moon <linux.amoon@...il.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Inki Dae <inki.dae@...sung.com>, p.marczak@...sung.com,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH] ARM: dts: Add exynos5422-odroidxu4 board

Hello Krzysztof,

On 09/01/2015 02:00 PM, Krzysztof Kozlowski wrote:
> W dniu 01.09.2015 o 17:48, Javier Martinez Canillas pisze:

[snip]

>>>  
>>>  &hsi2c_5 {
>>>  	status = "okay";
>>
>> since I believe for the Odroid XU4 we would like this to be disabled.
>> The only I2C device in this I2C bus is the max98090 codec which is
>> not present in the XU4.
> 
> hsi2c_5 and i2s_0 are not used by board directly but are connected to
> external connector:
> http://www.hardkernel.com/main/products/prdt_info.php?g_code=G143452239825&tab_idx=2
> 
> This is the 12pin GPIO/I2C/I2S connector in bottom-right corner of board
> view.
>

Thanks for the info, I missed that.
 
> This is why I left this and is2_0 enabled on Odroid XU4 - I assumed
> someone may connect something to it. However I have doubts if it is

Yes, now it makes sense.

> usable in such state: without respective addresses and interrupts. In
> the same time OF_OVERLAY should customize it properly.
>
> What do you think?
>

As you said, these are not usable in the current form since if someone
wants to use it, has to add a dev node for the I2C device, possibly a
clock-frequency to change the default operating frequency, etc.

So has to either create a new DTS based on exynos5422-odroidxu4.dts or
as you said use OF overlays. IMHO these should be left disabled and be
enabled by users when adding the needed stuff.
 
> Thanks for review,
> Best regards,
> Krzysztof
> 

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America
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