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

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Date:	Tue, 1 Sep 2015 21:27:23 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Javier Martinez Canillas <javier@....samsung.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

W dniu 01.09.2015 o 21:18, Javier Martinez Canillas pisze:
> 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.

Okay. I'll update the patch by moving entire hsi2c_5 node to audio DTSI
(including "okay") and i2s0 thus disabling them on XU4.

Best regards,
Krzysztof

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