linux-kernel - Re: [PATCH 3/3] ARM: dts: exynos5422-odroidxu3: Added UHS-I bus speed support

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Date:	Tue, 13 Oct 2015 09:14:38 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Anand Moon <linux.amoon@...il.com>
Cc:	Kukjin Kim <kgene@...nel.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Lukasz Majewski <l.majewski@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] ARM: dts: exynos5422-odroidxu3: Added UHS-I bus speed
 support

On 13.10.2015 00:32, Anand Moon wrote:
> Hi Krzysztof,
> 
> On 12 October 2015 at 11:14, Krzysztof Kozlowski
> <k.kozlowski@...sung.com> wrote:
>> On 12.10.2015 00:46, Anand Moon wrote:
>>> Added support for UHS-I bus speed 50MB/s (SDR50, DDR50) 104MB/s (SDR104)
>>
>> This description is not entirely correct. The MMC driver already
>> supports these UHS speeds (you did not any code) so you rather enabled
>> it (description of bindings says "is supported").
>>
>> You mentioned DDR50 but I don't see respective property below.
>>
>> How do you know that these modes are really supported? I don't know. Can
>> you convince me?
> 
> Setting this DDR50 capability give me this error. That's the reason to
> drop this capability.

But you mentioned it in commit message! "Added support for UHS-I ...
(DDR50)"

In the same time dropping DDR50 is not an sufficient proof that "SDR50
and SDR104 are really supported".

Best regards,
Krzysztof

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