linux-kernel - Re: [PATCH v1.1] ARM: multi_v7_defconfig: Enable power sequence for Odroid U3

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Date:   Mon, 9 Jan 2017 14:44:54 -0300
From:   Javier Martinez Canillas <javier@....samsung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Kukjin Kim <kgene@...nel.org>, Anand Moon <linux.amoon@...il.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Peter Chen <peter.chen@....com>, gregkh@...uxfoundation.org,
        stern@...land.harvard.edu, ulf.hansson@...aro.org,
        broonie@...nel.org, sre@...nel.org, robh+dt@...nel.org,
        linux-usb@...r.kernel.org, linux-pm@...r.kernel.org,
        hverkuil@...all.nl, Markus Reichl <m.reichl@...etechno.de>
Subject: Re: [PATCH v1.1] ARM: multi_v7_defconfig: Enable power sequence for
 Odroid U3

Hello Krzysztof,

On 01/09/2017 02:38 PM, Krzysztof Kozlowski wrote:
> On Mon, Jan 9, 2017 at 6:24 PM, Javier Martinez Canillas
> <javier@....samsung.com> wrote:
>> Hello Krzysztof,
>>
>> I think it would had been clearer if the subject prefix was "[PATCH v1.1 4/4]" :)
> 
> Ah, yes.
> 
>>
>> On 01/07/2017 06:16 AM, Krzysztof Kozlowski wrote:
>>> Odroid U3 needs a power sequence for lan9730, if it was enabled by
>>> bootloader.  Also enable the USB3503 HSCI to USB2.0 driver (device
>>> is present on Odroid U3).
>>>
>>> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
>>>
>>> ---
>>>
>>
>> Do you think that makes sense to also enable GPIO_SYS for debugging
>> purposes as you do in patch 3/4?
> 
> I like the GPIO_SYSFS interface because it is easy to use. However
> now, after your question, I found this:
> http://lists.infradead.org/pipermail/linux-arm-kernel/2016-November/470154.html
> ARM/ARM64: defconfig: drop GPIO_SYSFS on multiplatforms
> 
> ... so instead I will drop it from exynos_defconfig.
> 

Right, I forgot that using the GPIO sysfs interface is discouraged now and the
new chardev/ioctl based should be used instead. So it makes sense to drop it.

> Best regards,
> Krzysztof

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