linux-kernel - Re: [PATCHv6] ARM: exynos_defconfig: Enable LEDS for Odroid-XU3/XU4

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Message-ID: <CANAwSgT0u9iC9MSsbGz5L6n7XgB-fLLYhrN7sUPrn9GyN-2bGA@mail.gmail.com>
Date:	Thu, 3 Sep 2015 15:17:57 +0530
From:	Anand Moon <linux.amoon@...il.com>
To:	Javier Martinez Canillas <javier@....samsung.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Andreas Faerber <afaerber@...e.de>,
	Lukasz Majewski <l.majewski@...sung.com>,
	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: [PATCHv6] ARM: exynos_defconfig: Enable LEDS for Odroid-XU3/XU4

Hi Javier,

On 3 September 2015 at 14:50, Javier Martinez Canillas
<javier@....samsung.com> wrote:
> Hello Anand,
>
> On 09/03/2015 07:38 AM, Anand Moon wrote:
>> Enable config option NEW_LEDS, LEDS_CLASS, LEDS_GPIO, LEDS_PWM,
>> LEDS_TRIGGERS, LEDS_TRIGGER_TIMER, LEDS_TRIGGER_HEARTBEAT for
>> Odroid-XU3/XU4 board.
>>
>> Signed-off-by: Anand Moon <linux.amoon@...il.com>
>>
>> ---
>
> I think Krzysztof already mentioned but a commit message shouln't
> describe what the change is (one can look to the patch for that)
> but why the change is needed.
>
> So I would had expect something along these lines:
>
> Many Exynos boards (i.e: the Exynos5422 Odroid XU3/XU4) have GPIO
> and PWM based LEDs, so enable the needed Kconfig options to have
> support for these. Also, some boards use the heartbeat LED trigger
> so enable support for this as well.
>
>> Changes from last version
>> dropped following option.
>>   CONFIG_LEDS_CLASS_FLASH
>>   CONFIG_TRIGGER_ONESHOT
>>   CONFIG_TRIGGER_GPIO
>> fixed the From address
>> ---
>>  arch/arm/configs/exynos_defconfig | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/arch/arm/configs/exynos_defconfig b/arch/arm/configs/exynos_defconfig
>> index 9504e77..aaf7aa4 100644
>> --- a/arch/arm/configs/exynos_defconfig
>> +++ b/arch/arm/configs/exynos_defconfig
>> @@ -163,6 +163,13 @@ CONFIG_MMC_SDHCI_S3C_DMA=y
>>  CONFIG_MMC_DW=y
>>  CONFIG_MMC_DW_IDMAC=y
>>  CONFIG_MMC_DW_EXYNOS=y
>> +CONFIG_NEW_LEDS=y
>> +CONFIG_LEDS_CLASS=y
>> +CONFIG_LEDS_GPIO=y
>> +CONFIG_LEDS_PWM=y
>> +CONFIG_LEDS_TRIGGERS=y
>> +CONFIG_LEDS_TRIGGER_TIMER=y
>

> I don't see an Exynos board using the timer trigger. Do you need it for
> some user-space application that uses the sysfs interface? I'm OK with
> enabling it but again this should be mentioned in the commit message.
>
>> +CONFIG_LEDS_TRIGGER_HEARTBEAT=y
>>  CONFIG_RTC_CLASS=y
>>  CONFIG_RTC_DRV_MAX77686=y
>>  CONFIG_RTC_DRV_MAX77802=y
>>
>

Earlier design of the LED for Odroid XU3 was using gpio-leds
Now It was change to using both pwm-leds and gpio-leds.

Earlier I kept them as loadable module and now build-in.

Should I resend this again. Or some body will update the commit message.

-Anand Moon

> The change looks good to me though so with a better commit message:
>
> Reviewed-by: Javier Martinez Canillas <javier@....samsung.com>
>
> Best regards,
> --
> Javier Martinez Canillas
> Open Source Group
> Samsung Research America
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