linux-kernel - Re: [PATCH/RFC v9 04/19] mfd: max77693: adjust max77693_led_platform

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Date:	Tue, 09 Dec 2014 10:09:24 +0100
From:	Jacek Anaszewski <j.anaszewski@...sung.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-leds@...r.kernel.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, kyungmin.park@...sung.com,
	b.zolnierkie@...sung.com, pavel@....cz, cooloney@...il.com,
	rpurdie@...ys.net, sakari.ailus@....fi, s.nawrocki@...sung.com,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	Chanwoo Choi <cw00.choi@...sung.com>
Subject: Re: [PATCH/RFC v9 04/19] mfd: max77693: adjust
 max77693_led_platform_data

On 12/09/2014 09:50 AM, Lee Jones wrote:
> On Wed, 03 Dec 2014, Jacek Anaszewski wrote:
>
>> Add "label" array for Device Tree strings with the name of a LED device
>> and make flash_timeout a two element array, for caching the sub-led
>> related flash timeout. Added is also an array for caching pointers to the
>> sub-nodes representing sub-leds.
>>
>> Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
>> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
>> Cc: Chanwoo Choi <cw00.choi@...sung.com>
>> Cc: Lee Jones <lee.jones@...aro.org>
>> ---
>>   include/linux/mfd/max77693.h |    4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/linux/mfd/max77693.h b/include/linux/mfd/max77693.h
>> index f0b6585..c80ee99 100644
>> --- a/include/linux/mfd/max77693.h
>> +++ b/include/linux/mfd/max77693.h
>> @@ -88,16 +88,18 @@ enum max77693_led_boost_mode {
>>   };
>>
>>   struct max77693_led_platform_data {
>> +	const char *label[2];
>>   	u32 fleds[2];
>>   	u32 iout_torch[2];for_each_available_child_of_node
>>   	u32 iout_flash[2];
>>   	u32 trigger[2];
>>   	u32 trigger_type[2];
>> +	u32 flash_timeout[2];
>>   	u32 num_leds;
>>   	u32 boost_mode;
>> -	u32 flash_timeout;
>>   	u32 boost_vout;
>>   	u32 low_vsys;
>> +	struct device_node *sub_nodes[2];
>
> I haven't seen anyone do this before.  Why can't you use the provided
> OF functions to traverse through your tree?

I use for_each_available_child_of_node when parsing DT node, but I
need to cache the pointer to sub-node to be able to use it later
when it needs to be passed to V4L2 sub-device which is then
asynchronously matched by the phandle to sub-node.

If it is not well seen to cache it in the platform data then
I will find different way to accomplish this.

Best Regards,
Jacek Anaszewski
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