linux-kernel - Re: [PATCH V3 4/5] spi: s3c64xx: Added provision for dedicated cs pin

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Date:	Mon, 8 Apr 2013 19:19:05 +0530
From:	Girish KS <girishks2000@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	spi-devel-general@...ts.sourceforge.net,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Tomasz Figa <t.figa@...sung.com>
Subject: Re: [PATCH V3 4/5] spi: s3c64xx: Added provision for dedicated cs pin

On Mon, Apr 8, 2013 at 5:50 PM, Mark Brown
<broonie@...nsource.wolfsonmicro.com> wrote:
> On Mon, Apr 08, 2013 at 05:15:26PM +0530, Girish KS wrote:
>> On Mon, Apr 8, 2013 at 3:45 PM, Mark Brown
>
>> > Two options here, one is to just assume nobody will use GPIO 0 and the
>> > other is to set the number appopriately during probe so that only probe
>> > needs to worry about the issue.
>>
>> In the second option if the gpio number is set in the probe, then we
>> are overwriting the
>> actual gpio number assigned in the platform data.
>> If I move the cs_gpio from the platform data to controller private
>> data then the dependency
>> on other platforms can be removed, but still the check (true or false)
>> before setting the gpio
>> line will remain. If agreed upon this i can go ahead and post the patch
>
> I think logic in probe should be fine, it just felt really cumbersome
> having this on every single use but doing it once on probe ought to be
> OK.

I will move the populating cs_gpio logic to probe. But the enable_cs
and disable_cs will have the
check before calling the gpio_set_value api (because it takes cs-line
as a parameter),
--
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