linux-kernel - Re: [PATCH v2 6/6] of_spi: Initialize cs_gpios and cs

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Date:	Tue, 12 Feb 2013 10:46:27 +0100
From:	Andreas Larsson <andreas@...sler.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	Rob Herring <rob.herring@...xeda.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	devicetree-discuss@...ts.ozlabs.org,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, software@...sler.com
Subject: Re: [PATCH v2 6/6] of_spi: Initialize cs_gpios and cs_gpio with -EEXIST

On 2013-02-11 01:23, Grant Likely wrote:
> On Tue, 29 Jan 2013 15:53:43 +0100, Andreas Larsson <andreas@...sler.com> wrote:
>> Holes in the cs-gpios DT phandle list is supposed to mark that native
>> chipselects is to be used. The value returned from of_get_named_gpio_flags in
>> this case is -EEXIST. By initializing cs_gpios and cs_gpio with -EEXIST, this
>> and only this errno will indicate to a spi controller driver that a native
>> chipselect is to be used.
>>
>> Signed-off-by: Andreas Larsson <andreas@...sler.com>
>
> I've left this one off for now. Take a look at the patch I posted and
> let me know if you think this one should still be applied.

I think that of_spi_register_master should return an error when the 
cs-gpios property is broken (part of patch 2) and that cs_gpios and 
cs_gpio should be initialized to the same value as a hole in the plist.

This patch does not work without 1 and 2, so I'll submit a modified 
patch once "of: Create function for counting number of phandles in a 
property" has stabilized. Would it have to go through the gpio branch then?

Cheers,
Andreas

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