linux-kernel - Re: [PATCH] of: Create function for counting number of phandles in a property

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Date:	Tue, 12 Feb 2013 17:28:07 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Andreas Larsson <andreas@...sler.com>
Cc:	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH] of: Create function for counting number of phandles in a property

On Tue, 12 Feb 2013 10:18:10 +0100, Andreas Larsson <andreas@...sler.com> wrote:
> On 2013-02-11 00:58, Grant Likely wrote:
> > This patch creates of_count_phandle_with_args(), a new function for
> > counting the number of phandle+argument tuples in a given property. This
> > is better than the existing method of parsing each phandle individually
> > until parsing fails which is a horribly slow way to do the count.
> >
> > It also converts of_gpio_named_count() to use the new function instead
> > of using the above described horrible method.
> >
> > This also requires the return value of of_gpio_count() &
> > of_gpio_named_count() from 'unsigned int' to 'int' so that it can return
> > an error code. All the users of that function are fixed up to correctly
> > handle a negative return value.
> 
> One more thing: In of_spi_register_master() in drivers/spi.c the error 
> code is put in the unsigned variable nb, leading to a huge nb and 
> master->num_chipselect with following problems when of_gpio_named_count 
> returns an error code.

Also a good catch. Fixed.

g.

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