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

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Date:	Tue, 12 Feb 2013 10:18:10 +0100
From:	Andreas Larsson <andreas@...sler.com>
To:	Grant Likely <grant.likely@...retlab.ca>
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 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.

Cheers,
Andreas Larsson

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