linux-kernel - Re: [PATCH v2 0/2] pinctrl: Intel Cherryview/Braswell support

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Message-ID: <54595590.7080603@codeaurora.org>
Date:	Tue, 04 Nov 2014 16:39:12 -0600
From:	Timur Tabi <timur@...eaurora.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Ning Li <ning.li@...el.com>, Alan Cox <alan@...ux.intel.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/2] pinctrl: Intel Cherryview/Braswell support

On 11/04/2014 04:32 PM, Timur Tabi wrote:
>
> There are lots of situations where you don't know the size of the
> property in advance (e.g. strings), and drivers use of_find_property()
> or of_get_property() to pre-allocate a buffer or to verify that the
> property is correctly formed in the device tree.

To follow-up, I have this problem right now with pinctrl_dt_to_map(). 
The pinctrl-%d property in the device tree is an array of phandles.  The 
array can be any size, and pinctrl_dt_to_map() queries the size of the 
property to determine how many phandles there are.  It iterates over all 
of them.  How do I support that with device_property_read_u32_array()? 
That function expects to be told how many phandles there are, and it 
doesn't even tell me if there are more or fewer than the number I've given.

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
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