linux-kernel - Re: [PATCH v5 09/12] Driver core: Unified interface for firmware node properties

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Date:	Mon, 20 Oct 2014 06:14:34 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Aaron Lu <aaron.lu@...el.com>, devicetree@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Bryan Wu <cooloney@...il.com>,
	Darren Hart <dvhart@...ux.intel.com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v5 09/12] Driver core: Unified interface for firmware
 node properties

On Fri, Oct 17, 2014 at 02:14:53PM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Add new generic routines are provided for retrieving properties from
> device description objects in the platform firmware in case there are
> no struct device objects for them (either those objects have not been
> created yet or they do not exist at all).
> 
> The following functions are provided:
> 
> fwnode_property_present()
> fwnode_property_read_u8()
> fwnode_property_read_u16()
> fwnode_property_read_u32()
> fwnode_property_read_u64()
> fwnode_property_read_string()
> fwnode_property_read_u8_array()
> fwnode_property_read_u16_array()
> fwnode_property_read_u32_array()
> fwnode_property_read_u64_array()
> fwnode_property_read_string_array()
> 
> in analogy with the corresponding functions for struct device added
> previously.  For all of them, the first argument is a pointer to struct
> fwnode_handle (new type) that allows a device description object
> (depending on what platform firmware interface is in use) to be
> obtained.
> 
> Add a new macro device_for_each_child_node() for iterating over the
> children of the device description object associated with a given
> device and a new function device_get_child_node_count() returning the
> number of a given device's child nodes.
> 
> The interface covers both ACPI and Device Trees.
> 
> Suggested-by: Grant Likely <grant.likely@...aro.org>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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