linux-kernel - Re: [PATCH v4 1/9] drivers/of: Introduce of_node

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Date:	Mon, 28 Sep 2015 15:50:38 -0700
From:	Frank Rowand <frowand.list@...il.com>
To:	Marc Zyngier <marc.zyngier@....com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Rutland <mark.rutland@....com>,
	Rob Herring <robh+dt@...nel.org>, linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Graeme Gregory <graeme@...a.org.uk>,
	Jake Oshins <jakeo@...rosoft.com>
Subject: Re: [PATCH v4 1/9] drivers/of: Introduce of_node_alloc

On 9/28/2015 9:42 AM, Marc Zyngier wrote:
> We want to be able to generate "fake" device nodes that can be
> used as an identifier for irq domains. For that, we reuse the
> dynamic DT layer in order to generate DT nodes in a detached state
> (so that it doesn't interfere with the rest of the tree).
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> ---
>  drivers/of/dynamic.c | 22 ++++++++++++++++++++++
>  include/linux/of.h   |  5 +++++
>  2 files changed, 27 insertions(+)
> 
> diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
> index 53826b8..709d363 100644
> --- a/drivers/of/dynamic.c
> +++ b/drivers/of/dynamic.c
> @@ -445,6 +445,28 @@ struct device_node *__of_node_dup(const struct device_node *np, const char *fmt,
>  	return NULL;
>  }
>  
> +/**
> + * of_node_alloc() - Allocate an empty device node dynamically.
> + * @fmt: Format string (plus vargs) for new full name of the device node
> + *
> + * Create an device tree node, either by by allocating an empty one

      Create a device tree node by allocating an empty one

> + * suitable for further modification.  The node data are dynamically
> + * allocated and all the node flags have the OF_DYNAMIC & OF_DETACHED
> + * bits set. Returns the newly allocated node or NULL on out of memory
> + * error.
> + */
> +struct device_node *of_node_alloc(const char *fmt, ...)

< snip >

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