linux-kernel - Re: [PATCH v4 16/17] FDT: Add a helper to get specified name subnode

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Message-ID: <CAL_JsqJJx_agcQRa=vU25Db33t8LtaoBw+dZB5jS2N7LA2KX2g@mail.gmail.com>
Date:	Wed, 24 Feb 2016 08:53:46 -0600
From:	Rob Herring <robh@...nel.org>
To:	Shannon Zhao <zhaoshenglong@...wei.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Stefano Stabellini <stefano.stabellini@...rix.com>,
	david.vrabel@...rix.com, Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Mark Rutland <mark.rutland@....com>, julien.grall@...rix.com,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Shannon Zhao <shannon.zhao@...aro.org>,
	peter.huangpeng@...wei.com
Subject: Re: [PATCH v4 16/17] FDT: Add a helper to get specified name subnode

On Tue, Feb 23, 2016 at 5:13 AM, Shannon Zhao <zhaoshenglong@...wei.com> wrote:
>
>
> On 2016/2/9 13:04, Rob Herring wrote:
>> On Thu, Feb 4, 2016 at 9:05 PM, Shannon Zhao <zhaoshenglong@...wei.com> wrote:
>>> From: Shannon Zhao <shannon.zhao@...aro.org>
>>>
>>> Sometimes it needs to check if there is a node in FDT by full path.
>>
>> I'm confused. Are you searching by full path or...
>>
>>> Introduce this helper to get the specified name subnode if it exists.
>>
>> name of sub node?
>>
> get the offset of sub node by specified name.
>
>> Either way, fdt_subnode_offset or fdt_path_offset doesn't work?
>>
> Ah，right，both of them should work. Does it need to add a wrapper in
> drivers/of/fdt.c for them or directly use them with the parameter
> initial_boot_params?

Add a wrapper in fdt.c.

Rob