From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Boyd <sboyd@codeaurora.org>
Subject: Re: [PATCH 2/2] hwrng: msm: Add PRNG support for MSM SoC's
Date: Fri, 04 Oct 2013 09:37:25 -0700
Message-ID: <524EEEC5.7090803@codeaurora.org>
References: <1380811955-18085-1-git-send-email-svarbanov@mm-sol.com> <1380811955-18085-3-git-send-email-svarbanov@mm-sol.com> <524DC4B1.4050100@codeaurora.org> <524EED4E.8090505@mm-sol.com>
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To: Stanimir Varbanov <svarbanov@mm-sol.com>
Cc: Rob Herring <rob.herring@calxeda.com>, Pawel Moll <pawel.moll@arm.com>, Mark Rutland <mark.rutland@arm.com>, Stephen Warren <swarren@wwwdotorg.org>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Matt Mackall <mpm@selenic.com>, Herbert Xu <herbert@gondor.apana.org.au>, linux-kernel@vger.kernel.org, Rob Landley <rob@landley.net>, devicetree@vger.kernel.org, linux-doc@vger.kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, linux-arm-msm@vger.kernel.org
List-Id: devicetree@vger.kernel.org

On 10/04/13 09:31, Stanimir Varbanov wrote:
>
>>> +static int msm_rng_probe(struct platform_device *pdev)
>>> +{
>>> +	struct msm_rng *rng;
>>> +	struct device_node *np;
>>> +	struct resource res;
>>> +	int ret;
>>> +
>>> +	np = of_node_get(pdev->dev.of_node);
>>> +	if (!np)
>>> +		return -ENODEV;
>> This is unnecessary.
> I used this call because CONFIG_OF_DYNAMIC could be enabled at some
> time. Isn't that possible? I saw that of_node_get|put is used in .probe
> on few places in drivers.

So far we aren't selecting that config on ARM.

If you look at of_device_alloc() you'll see

    dev->dev.of_node = of_node_get(np);

so any platform devices created from of_platform_populate won't have
their of_node go away.

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