linux-kernel - Re: [PATCH v1] regulator: gpio: check return value of of_get_named

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Date:	Sat, 12 Mar 2016 13:23:35 +0700
From:	Mark Brown <broonie@...nel.org>
To:	Mihai Mihalache <mihai.d.mihalache@...el.com>
Cc:	linux-kernel@...r.kernel.org, lgirdwood@...il.com,
	hans.holmberg@...el.com, yousaf.kaukab@...el.com
Subject: Re: [PATCH v1] regulator: gpio: check return value of
 of_get_named_gpio

On Thu, Mar 10, 2016 at 02:04:59AM -0800, Mihai Mihalache wrote:

>  	config->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
> +	if (IS_ERR_VALUE(config->enable_gpio))
> +		return ERR_PTR(config->enable_gpio);

This is an incompatible behaviour change.  enable-gpio is an optional
property, we check later if we got a valid GPIO and happily continue if
we didn't.  The driver should instead explicitly check for -EPROBE_DEFER
and handle that case separately, allowing the device to probe in cases
where the GPIO is just not provided.

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