linux-kernel - Re: [PATCH V1] regulator: da9211: fix unmatched of

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Message-ID: <20150115112139.GS3043@sirena.org.uk>
Date:	Thu, 15 Jan 2015 11:21:39 +0000
From:	Mark Brown <broonie@...nel.org>
To:	James Ban <james.ban.opensource@...semi.com>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	Support Opensource <support.opensource@...semi.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Dajun Chen <david.chen@...semi.com>
Subject: Re: [PATCH V1] regulator: da9211: fix unmatched of_node and add gpio
 control

On Thu, Jan 15, 2015 at 10:29:08AM +0900, James Ban wrote:
> This is a patch for fixing unmatched of_node and adding gpio control.

That sounds like two separate changes to me...

>  Optional properties:
> +- bucka-uses-gpio: BUCKA can be controlled by gpio.
> +- bucka-enable-platform-gpio: platform gpio for control of BUCKA.
> +- bucka-enable-init-state: initial state of gpio for BUCKA

Even for a single GPIO specifiers are usually called -gpios.  It also
seems redundant to have the -uses property, if there is a GPIO specifier
for the enable then we can just assume it's supposed to be used without
the extra property.

> +		bucka-uses-gpio;
> +		bucka-enable-platform-gpio = <&gpio 27 0>;
> +		bucka-enable-init-state = <0>;
> +
> +		buckb-uses-gpio;
> +		buckb-enable-platform-gpio = <&gpio 17 0>;
> +		buckb-enable-init-state = <0>;
> +
>  		regulators {
>  			BUCKA {
>  				regulator-name = "VBUCKA";

Would it not be more natural to have the properties in the node for the
regulator (the recently added of_parse_cb will help with that)?

> +	if (of_get_property(dev->of_node, "bucka-uses-gpio", NULL)) {
> +		gpio = of_get_named_gpio(dev->of_node,
> +					"bucka-enable-platform-gpio", 0);
> +		if (!gpio_is_valid(gpio)) {
> +			dev_err(dev, "invalid gpio: %d\n", gpio);
> +			return ERR_PTR(-EINVAL);
> +		}

This will be broken for deferred probe, it's better to pass through any
errors.

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