linux-kernel - Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support

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Date:	Mon, 28 Dec 2015 09:56:20 +0900
From:	Milo Kim <milo.kim@...com>
To:	Paul Kocialkowski <contact@...lk.fr>
CC:	Mark Brown <broonie@...nel.org>, <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Benoît Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support

Hi Paul,

On 23/12/15 20:56, Mark Brown wrote:
> On Wed, Dec 23, 2015 at 11:58:37AM +0100, Paul Kocialkowski wrote:
>
>> +	gpio = lp->pdata->enable_gpio;
>> +	if (!gpio_is_valid(gpio))
>> +		return 0;
>> +
>> +	/* Always set enable GPIO high. */
>> +	ret = devm_gpio_request_one(lp->dev, gpio, GPIOF_OUT_INIT_HIGH, "LP872X EN");
>> +	if (ret) {
>> +		dev_err(lp->dev, "gpio request err: %d\n", ret);
>> +		return ret;
>> +	}
>
> This isn't really adding support for the enable GPIO as the changelog
> suggests, it's requesting but not managing the GPIO.  Since there is
> core support for manging enable GPIOs this seems especially silly,
> please tell the core about the GPIO and then it will work at runtime
> too.
>

With reference to my previous mail, external GPIOs for LDO3 and BUCK2 in 
LP8725 can be specified through regulator_config.ena_gpio. BUCK2 only 
can be controlled by external pin when CONFIG pin is grounded.

Please see the description at page 5 of the datasheet.

	http://www.ti.com/lit/ds/symlink/lp8725.pdf

Best regards,
Milo
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