linux-kernel - Re: [PATCH v3 2/4] regulator: core: manage enable GPIO list

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Message-ID: <CAFRkauA60-LgBuPmMuW34cHFcBuH8AZpj3VtKyNabMSVdwYoiA@mail.gmail.com>
Date:	Tue, 19 Feb 2013 10:07:10 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	"Kim, Milo" <Milo.Kim@...com>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/4] regulator: core: manage enable GPIO list

> +/**
> + * Balance enable_count of each GPIO and actual GPIO pin control.
> + * GPIO is enabled in case of initial use. (enable_count is 0)
> + * GPIO is disabled when it is not shared any more. (enable_count <= 1)
I think you mean "GPIO is disabled when it is not used any more."
"It is not shared" sounds like it can has one user.

> + */
> +static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
> +{
> +       struct regulator_enable_gpio *pin = rdev->ena_pin;
> +
> +       if (!pin)
> +               return -EINVAL;
> +
> +       if (enable) {
> +               /* Enable GPIO at initial use */
> +               if (pin->enable_count == 0)
> +                       gpio_set_value_cansleep(pin->gpio,
> +                                               !pin->ena_gpio_invert);
> +
> +               pin->enable_count++;
> +       } else {
> +               if (pin->enable_count > 1) {
> +                       pin->enable_count--;
> +                       return 0;
> +               }
> +
> +               /* Disable GPIO if not used */
> +               if (pin->enable_count <= 1) {
> +                       gpio_set_value_cansleep(pin->gpio,
> +                                               pin->ena_gpio_invert);
> +                       pin->enable_count = 0;
> +               }
How about:

/* No action to disable if enable_count is already 0 */
if (pin->enable_count == 0)
        return 0;

/* Disable GPIO if not used */
if (--pin->enable_count == 0)
        gpio_set_value_cansleep(pin->gpio, pin->ena_gpio_invert);
--
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