linux-kernel - [PATCH 02/12] regulator: gpio-regulator: Only read GPIO [dis|en]able pin if not always-on

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Date:	Mon, 10 Dec 2012 08:55:51 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	arnd@...db.de, linus.walleij@...ricsson.com,
	ulf.hansson@...aro.org, Lee Jones <lee.jones@...aro.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH 02/12] regulator: gpio-regulator: Only read GPIO [dis|en]able pin if not always-on

If a regulator is specified as always-on, then it can't have an
enable/disable pin, as it can't be turned off.

Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/regulator/gpio-regulator.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/gpio-regulator.c b/drivers/regulator/gpio-regulator.c
index 1a71be2..3afa46a 100644
--- a/drivers/regulator/gpio-regulator.c
+++ b/drivers/regulator/gpio-regulator.c
@@ -160,7 +160,14 @@ of_get_gpio_regulator_config(struct device *dev, struct device_node *np)
 
 	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
 
-	config->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
+	if (!config->init_data->constraints.always_on) {
+		config->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
+		if (config->enable_gpio < 0) {
+			dev_err(dev, "Couldn't get 'enable-gpio' (%d)\n",
+				config->enable_gpio);
+			return ERR_PTR(config->enable_gpio);
+		}
+	}
 
 	/* Fetch GPIOs. */
 	for (i = 0; ; i++)
-- 
1.7.9.5

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