linux-kernel - [PATCH] regulator: core: Request GPIO before creating sysfs entries

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Message-Id: <1456129440-28143-1-git-send-email-krzysztof.adamski@tieto.com>
Date:	Mon, 22 Feb 2016 09:24:00 +0100
From:	Krzysztof Adamski <krzysztof.adamski@...to.com>
To:	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Cc:	Krzysztof Adamski <krzysztof.adamski@...to.com>
Subject: [PATCH] regulator: core: Request GPIO before creating sysfs entries

regulator_attr_is_visible (which is a .is_visible callback of
regulator_dev_group attribute_grpup) checks rdev->ena_pin to decide if
"status" file should be present in sysfs. This field is set at the end
of regulator_ena_gpio_request so it has to be called before
device_register() otherwise this test will always fail, causing "status"
file to not be visible.

Since regulator_attr_is_visible also tests for is_enabled() op, this
problem is only visible for regulators that does not define this
callback, like regulator-fixed.c.

Signed-off-by: Krzysztof Adamski <krzysztof.adamski@...to.com>
---
 drivers/regulator/core.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 4405be1..6ee9ba4 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3913,6 +3913,16 @@ regulator_register(const struct regulator_desc *regulator_desc,
 			goto clean;
 	}
 
+	if ((config->ena_gpio || config->ena_gpio_initialized) &&
+	    gpio_is_valid(config->ena_gpio)) {
+		ret = regulator_ena_gpio_request(rdev, config);
+		if (ret != 0) {
+			rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
+				 config->ena_gpio, ret);
+			goto wash;
+		}
+	}
+
 	/* register with sysfs */
 	rdev->dev.class = &regulator_class;
 	rdev->dev.parent = dev;
@@ -3926,16 +3936,6 @@ regulator_register(const struct regulator_desc *regulator_desc,
 
 	dev_set_drvdata(&rdev->dev, rdev);
 
-	if ((config->ena_gpio || config->ena_gpio_initialized) &&
-	    gpio_is_valid(config->ena_gpio)) {
-		ret = regulator_ena_gpio_request(rdev, config);
-		if (ret != 0) {
-			rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
-				 config->ena_gpio, ret);
-			goto wash;
-		}
-	}
-
 	/* set regulator constraints */
 	if (init_data)
 		constraints = &init_data->constraints;
-- 
2.1.4