[PATCH 08/15 v4] gpio: Enable nonexclusive gpiods from DT nodes

From: Linus Walleij <linus.walleij@linaro.org>
To: Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>
Cc: linux-kernel@vger.kernel.org,
	Charles Keepax <ckeepax@opensource.cirrus.com>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Linus Walleij <linus.walleij@linaro.org>
Subject: [PATCH 08/15 v4] gpio: Enable nonexclusive gpiods from DT nodes
Date: Thu,  6 Dec 2018 13:43:44 +0100	[thread overview]
Message-ID: <20181206124351.10155-9-linus.walleij@linaro.org> (raw)
In-Reply-To: <20181206124351.10155-1-linus.walleij@linaro.org>

This makes gpiod_get_from_of_node() respect the
GPIOD_FLAGS_BIT_NONEXCLUSIVE flag which is especially
nice when getting regulator GPIOs right out of device
tree nodes.

Cc: Mark Brown <broonie@kernel.org>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Suggested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Fixes: b0ce7b29bfcd ("regulator/gpio: Allow nonexclusive GPIO access")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v3->v4:
- Resending.
ChangeLog v1->v3:
- New patch after Marek's review.
---
 drivers/gpio/gpiolib.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 230e41562462..a7e3fd512e2d 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4204,6 +4204,8 @@ struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
 	transitory = flags & OF_GPIO_TRANSITORY;
 
 	ret = gpiod_request(desc, label);
+	if (ret == -EBUSY && (flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE))
+		return desc;
 	if (ret)
 		return ERR_PTR(ret);
 
-- 
2.19.2

