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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2017-06-10 21:58:41 +0300
committerJonathan Cameron <jic23@kernel.org>2017-06-11 16:05:53 +0100
commited3edc0909a84d80b3db3eca9c76a95e29ccae07 (patch)
treef2654167d598c221e21cf3f42069967a993824bf /drivers/iio
parent9eba381bf83b42b312cbae8050e357138782ba9a (diff)
downloadlinux-ed3edc0909a84d80b3db3eca9c76a95e29ccae07.tar.bz2
iio: accel: mma9551: use NULL for GPIO connection ID
While using GPIO library API we might get into troubles in the future, because we can't rely on label name in the driver since vendor firmware might provide any GPIO pin there, e.g. "reset", and even mark it in _DSD (in which case the request will fail). To avoid inconsistency and potential issues we have two options: a) generate GPIO ACPI mapping table and supply it via acpi_dev_add_driver_gpios(), or b) just pass NULL as connection ID. The b) approach is much simpler and would work since the driver relies on GPIO indices only. Moreover, the _CRS fallback mechanism, when requesting GPIO, is going to be stricter, and supplying non-NULL connection ID when neither _DSD, nor GPIO ACPI mapping is present, will make request fail. See https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git/commit/?h=for-next&id=ed7fcf1ed5ea4ea01243995ae085757a77cf0f3e for more background. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/accel/mma9551.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/iio/accel/mma9551.c b/drivers/iio/accel/mma9551.c
index bf2704435629..1f53f08476f5 100644
--- a/drivers/iio/accel/mma9551.c
+++ b/drivers/iio/accel/mma9551.c
@@ -27,7 +27,6 @@
#define MMA9551_DRV_NAME "mma9551"
#define MMA9551_IRQ_NAME "mma9551_event"
-#define MMA9551_GPIO_NAME "mma9551_int"
#define MMA9551_GPIO_COUNT 4
/* Tilt application (inclination in IIO terms). */
@@ -418,8 +417,7 @@ static int mma9551_gpio_probe(struct iio_dev *indio_dev)
struct device *dev = &data->client->dev;
for (i = 0; i < MMA9551_GPIO_COUNT; i++) {
- gpio = devm_gpiod_get_index(dev, MMA9551_GPIO_NAME, i,
- GPIOD_IN);
+ gpio = devm_gpiod_get_index(dev, NULL, i, GPIOD_IN);
if (IS_ERR(gpio)) {
dev_err(dev, "acpi gpio get index failed\n");
return PTR_ERR(gpio);