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authorDavid Lechner <dlechner@baylibre.com>2023-10-16 10:43:09 -0500
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2023-11-16 19:10:25 +0000
commit0300fa851f38864495e6cb107d9a24d30dcb5e19 (patch)
treeb68070e3ff836efa0a957ad4c0d4a4db8e94820e /drivers/iio/resolver
parentf9b9ff95be8ce0e8becfd17b416b68d13915733d (diff)
iio: resolver: ad2s1210: add reset gpio support
This adds support for the optional reset gpio to the ad2s1210 resolver driver. If the gpio is present in the device tree, it is toggled during driver probe before the reset of the device initialization. As per the devicetree bindings, it is expected for the gpio to configured as active low. Suggested-by: Michael Hennerich <Michael.Hennerich@analog.com> Signed-off-by: David Lechner <dlechner@baylibre.com> Acked-by: Michael Hennerich <michael.hennerich@analog.com> Link: https://lore.kernel.org/r/20231016154311.38547-1-dlechner@baylibre.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/resolver')
-rw-r--r--drivers/iio/resolver/ad2s1210.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/iio/resolver/ad2s1210.c b/drivers/iio/resolver/ad2s1210.c
index 8646389ec88d..a414eef12e5e 100644
--- a/drivers/iio/resolver/ad2s1210.c
+++ b/drivers/iio/resolver/ad2s1210.c
@@ -1426,6 +1426,7 @@ static int ad2s1210_setup_gpios(struct ad2s1210_state *st)
{
struct device *dev = &st->sdev->dev;
struct gpio_descs *resolution_gpios;
+ struct gpio_desc *reset_gpio;
DECLARE_BITMAP(bitmap, 2);
int ret;
@@ -1481,6 +1482,17 @@ static int ad2s1210_setup_gpios(struct ad2s1210_state *st)
"failed to set resolution gpios\n");
}
+ /* If the optional reset GPIO is present, toggle it to do a hard reset. */
+ reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(reset_gpio))
+ return dev_err_probe(dev, PTR_ERR(reset_gpio),
+ "failed to request reset GPIO\n");
+
+ if (reset_gpio) {
+ udelay(10);
+ gpiod_set_value(reset_gpio, 0);
+ }
+
return 0;
}