From 0300fa851f38864495e6cb107d9a24d30dcb5e19 Mon Sep 17 00:00:00 2001 From: David Lechner Date: Mon, 16 Oct 2023 10:43:09 -0500 Subject: 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 Signed-off-by: David Lechner Acked-by: Michael Hennerich Link: https://lore.kernel.org/r/20231016154311.38547-1-dlechner@baylibre.com Signed-off-by: Jonathan Cameron --- drivers/iio/resolver/ad2s1210.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers/iio/resolver') 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; } -- cgit v1.2.3-58-ga151