From 6431975789fc3c480cb6344256f72d85889df3b2 Mon Sep 17 00:00:00 2001 From: Michael Hennerich Date: Fri, 27 Jul 2018 09:41:09 +0300 Subject: [PATCH] iio: ad9523: support for external signals via gpios The AD9523 supports external signals for power-down mode, resetting the device and sync timing. This change add support for specifying values for these signals via the gpios and initializing them default values. For the reset signal, the GPIO is toggled during probing to re-initialize the device to a known state. Signed-off-by: Michael Hennerich Signed-off-by: Lars-Peter Clausen Signed-off-by: Alexandru Ardelean Signed-off-by: Jonathan Cameron --- drivers/iio/frequency/ad9523.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/iio/frequency/ad9523.c b/drivers/iio/frequency/ad9523.c index 3750473..38a8f73 100644 --- a/drivers/iio/frequency/ad9523.c +++ b/drivers/iio/frequency/ad9523.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -268,6 +269,9 @@ struct ad9523_state { struct regulator *reg; struct ad9523_platform_data *pdata; struct iio_chan_spec ad9523_channels[AD9523_NUM_CHAN]; + struct gpio_desc *pwrdown_gpio; + struct gpio_desc *reset_gpio; + struct gpio_desc *sync_gpio; unsigned long vcxo_freq; unsigned long vco_freq; @@ -988,6 +992,32 @@ static int ad9523_probe(struct spi_device *spi) return ret; } + st->pwrdown_gpio = devm_gpiod_get_optional(&spi->dev, "powerdown", + GPIOD_OUT_HIGH); + if (IS_ERR(st->pwrdown_gpio)) { + ret = PTR_ERR(st->pwrdown_gpio); + goto error_disable_reg; + } + + st->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(st->reset_gpio)) { + ret = PTR_ERR(st->reset_gpio); + goto error_disable_reg; + } + + if (st->reset_gpio) { + udelay(1); + gpiod_direction_output(st->reset_gpio, 1); + } + + st->sync_gpio = devm_gpiod_get_optional(&spi->dev, "sync", + GPIOD_OUT_HIGH); + if (IS_ERR(st->sync_gpio)) { + ret = PTR_ERR(st->sync_gpio); + goto error_disable_reg; + } + spi_set_drvdata(spi, indio_dev); st->spi = spi; st->pdata = pdata; -- 2.7.4