diff mbox series

[4/6] iio: dac: ad5791: Add reset, clr and ldac gpios

Message ID 20241029073857.753782-5-ahaslam@baylibre.com (mailing list archive)
State Superseded
Headers show
Series Improvements and Enhancements for AD5791 DAC Driver | expand

Commit Message

Axel Haslam Oct. 29, 2024, 7:38 a.m. UTC 
From: Axel Haslam <ahaslam@baylibre.com>

The ad7591 has reset, clr and ldac gpios. For the DAC to output data
continuously written to the data register the state of these gpios needs
to be set by the driver.

Add these gpios to the driver making them optional in case they are fixed
on the pcb.

Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
---
 drivers/iio/dac/ad5791.c | 34 +++++++++++++++++++++++++++++++---
 1 file changed, 31 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/iio/dac/ad5791.c b/drivers/iio/dac/ad5791.c
index f6b9a40241f3..c5d4d755d57a 100644
--- a/drivers/iio/dac/ad5791.c
+++ b/drivers/iio/dac/ad5791.c
@@ -9,6 +9,7 @@ 
 #include <linux/interrupt.h>
 #include <linux/fs.h>
 #include <linux/device.h>
+#include <linux/delay.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
 #include <linux/slab.h>
@@ -76,6 +77,9 @@  struct ad5791_chip_info {
  * @spi:			spi_device
  * @reg_vdd:		positive supply regulator
  * @reg_vss:		negative supply regulator
+ * @gpio_reset:		reset gpio
+ * @gpio_clear:		clear gpio
+ * @gpio_ldac:		load dac gpio
  * @chip_info:		chip model specific constants
  * @vref_mv:		actual reference voltage used
  * @vref_neg_mv:	voltage of the negative supply
@@ -88,6 +92,9 @@  struct ad5791_state {
 	struct spi_device		*spi;
 	struct regulator		*reg_vdd;
 	struct regulator		*reg_vss;
+	struct gpio_desc		*gpio_reset;
+	struct gpio_desc		*gpio_clear;
+	struct gpio_desc		*gpio_ldac;
 	const struct ad5791_chip_info	*chip_info;
 	unsigned short			vref_mv;
 	unsigned int			vref_neg_mv;
@@ -337,6 +344,22 @@  static int ad5791_probe(struct spi_device *spi)
 	if (!indio_dev)
 		return -ENOMEM;
 	st = iio_priv(indio_dev);
+
+	st->gpio_reset = devm_gpiod_get_optional(&spi->dev, "reset",
+						 GPIOD_OUT_HIGH);
+	if (IS_ERR(st->gpio_reset))
+		return PTR_ERR(st->gpio_reset);
+
+	st->gpio_clear = devm_gpiod_get_optional(&spi->dev, "clear",
+						 GPIOD_OUT_LOW);
+	if (IS_ERR(st->gpio_clear))
+		return PTR_ERR(st->gpio_clear);
+
+	st->gpio_ldac = devm_gpiod_get_optional(&spi->dev, "ldac",
+						GPIOD_OUT_HIGH);
+	if (IS_ERR(st->gpio_ldac))
+		return PTR_ERR(st->gpio_ldac);
+
 	st->reg_vdd = devm_regulator_get(&spi->dev, "vdd");
 	if (!IS_ERR(st->reg_vdd)) {
 		ret = regulator_enable(st->reg_vdd);
@@ -382,9 +405,14 @@  static int ad5791_probe(struct spi_device *spi)
 		dev_warn(&spi->dev, "reference voltage unspecified\n");
 	}
 
-	ret = ad5791_spi_write(st, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET);
-	if (ret)
-		goto error_disable_reg_neg;
+	if (st->gpio_reset) {
+		fsleep(20);
+		gpiod_set_value_cansleep(st->gpio_reset, 0);
+	} else {
+		ret = ad5791_spi_write(st, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET);
+		if (ret)
+			goto error_disable_reg_neg;
+	}
 
 	st->chip_info = spi_get_device_match_data(spi);
 	if (!st->chip_info)