iio: ssp_sensors: Convert to use GPIO descriptors

These three GPIO lines used by the Samsung sensor hub is pretty
straight-forward to convert to use GPIO descriptors.

Cc: Karol Wrona <k.wrona@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/common/ssp_sensors/ssp.h

@@ -7,7 +7,7 @@
 #define __SSP_SENSORHUB_H__
 
 #include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/iio/common/ssp_sensors.h>
 #include <linux/iio/iio.h>
 #include <linux/spi/spi.h>
@@ -168,9 +168,9 @@ struct ssp_sensorhub_info {
  * @fw_dl_state:	firmware download state
  * @comm_lock:		lock protecting the handshake
  * @pending_lock:	lock protecting pending list and completion
- * @mcu_reset_gpio:	mcu reset line
- * @ap_mcu_gpio:	ap to mcu gpio line
- * @mcu_ap_gpio:	mcu to ap gpio line
+ * @mcu_reset_gpiod:	mcu reset line
+ * @ap_mcu_gpiod:	ap to mcu gpio line
+ * @mcu_ap_gpiod:	mcu to ap gpio line
  * @pending_list:	pending list for messages queued to be sent/read
  * @sensor_devs:	registered IIO devices table
  * @enable_refcount:	enable reference count for wdt (watchdog timer)
@@ -212,9 +212,9 @@ struct ssp_data {
 	struct mutex comm_lock;
 	struct mutex pending_lock;
 
-	int mcu_reset_gpio;
-	int ap_mcu_gpio;
-	int mcu_ap_gpio;
+	struct gpio_desc *mcu_reset_gpiod;
+	struct gpio_desc *ap_mcu_gpiod;
+	struct gpio_desc *mcu_ap_gpiod;
 
 	struct list_head pending_list;
 

drivers/iio/common/ssp_sensors/ssp_dev.c

@@ -9,7 +9,6 @@
 #include <linux/mfd/core.h>
 #include <linux/module.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/of_platform.h>
 #include "ssp.h"
 
@@ -61,9 +60,9 @@ static const struct mfd_cell sensorhub_sensor_devs[] = {
 
 static void ssp_toggle_mcu_reset_gpio(struct ssp_data *data)
 {
-	gpio_set_value(data->mcu_reset_gpio, 0);
+	gpiod_set_value(data->mcu_reset_gpiod, 0);
 	usleep_range(1000, 1200);
-	gpio_set_value(data->mcu_reset_gpio, 1);
+	gpiod_set_value(data->mcu_reset_gpiod, 1);
 	msleep(50);
 }
 
@@ -441,7 +440,6 @@ MODULE_DEVICE_TABLE(of, ssp_of_match);
 
 static struct ssp_data *ssp_parse_dt(struct device *dev)
 {
-	int ret;
 	struct ssp_data *data;
 	struct device_node *node = dev->of_node;
 	const struct of_device_id *match;
@@ -450,26 +448,17 @@ static struct ssp_data *ssp_parse_dt(struct device *dev)
 	if (!data)
 		return NULL;
 
-	data->mcu_ap_gpio = of_get_named_gpio(node, "mcu-ap-gpios", 0);
-	if (data->mcu_ap_gpio < 0)
-		return NULL;
-
-	data->ap_mcu_gpio = of_get_named_gpio(node, "ap-mcu-gpios", 0);
-	if (data->ap_mcu_gpio < 0)
-		return NULL;
-
-	data->mcu_reset_gpio = of_get_named_gpio(node, "mcu-reset-gpios", 0);
-	if (data->mcu_reset_gpio < 0)
+	data->mcu_ap_gpiod = devm_gpiod_get(dev, "mcu-ap", GPIOD_IN);
+	if (IS_ERR(data->mcu_ap_gpiod))
 		return NULL;
 
-	ret = devm_gpio_request_one(dev, data->ap_mcu_gpio, GPIOF_OUT_INIT_HIGH,
-				    "ap-mcu-gpios");
-	if (ret)
+	data->ap_mcu_gpiod = devm_gpiod_get(dev, "ap-mcu", GPIOD_OUT_HIGH);
+	if (IS_ERR(data->ap_mcu_gpiod))
 		return NULL;
 
-	ret = devm_gpio_request_one(dev, data->mcu_reset_gpio,
-				    GPIOF_OUT_INIT_HIGH, "mcu-reset-gpios");
-	if (ret)
+	data->mcu_reset_gpiod = devm_gpiod_get(dev, "mcu-reset",
+					       GPIOD_OUT_HIGH);
+	if (IS_ERR(data->mcu_reset_gpiod))
 		return NULL;
 
 	match = of_match_node(ssp_of_match, node);

drivers/iio/common/ssp_sensors/ssp_spi.c

@@ -155,17 +155,17 @@ static int ssp_check_lines(struct ssp_data *data, bool state)
 {
 	int delay_cnt = 0;
 
-	gpio_set_value_cansleep(data->ap_mcu_gpio, state);
+	gpiod_set_value_cansleep(data->ap_mcu_gpiod, state);
 
-	while (gpio_get_value_cansleep(data->mcu_ap_gpio) != state) {
+	while (gpiod_get_value_cansleep(data->mcu_ap_gpiod) != state) {
 		usleep_range(3000, 3500);
 
 		if (data->shut_down || delay_cnt++ > 500) {
 			dev_err(SSP_DEV, "%s:timeout, hw ack wait fail %d\n",
 				__func__, state);
 
 			if (!state)
-				gpio_set_value_cansleep(data->ap_mcu_gpio, 1);
+				gpiod_set_value_cansleep(data->ap_mcu_gpiod, 1);
 
 			return -ETIMEDOUT;
 		}
@@ -197,7 +197,7 @@ static int ssp_do_transfer(struct ssp_data *data, struct ssp_msg *msg,
 
 	status = spi_write(data->spi, msg->buffer, SSP_HEADER_SIZE);
 	if (status < 0) {
-		gpio_set_value_cansleep(data->ap_mcu_gpio, 1);
+		gpiod_set_value_cansleep(data->ap_mcu_gpiod, 1);
 		dev_err(SSP_DEV, "%s spi_write fail\n", __func__);
 		goto _error_locked;
 	}