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Date:   Sun, 24 Mar 2019 15:33:03 +1100
From:   Tom Burkart <tom@...sec.com>
To:     Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Tom Burkart <tom@...sec.com>,
        Rodolfo Giometti <giometti@...eenne.com>
Subject: [PATCH v18 1/3] pps: descriptor-based gpio

This patch changes the GPIO access for the pps-gpio driver from the
integer based API to the descriptor based API.

The integer based API is considered deprecated and the descriptor
based API is the preferred way to access GPIOs as per
Documentation/driver-api/gpio/intro.rst

No changes are made to userspace interfaces.

Acked-by: Rodolfo Giometti <giometti@...eenne.com>
Reviewed-by: Philipp Zabel <philipp.zabel@...il.com>
Signed-off-by: Tom Burkart <tom@...sec.com>
---
 drivers/pps/clients/pps-gpio.c | 67 +++++++++++++++++++-----------------------
 include/linux/pps-gpio.h       |  3 +-
 2 files changed, 32 insertions(+), 38 deletions(-)

diff --git a/drivers/pps/clients/pps-gpio.c b/drivers/pps/clients/pps-gpio.c
index dd5d1103e02b..4e5e9229814b 100644
--- a/drivers/pps/clients/pps-gpio.c
+++ b/drivers/pps/clients/pps-gpio.c
@@ -31,7 +31,7 @@
 #include <linux/slab.h>
 #include <linux/pps_kernel.h>
 #include <linux/pps-gpio.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/list.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
@@ -41,9 +41,9 @@ struct pps_gpio_device_data {
 	int irq;			/* IRQ used as PPS source */
 	struct pps_device *pps;		/* PPS source device */
 	struct pps_source_info info;	/* PPS source information */
+	struct gpio_desc *gpio_pin;	/* GPIO port descriptors */
 	bool assert_falling_edge;
 	bool capture_clear;
-	unsigned int gpio_pin;
 };
 
 /*
@@ -61,18 +61,37 @@ static irqreturn_t pps_gpio_irq_handler(int irq, void *data)
 
 	info = data;
 
-	rising_edge = gpio_get_value(info->gpio_pin);
+	rising_edge = gpiod_get_value(info->gpio_pin);
 	if ((rising_edge && !info->assert_falling_edge) ||
 			(!rising_edge && info->assert_falling_edge))
 		pps_event(info->pps, &ts, PPS_CAPTUREASSERT, NULL);
 	else if (info->capture_clear &&
 			((rising_edge && info->assert_falling_edge) ||
-			 (!rising_edge && !info->assert_falling_edge)))
+			(!rising_edge && !info->assert_falling_edge)))
 		pps_event(info->pps, &ts, PPS_CAPTURECLEAR, NULL);
 
 	return IRQ_HANDLED;
 }
 
+static int pps_gpio_setup(struct platform_device *pdev)
+{
+	struct pps_gpio_device_data *data = platform_get_drvdata(pdev);
+	struct device_node *np = pdev->dev.of_node;
+
+	data->gpio_pin = devm_gpiod_get(&pdev->dev,
+		NULL,	/* request "gpios" */
+		GPIOD_IN);
+	if (IS_ERR(data->gpio_pin)) {
+		dev_err(&pdev->dev,
+			"failed to request PPS GPIO\n");
+		return PTR_ERR(data->gpio_pin);
+	}
+
+	if (of_property_read_bool(np, "assert-falling-edge"))
+		data->assert_falling_edge = true;
+	return 0;
+}
+
 static unsigned long
 get_irqf_trigger_flags(const struct pps_gpio_device_data *data)
 {
@@ -90,53 +109,30 @@ get_irqf_trigger_flags(const struct pps_gpio_device_data *data)
 static int pps_gpio_probe(struct platform_device *pdev)
 {
 	struct pps_gpio_device_data *data;
-	const char *gpio_label;
 	int ret;
 	int pps_default_params;
 	const struct pps_gpio_platform_data *pdata = pdev->dev.platform_data;
-	struct device_node *np = pdev->dev.of_node;
 
 	/* allocate space for device info */
-	data = devm_kzalloc(&pdev->dev, sizeof(struct pps_gpio_device_data),
-			GFP_KERNEL);
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
+	platform_set_drvdata(pdev, data);
 
+	/* GPIO setup */
 	if (pdata) {
 		data->gpio_pin = pdata->gpio_pin;
-		gpio_label = pdata->gpio_label;
 
 		data->assert_falling_edge = pdata->assert_falling_edge;
 		data->capture_clear = pdata->capture_clear;
 	} else {
-		ret = of_get_gpio(np, 0);
-		if (ret < 0) {
-			dev_err(&pdev->dev, "failed to get GPIO from device tree\n");
-			return ret;
-		}
-		data->gpio_pin = ret;
-		gpio_label = PPS_GPIO_NAME;
-
-		if (of_get_property(np, "assert-falling-edge", NULL))
-			data->assert_falling_edge = true;
-	}
-
-	/* GPIO setup */
-	ret = devm_gpio_request(&pdev->dev, data->gpio_pin, gpio_label);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to request GPIO %u\n",
-			data->gpio_pin);
-		return ret;
-	}
-
-	ret = gpio_direction_input(data->gpio_pin);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to set pin direction\n");
-		return -EINVAL;
+		ret = pps_gpio_setup(pdev);
+		if (ret)
+			return -EINVAL;
 	}
 
 	/* IRQ setup */
-	ret = gpio_to_irq(data->gpio_pin);
+	ret = gpiod_to_irq(data->gpio_pin);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to map GPIO to IRQ: %d\n", ret);
 		return -EINVAL;
@@ -173,7 +169,6 @@ static int pps_gpio_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	platform_set_drvdata(pdev, data);
 	dev_info(data->pps->dev, "Registered IRQ %d as PPS source\n",
 		 data->irq);
 
@@ -209,4 +204,4 @@ MODULE_AUTHOR("Ricardo Martins <rasm@...up.pt>");
 MODULE_AUTHOR("James Nuss <jamesnuss@...ometrics.ca>");
 MODULE_DESCRIPTION("Use GPIO pin as PPS source");
 MODULE_LICENSE("GPL");
-MODULE_VERSION("1.0.0");
+MODULE_VERSION("1.1.0");
diff --git a/include/linux/pps-gpio.h b/include/linux/pps-gpio.h
index 56f35dd3d01d..f028d2cda6f5 100644
--- a/include/linux/pps-gpio.h
+++ b/include/linux/pps-gpio.h
@@ -23,10 +23,9 @@
 #define _PPS_GPIO_H
 
 struct pps_gpio_platform_data {
+	struct gpio_desc *gpio_pin;
 	bool assert_falling_edge;
 	bool capture_clear;
-	unsigned int gpio_pin;
-	const char *gpio_label;
 };
 
 #endif /* _PPS_GPIO_H */
-- 
2.12.3

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