pps: clients: gpio: Use struct device pointer directly

In most parts of the code the platform device is not used.
Use struct device pointer directly to reduce code size and
increase readability.

Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210318130321.24227-6-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/pps/clients/pps-gpio.c

@@ -99,45 +99,39 @@ static void pps_gpio_echo_timer_callback(struct timer_list *t)
 	gpiod_set_value(info->echo_pin, 0);
 }
 
-static int pps_gpio_setup(struct platform_device *pdev)
+static int pps_gpio_setup(struct device *dev)
 {
-	struct pps_gpio_device_data *data = platform_get_drvdata(pdev);
+	struct pps_gpio_device_data *data = dev_get_drvdata(dev);
 	int ret;
 	u32 value;
 
-	data->gpio_pin = devm_gpiod_get(&pdev->dev,
-		NULL,	/* request "gpios" */
-		GPIOD_IN);
+	data->gpio_pin = devm_gpiod_get(dev, NULL, GPIOD_IN);
 	if (IS_ERR(data->gpio_pin))
-		return dev_err_probe(&pdev->dev, PTR_ERR(data->gpio_pin),
+		return dev_err_probe(dev, PTR_ERR(data->gpio_pin),
 				     "failed to request PPS GPIO\n");
 
-	data->echo_pin = devm_gpiod_get_optional(&pdev->dev,
-			"echo",
-			GPIOD_OUT_LOW);
+	data->echo_pin = devm_gpiod_get_optional(dev, "echo", GPIOD_OUT_LOW);
 	if (IS_ERR(data->echo_pin))
-		return dev_err_probe(&pdev->dev, PTR_ERR(data->echo_pin),
+		return dev_err_probe(dev, PTR_ERR(data->echo_pin),
 				     "failed to request ECHO GPIO\n");
 
 	if (data->echo_pin) {
-		ret = device_property_read_u32(&pdev->dev, "echo-active-ms", &value);
+		ret = device_property_read_u32(dev, "echo-active-ms", &value);
 		if (ret) {
-			dev_err(&pdev->dev,
-				"failed to get echo-active-ms from FW\n");
+			dev_err(dev, "failed to get echo-active-ms from FW\n");
 			return ret;
 		}
 		data->echo_active_ms = value;
 		/* sanity check on echo_active_ms */
 		if (!data->echo_active_ms || data->echo_active_ms > 999) {
-			dev_err(&pdev->dev,
-				"echo-active-ms: %u - bad value from FW\n",
+			dev_err(dev, "echo-active-ms: %u - bad value from FW\n",
 				data->echo_active_ms);
 			return -EINVAL;
 		}
 	}
 
 	data->assert_falling_edge =
-		device_property_read_bool(&pdev->dev, "assert-falling-edge");
+		device_property_read_bool(dev, "assert-falling-edge");
 	return 0;
 }
 
@@ -158,24 +152,26 @@ 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;
+	struct device *dev = &pdev->dev;
 	int ret;
 	int pps_default_params;
 
 	/* allocate space for device info */
-	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
-	platform_set_drvdata(pdev, data);
+
+	dev_set_drvdata(dev, data);
 
 	/* GPIO setup */
-	ret = pps_gpio_setup(pdev);
+	ret = pps_gpio_setup(dev);
 	if (ret)
 		return -EINVAL;
 
 	/* IRQ setup */
 	ret = gpiod_to_irq(data->gpio_pin);
 	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to map GPIO to IRQ: %d\n", ret);
+		dev_err(dev, "failed to map GPIO to IRQ: %d\n", ret);
 		return -EINVAL;
 	}
 	data->irq = ret;
@@ -201,17 +197,17 @@ static int pps_gpio_probe(struct platform_device *pdev)
 		pps_default_params |= PPS_CAPTURECLEAR | PPS_OFFSETCLEAR;
 	data->pps = pps_register_source(&data->info, pps_default_params);
 	if (IS_ERR(data->pps)) {
-		dev_err(&pdev->dev, "failed to register IRQ %d as PPS source\n",
+		dev_err(dev, "failed to register IRQ %d as PPS source\n",
 			data->irq);
 		return PTR_ERR(data->pps);
 	}
 
 	/* register IRQ interrupt handler */
-	ret = devm_request_irq(&pdev->dev, data->irq, pps_gpio_irq_handler,
+	ret = devm_request_irq(dev, data->irq, pps_gpio_irq_handler,
 			get_irqf_trigger_flags(data), data->info.name, data);
 	if (ret) {
 		pps_unregister_source(data->pps);
-		dev_err(&pdev->dev, "failed to acquire IRQ %d\n", data->irq);
+		dev_err(dev, "failed to acquire IRQ %d\n", data->irq);
 		return -EINVAL;
 	}