serial: max310x: Make use of device properties

Device property API allows to gather device resources from different sources,
such as ACPI. Convert the drivers to unleash the power of device property API.

Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20201007084635.594991-1-andy.shevchenko@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/max310x.c

@@ -15,8 +15,8 @@
 #include <linux/device.h>
 #include <linux/gpio/driver.h>
 #include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
+#include <linux/mod_devicetable.h>
+#include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/serial_core.h>
 #include <linux/serial.h>
@@ -267,7 +267,7 @@ struct max310x_one {
 	container_of(_port, struct max310x_one, port)
 
 struct max310x_port {
-	struct max310x_devtype	*devtype;
+	const struct max310x_devtype *devtype;
 	struct regmap		*regmap;
 	struct clk		*clk;
 #ifdef CONFIG_GPIOLIB
@@ -1269,7 +1269,7 @@ static int max310x_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
 }
 #endif
 
-static int max310x_probe(struct device *dev, struct max310x_devtype *devtype,
+static int max310x_probe(struct device *dev, const struct max310x_devtype *devtype,
 			 struct regmap *regmap, int irq)
 {
 	int i, ret, fmin, fmax, freq, uartclk;
@@ -1478,7 +1478,7 @@ static struct regmap_config regcfg = {
 #ifdef CONFIG_SPI_MASTER
 static int max310x_spi_probe(struct spi_device *spi)
 {
-	struct max310x_devtype *devtype;
+	const struct max310x_devtype *devtype;
 	struct regmap *regmap;
 	int ret;
 
@@ -1490,18 +1490,9 @@ static int max310x_spi_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	if (spi->dev.of_node) {
-		const struct of_device_id *of_id =
-			of_match_device(max310x_dt_ids, &spi->dev);
-		if (!of_id)
-			return -ENODEV;
-
-		devtype = (struct max310x_devtype *)of_id->data;
-	} else {
-		const struct spi_device_id *id_entry = spi_get_device_id(spi);
-
-		devtype = (struct max310x_devtype *)id_entry->driver_data;
-	}
+	devtype = device_get_match_data(&spi->dev);
+	if (!devtype)
+		devtype = (struct max310x_devtype *)spi_get_device_id(spi)->driver_data;
 
 	regcfg.max_register = devtype->nr * 0x20 - 1;
 	regmap = devm_regmap_init_spi(spi, &regcfg);
@@ -1526,7 +1517,7 @@ MODULE_DEVICE_TABLE(spi, max310x_id_table);
 static struct spi_driver max310x_spi_driver = {
 	.driver = {
 		.name		= MAX310X_NAME,
-		.of_match_table	= of_match_ptr(max310x_dt_ids),
+		.of_match_table	= max310x_dt_ids,
 		.pm		= &max310x_pm_ops,
 	},
 	.probe		= max310x_spi_probe,