serial: max310x: Add devicetree support

This patch adds devicetree support for the MAX310X serial driver.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 32 insertions, 9 deletions

diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index e27385438472..8a035d6b2d05 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -19,6 +19,8 @@
 #include <linux/device.h>
 #include <linux/gpio.h>
 #include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/regmap.h>
 #include <linux/serial_core.h>
 #include <linux/serial.h>
@@ -1093,7 +1095,7 @@ static int max310x_gpio_direction_output(struct gpio_chip *chip,
 #endif
 
 static int max310x_probe(struct device *dev, struct max310x_devtype *devtype,
-                         struct regmap *regmap, int irq)
+                         struct regmap *regmap, int irq, unsigned long flags)
 {
         int i, ret, fmin, fmax, freq, uartclk;
         struct clk *clk_osc, *clk_xtal;
@@ -1237,8 +1239,7 @@ static int max310x_probe(struct device *dev, struct max310x_devtype *devtype,
 
         /* Setup interrupt */
         ret = devm_request_threaded_irq(dev, irq, NULL, max310x_ist,
-                                        IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
-                                        dev_name(dev), s);
+                                        IRQF_ONESHOT | flags, dev_name(dev), s);
         if (!ret)
                 return 0;
 
@@ -1284,6 +1285,15 @@ static int max310x_remove(struct device *dev)
         return ret;
 }
 
+static const struct of_device_id __maybe_unused max310x_dt_ids[] = {
+        { .compatible = "maxim,max3107",        .data = &max3107_devtype, },
+        { .compatible = "maxim,max3108",        .data = &max3108_devtype, },
+        { .compatible = "maxim,max3109",        .data = &max3109_devtype, },
+        { .compatible = "maxim,max14830",       .data = &max14830_devtype },
+        { }
+};
+MODULE_DEVICE_TABLE(of, max310x_dt_ids);
+
 static struct regmap_config regcfg = {
         .reg_bits = 8,
         .val_bits = 8,
@@ -1297,8 +1307,8 @@ static struct regmap_config regcfg = {
 #ifdef CONFIG_SPI_MASTER
 static int max310x_spi_probe(struct spi_device *spi)
 {
-        struct max310x_devtype *devtype =
-                (struct max310x_devtype *)spi_get_device_id(spi)->driver_data;
+        struct max310x_devtype *devtype;
+        unsigned long flags = 0;
         struct regmap *regmap;
         int ret;
 
@@ -1310,10 +1320,22 @@ 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);
+
+                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;
+                flags = IRQF_TRIGGER_FALLING;
+        }
+
         regcfg.max_register = devtype->nr * 0x20 - 1;
         regmap = devm_regmap_init_spi(spi, &regcfg);
 
-        return max310x_probe(&spi->dev, devtype, regmap, spi->irq);
+        return max310x_probe(&spi->dev, devtype, regmap, spi->irq, flags);
 }
 
 static int max310x_spi_remove(struct spi_device *spi)
@@ -1332,9 +1354,10 @@ MODULE_DEVICE_TABLE(spi, max310x_id_table);
 
 static struct spi_driver max310x_uart_driver = {
         .driver = {
-                .name   = MAX310X_NAME,
-                .owner  = THIS_MODULE,
-                .pm     = &max310x_pm_ops,
+                .name           = MAX310X_NAME,
+                .owner          = THIS_MODULE,
+                .of_match_table = of_match_ptr(max310x_dt_ids),
+                .pm             = &max310x_pm_ops,
         },
         .probe          = max310x_spi_probe,
         .remove         = max310x_spi_remove,