hwmon: (lm70) add device tree support

Allow the lm70 to be probed from a device tree.

Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

2 files changed, 54 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/hwmon/lm70.txt b/Documentation/devicetree/bindings/hwmon/lm70.txt
new file mode 100644
index 000000000000..e7fd921aa4f1
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/lm70.txt
@@ -0,0 +1,21 @@
+* LM70/TMP121/LM71/LM74 thermometer.
+
+Required properties:
+- compatible: one of
+                "ti,lm70"
+                "ti,tmp121"
+                "ti,lm71"
+                "ti,lm74"
+
+See Documentation/devicetree/bindings/spi/spi-bus.txt for more required and
+optional properties.
+
+Example:
+
+spi_master {
+        temperature-sensor@0 {
+                compatible = "ti,lm70";
+                reg = <0>;
+                spi-max-frequency = <1000000>;
+        };
+};
diff --git a/drivers/hwmon/lm70.c b/drivers/hwmon/lm70.c
index 97204dce162d..9296e9daf774 100644
--- a/drivers/hwmon/lm70.c
+++ b/drivers/hwmon/lm70.c
@@ -37,6 +37,7 @@
 #include <linux/mod_devicetable.h>
 #include <linux/spi/spi.h>
 #include <linux/slab.h>
+#include <linux/of_device.h>
 
 
 #define DRVNAME         "lm70"
@@ -130,11 +131,41 @@ ATTRIBUTE_GROUPS(lm70);
 
 /*----------------------------------------------------------------------*/
 
+#ifdef CONFIG_OF
+static const struct of_device_id lm70_of_ids[] = {
+        {
+                .compatible = "ti,lm70",
+                .data = (void *) LM70_CHIP_LM70,
+        },
+        {
+                .compatible = "ti,tmp121",
+                .data = (void *) LM70_CHIP_TMP121,
+        },
+        {
+                .compatible = "ti,lm71",
+                .data = (void *) LM70_CHIP_LM71,
+        },
+        {
+                .compatible = "ti,lm74",
+                .data = (void *) LM70_CHIP_LM74,
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(of, lm70_of_ids);
+#endif
+
 static int lm70_probe(struct spi_device *spi)
 {
-        int chip = spi_get_device_id(spi)->driver_data;
+        const struct of_device_id *match;
         struct device *hwmon_dev;
         struct lm70 *p_lm70;
+        int chip;
+
+        match = of_match_device(lm70_of_ids, &spi->dev);
+        if (match)
+                chip = (int)(uintptr_t)match->data;
+        else
+                chip = spi_get_device_id(spi)->driver_data;
 
         /* signaling is SPI_MODE_0 */
         if (spi->mode & (SPI_CPOL | SPI_CPHA))
@@ -169,6 +200,7 @@ static struct spi_driver lm70_driver = {
         .driver = {
                 .name   = "lm70",
                 .owner  = THIS_MODULE,
+                .of_match_table = of_match_ptr(lm70_of_ids),
         },
         .id_table = lm70_ids,
         .probe  = lm70_probe,