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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>
hifive-unleashed-5.1
Rabin Vincent 2015-07-19 00:29:14 +02:00 committed by Guenter Roeck
parent aeaa4d9f81
commit a1dc86ebd2
2 changed files with 54 additions and 1 deletions
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21
Documentation/devicetree/bindings/hwmon/lm70.txt 100644
View File

@ -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>;
};
};

34
drivers/hwmon/lm70.c
View File

@ -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,