diff options
| -rw-r--r-- | Documentation/devicetree/bindings/hwmon/ads7828.txt | 25 | ||||
| -rw-r--r-- | drivers/hwmon/ads7828.c | 15 |
2 files changed, 40 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/hwmon/ads7828.txt b/Documentation/devicetree/bindings/hwmon/ads7828.txt new file mode 100644 index 0000000..fe0cc4a --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/ads7828.txt @@ -0,0 +1,25 @@ +ads7828 properties + +Required properties: +- compatible: Should be one of + ti,ads7828 + ti,ads7830 +- reg: I2C address + +Optional properties: + +- ti,differential-input + Set to use the device in differential mode. +- vref-supply + The external reference on the device is set to this regulators output. If it + does not exists the internal reference will be used and output by the ads78xx + on the "external vref" pin. + + Example ADS7828 node: + + ads7828: ads@48 { + comatible = "ti,ads7828"; + reg = <0x48>; + vref-supply = <&vref>; + ti,differential-input; + }; diff --git a/drivers/hwmon/ads7828.c b/drivers/hwmon/ads7828.c index b0ef666..898607b 100644 --- a/drivers/hwmon/ads7828.c +++ b/drivers/hwmon/ads7828.c @@ -35,6 +35,7 @@ #include <linux/platform_data/ads7828.h> #include <linux/regmap.h> #include <linux/slab.h> +#include <linux/regulator/consumer.h> /* The ADS7828 registers */ #define ADS7828_CMD_SD_SE 0x80 /* Single ended inputs */ @@ -119,10 +120,12 @@ static int ads7828_probe(struct i2c_client *client, struct ads7828_data *data; struct device *hwmon_dev; unsigned int vref_mv = ADS7828_INT_VREF_MV; + unsigned int vref_uv; bool diff_input = false; bool ext_vref = false; unsigned int regval; enum ads7828_chips chip; + struct regulator *reg; data = devm_kzalloc(dev, sizeof(struct ads7828_data), GFP_KERNEL); if (!data) @@ -133,6 +136,18 @@ static int ads7828_probe(struct i2c_client *client, ext_vref = pdata->ext_vref; if (ext_vref && pdata->vref_mv) vref_mv = pdata->vref_mv; + } else if (dev->of_node) { + diff_input = of_property_read_bool(dev->of_node, + "ti,differential-input"); + reg = devm_regulator_get_optional(dev, "vref"); + if (!IS_ERR(reg)) { + vref_uv = regulator_get_voltage(reg); + vref_mv = DIV_ROUND_CLOSEST(vref_uv, 1000); + if (vref_mv < ADS7828_EXT_VREF_MV_MIN || + vref_mv > ADS7828_EXT_VREF_MV_MAX) + return -EINVAL; + ext_vref = true; + } } if (client->dev.of_node) |
