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hwmon: (ads7828) Accept optional parameters from device tree

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Adding the ability for the ads7828 and ads7830 to use device tree to
get optional parameters instead of using platform devices. This allows
people using custom boards to also use the ads7828 in a non-default manner.

Signed-off-by: Sam Povilus <[email protected]>
[groeck: Fixed whitespace errors in ads7828.txt]
Signed-off-by: Guenter Roeck <[email protected]>
This commit is contained in:
Sam Povilus 2017-03-29 21:46:37 -06:00 • committed by Guenter Roeck
commit a8ddfea095
2 changed files with 40 additions and 0 deletions
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15
drivers/hwmon/ads7828.c
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@ -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)