Commit a8ddfea0 authored by Sam Povilus's avatar Sam Povilus Committed by Guenter Roeck
Browse files

hwmon: (ads7828) Accept optional parameters from device tree 



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: default avatarSam Povilus <kernel.development@povil.us>
[groeck: Fixed whitespace errors in ads7828.txt]
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent a4811b6c

Documentation/devicetree/bindings/hwmon/ads7828.txt

0 → 100644
+25 −0
Original line number Diff line number Diff line 
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;

  };

drivers/hwmon/ads7828.c

+15 −0
Original line number Diff line number Diff line
@@ -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)

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