iio: adc: mcp3422: Add mcp3421 support

The mcp3421 is the single channel variant of the mcp342x family. Support
is straight forward, only the channels array has to be added for this
chip.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/mcp3422.c b/drivers/iio/adc/mcp3422.c
index 3555122..6eca7ae 100644 (file)
--- a/drivers/iio/adc/mcp3422.c
+++ b/drivers/iio/adc/mcp3422.c
@@ -305,6 +305,10 @@ static const struct attribute_group mcp3422_attribute_group = {
        .attrs = mcp3422_attributes,
 };
 
+static const struct iio_chan_spec mcp3421_channels[] = {
+       MCP3422_CHAN(0),
+};
+
 static const struct iio_chan_spec mcp3422_channels[] = {
        MCP3422_CHAN(0),
        MCP3422_CHAN(1),
@@ -352,6 +356,10 @@ static int mcp3422_probe(struct i2c_client *client,
        indio_dev->info = &mcp3422_info;
 
        switch (adc->id) {
+       case 1:
+               indio_dev->channels = mcp3421_channels;
+               indio_dev->num_channels = ARRAY_SIZE(mcp3421_channels);
+               break;
        case 2:
        case 3:
        case 6:
@@ -383,6 +391,7 @@ static int mcp3422_probe(struct i2c_client *client,
 }
 
 static const struct i2c_device_id mcp3422_id[] = {
+       { "mcp3421", 1 },
        { "mcp3422", 2 },
        { "mcp3423", 3 },
        { "mcp3424", 4 },