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iio: adc: ad7124: Shift to dynamic allocation for channel configuration 

This patch changes the channel configuration member of the device
structure from a fixed size array to a dynamic allocated one with a size
equal to the number of channels specified in the device tree. This will
ensure a more flexibility for compatible devices.

Ex. ad7124-4 - can have 4 differential or 8 pseudo-differential channels
ad7124-8 - can have 8 differential or 16 pseudo-differential channels

Also the device can suspport any other combination of differential and
pseudo-differential channels base on the physical number of inputs
available.

Signed-off-by: Mircea Caprioru <mircea.caprioru@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
alistair/sunxi64-5.4-dsi
Mircea Caprioru 2019-06-25 11:11:26 +03:00 committed by Jonathan Cameron
parent 0eaecea6e4
commit 1478a388f4
1 changed files with 8 additions and 1 deletions
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9
drivers/iio/adc/ad7124.c
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@ -121,7 +121,7 @@ struct ad7124_channel_config {
struct ad7124_state {
const struct ad7124_chip_info *chip_info;
struct ad_sigma_delta sd;
struct ad7124_channel_config channel_config[4];
struct ad7124_channel_config *channel_config;
struct regulator *vref[4];
struct clk *mclk;
unsigned int adc_control;
@ -439,6 +439,7 @@ static int ad7124_of_parse_channel_config(struct iio_dev *indio_dev,
struct ad7124_state *st = iio_priv(indio_dev);
struct device_node *child;
struct iio_chan_spec *chan;
struct ad7124_channel_config *chan_config;
unsigned int ain[2], channel = 0, tmp;
int ret;
@ -453,8 +454,14 @@ static int ad7124_of_parse_channel_config(struct iio_dev *indio_dev,
if (!chan)
return -ENOMEM;
chan_config = devm_kcalloc(indio_dev->dev.parent, st->num_channels,
sizeof(*chan_config), GFP_KERNEL);
if (!chan_config)
return -ENOMEM;
indio_dev->channels = chan;
indio_dev->num_channels = st->num_channels;
st->channel_config = chan_config;
for_each_available_child_of_node(np, child) {
ret = of_property_read_u32(child, "reg", &channel);