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adc: stm32mp15: add support of generic channels binding

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Add support of generic IIO channels binding:
./devicetree/bindings/iio/adc/adc.yaml
Keep support of st,adc-channels for backward compatibility.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Olivier Moysan 2022-11-23 16:20:16 +01:00 committed by Patrice Chotard
parent 1727d46bf9
commit a9aa2aef5f
1 changed files with 44 additions and 5 deletions
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49
drivers/adc/stm32-adc.c
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@ -200,24 +200,63 @@ static int stm32_adc_legacy_chan_init(struct udevice *dev, unsigned int num_chan
return ret;
}
static int stm32_adc_generic_chan_init(struct udevice *dev, unsigned int num_channels)
{
struct adc_uclass_plat *uc_pdata = dev_get_uclass_plat(dev);
struct stm32_adc *adc = dev_get_priv(dev);
ofnode child;
int val, ret;
ofnode_for_each_subnode(child, dev_ofnode(dev)) {
ret = ofnode_read_u32(child, "reg", &val);
if (ret) {
dev_err(dev, "Missing channel index %d\n", ret);
return ret;
}
if (val >= adc->cfg->max_channels) {
dev_err(dev, "Invalid channel %d\n", val);
return -EINVAL;
}
uc_pdata->channel_mask |= 1 << val;
}
return 0;
}
static int stm32_adc_chan_of_init(struct udevice *dev)
{
struct adc_uclass_plat *uc_pdata = dev_get_uclass_plat(dev);
struct stm32_adc *adc = dev_get_priv(dev);
unsigned int num_channels;
int ret;
bool legacy = false;
ret = stm32_adc_get_legacy_chan_count(dev);
if (ret < 0)
return ret;
num_channels = ret;
num_channels = dev_get_child_count(dev);
/* If no channels have been found, fallback to channels legacy properties. */
if (!num_channels) {
legacy = true;
ret = stm32_adc_get_legacy_chan_count(dev);
if (!ret) {
dev_err(dev, "No channel found\n");
return -ENODATA;
} else if (ret < 0) {
return ret;
}
num_channels = ret;
}
if (num_channels > adc->cfg->max_channels) {
dev_err(dev, "too many st,adc-channels: %d\n", num_channels);
return -EINVAL;
}
ret = stm32_adc_legacy_chan_init(dev, num_channels);
if (legacy)
ret = stm32_adc_legacy_chan_init(dev, num_channels);
else
ret = stm32_adc_generic_chan_init(dev, num_channels);
if (ret < 0)
return ret;