github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-31 02:24:24 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

iio: adc: Enable multiple consecutive channels based on model data

Browse Source 
Add helpers to generate channel masks and enable multiple ADC channels
according to the device model's channel count.

Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Billy Tsai 2026-03-20 13:46:36 +08:00 committed by Jonathan Cameron
parent a28069be7d
commit 9ee1c3be16
1 changed files with 21 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/iio/adc/aspeed_adc.c
View File

@ -123,6 +123,24 @@ struct aspeed_adc_data {
struct adc_gain battery_mode_gain;
};
/*
* Enable multiple consecutive channels starting from channel 0.
* This creates a bitmask for channels 0 to (num_channels - 1).
* For example: num_channels=3 creates mask 0x0007 (channels 0,1,2)
*/
static inline u32 aspeed_adc_channels_mask(unsigned int num_channels)
{
if (num_channels > 16)
return GENMASK(15, 0);
return BIT(num_channels) - 1;
}
static inline unsigned int aspeed_adc_get_active_channels(const struct aspeed_adc_data *data)
{
return data->model_data->num_channels;
}
#define ASPEED_CHAN(_idx, _data_reg_addr) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
@ -612,7 +630,9 @@ static int aspeed_adc_probe(struct platform_device *pdev)
/* Start all channels in normal mode. */
adc_engine_control_reg_val =
readl(data->base + ASPEED_REG_ENGINE_CONTROL);
adc_engine_control_reg_val |= ASPEED_ADC_CTRL_CHANNEL;
FIELD_MODIFY(ASPEED_ADC_CTRL_CHANNEL, &adc_engine_control_reg_val,
aspeed_adc_channels_mask(aspeed_adc_get_active_channels(data)));
writel(adc_engine_control_reg_val,
data->base + ASPEED_REG_ENGINE_CONTROL);