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iio: adc: Add battery channel definition for ADC

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Defines a constant for the battery sensing channel, typically the last
channel of the ADC. Clarifies channel usage and improves code
readability.

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 13:46:35 +08:00 committed by Jonathan Cameron
parent e163b09491
commit a28069be7d
1 changed files with 4 additions and 2 deletions
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6
drivers/iio/adc/aspeed_adc.c
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@ -75,6 +75,8 @@
#define ASPEED_ADC_INIT_POLLING_TIME 500
#define ASPEED_ADC_INIT_TIMEOUT 500000
/* Battery sensing is typically on the last channel */
#define ASPEED_ADC_BATTERY_CHANNEL 7
/*
* When the sampling rate is too high, the ADC may not have enough charging
* time, resulting in a low voltage value. Thus, the default uses a slow
@ -285,7 +287,7 @@ static int aspeed_adc_read_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (data->battery_sensing && chan->channel == 7) {
if (data->battery_sensing && chan->channel == ASPEED_ADC_BATTERY_CHANNEL) {
adc_engine_control_reg_val =
readl(data->base + ASPEED_REG_ENGINE_CONTROL);
writel(adc_engine_control_reg_val |
@ -309,7 +311,7 @@ static int aspeed_adc_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT;
case IIO_CHAN_INFO_OFFSET:
if (data->battery_sensing && chan->channel == 7)
if (data->battery_sensing && chan->channel == ASPEED_ADC_BATTERY_CHANNEL)
*val = (data->cv * data->battery_mode_gain.mult) /
data->battery_mode_gain.div;
else