mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-04-30 15:50:10 -04:00
Code Issues Packages Projects Releases Wiki Activity

iio: adc: at91-sama5d2_adc: update trackx on emr

Browse Source 
Add support for updating trackx bits of EMR register. Having different
values of EMR.TRACKX when measuring temperature give a better accuracy.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220803102855.2191070-14-claudiu.beznea@microchip.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Claudiu Beznea
2022-08-03 13:28:49 +03:00
committed by Jonathan Cameron
parent 426b64752c
commit 04227f9510
1 changed files with 10 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/iio/adc/at91-sama5d2_adc.c
View File

@@ -145,6 +145,10 @@ struct at91_adc_reg_layout {
#define AT91_SAMA5D2_EMR_OSR_64SAMPLES 3
#define AT91_SAMA5D2_EMR_OSR_256SAMPLES 4
/* Extended Mode Register - TRACKX */
#define AT91_SAMA5D2_TRACKX_MASK GENMASK(23, 22)
#define AT91_SAMA5D2_TRACKX(x) (((x) << 22) & \
AT91_SAMA5D2_TRACKX_MASK)
/* Extended Mode Register - Averaging on single trigger event */
#define AT91_SAMA5D2_EMR_ASTE(V) ((V) << 20)
@@ -746,7 +750,7 @@ static void at91_adc_eoc_ena(struct at91_adc_state *st, unsigned int channel)
}
static int at91_adc_config_emr(struct at91_adc_state *st,
u32 oversampling_ratio)
u32 oversampling_ratio, u32 trackx)
{
/* configure the extended mode register */
unsigned int emr = at91_adc_readl(st, EMR);
@@ -765,7 +769,7 @@ static int at91_adc_config_emr(struct at91_adc_state *st,
emr |= AT91_SAMA5D2_EMR_ASTE(1);
/* delete leftover content if it's the case */
emr &= ~osr_mask;
emr &= ~(osr_mask | AT91_SAMA5D2_TRACKX_MASK);
/* select oversampling ratio from configuration */
switch (oversampling_ratio) {
@@ -791,6 +795,8 @@ static int at91_adc_config_emr(struct at91_adc_state *st,
break;
}
/* Update trackx. */
emr |= AT91_SAMA5D2_TRACKX(trackx);
at91_adc_writel(st, EMR, emr);
st->oversampling_ratio = oversampling_ratio;
@@ -1706,7 +1712,7 @@ static int at91_adc_write_raw(struct iio_dev *indio_dev,
return ret;
mutex_lock(&st->lock);
/* update ratio */
ret = at91_adc_config_emr(st, val);
ret = at91_adc_config_emr(st, val, 0);
mutex_unlock(&st->lock);
iio_device_release_direct_mode(indio_dev);
return ret;
@@ -1904,7 +1910,7 @@ static void at91_adc_hw_init(struct iio_dev *indio_dev)
at91_adc_setup_samp_freq(indio_dev, st->soc_info.min_sample_rate);
/* configure extended mode register */
at91_adc_config_emr(st, st->oversampling_ratio);
at91_adc_config_emr(st, st->oversampling_ratio, 0);
}
static ssize_t at91_adc_get_fifo_state(struct device *dev,