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iio: accel: adxl380: Store sampling frequency index in odr struct member

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The ADXL380 driver assumes that acceleration samples are always retrieved
via the high-performance DSM signal path; as a result, the sampling
frequency value depends exclusively on the decimation filter settings in
the TRIG_CFG register.
In preparation for adding support for sampling frequency values that rely
on the low-power SAR signal path (on which the decimation filters are not
supported), use the (currently unused) 'odr' member of struct adxl380_state
to store the sampling frequency value, and when userspace requests the
current frequency value, retrieve it from the struct instead of calculating
it from the decimation filter settings.

Signed-off-by: Francesco Lavra <flavra@baylibre.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Francesco Lavra 2026-01-15 18:53:48 +01:00 committed by Jonathan Cameron
parent bac5e3d20c
commit a99b000f92
1 changed files with 2 additions and 11 deletions
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13
drivers/iio/accel/adxl380.c
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@ -417,17 +417,7 @@ static int adxl380_read_chn(struct adxl380_state *st, u8 addr)
static int adxl380_get_odr(struct adxl380_state *st, int *odr)
{
int ret;
unsigned int trig_cfg, odr_idx;
ret = regmap_read(st->regmap, ADXL380_TRIG_CFG_REG, &trig_cfg);
if (ret)
return ret;
odr_idx = (FIELD_GET(ADXL380_TRIG_CFG_SINC_RATE_MSK, trig_cfg) << 1) |
(FIELD_GET(ADXL380_TRIG_CFG_DEC_2X_MSK, trig_cfg) & 1);
*odr = st->chip_info->samp_freq_tbl[odr_idx];
*odr = st->chip_info->samp_freq_tbl[st->odr];
return 0;
}
@ -500,6 +490,7 @@ static int adxl380_set_odr(struct adxl380_state *st, u8 odr)
if (ret)
return ret;
st->odr = odr;
ret = adxl380_set_measure_en(st, true);
if (ret)
return ret;