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staging:iio:adc:ad7280a: Use more conservative delays to allow 105C operation. 

The datasheet provides timings for operating this device at up to 105
degrees centigrade. Adopt these more conservative timings.

Suggested-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Link: https://lore.kernel.org/r/20220206190328.333093-20-jic23@kernel.org
This commit is contained in:
Jonathan Cameron 2022-02-06 19:03:27 +00:00
parent 6c6bc851d8
commit 48fb57697e
1 changed files with 2 additions and 2 deletions
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4
drivers/staging/iio/adc/ad7280a.c
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@ -137,7 +137,7 @@
#define AD7280A_DEVADDR_ALL 0x1F
static const unsigned short ad7280a_n_avg[4] = {1, 2, 4, 8};
static const unsigned short ad7280a_t_acq_ns[4] = {465, 1010, 1460, 1890};
static const unsigned short ad7280a_t_acq_ns[4] = {470, 1030, 1510, 1945};
/* 5-bit device address is sent LSB first */
static unsigned int ad7280a_devaddr(unsigned int addr)
@ -869,7 +869,7 @@ static void ad7280_update_delay(struct ad7280_state *st)
*/
st->readback_delay_us =
((ad7280a_t_acq_ns[st->acquisition_time & 0x3] + 695) *
((ad7280a_t_acq_ns[st->acquisition_time & 0x3] + 720) *
(AD7280A_NUM_CH * ad7280a_n_avg[st->oversampling_ratio & 0x3])) -
ad7280a_t_acq_ns[st->acquisition_time & 0x3] + st->slave_num * 250;