From 48fb57697ee620945b6deca3d688b797acd95450 Mon Sep 17 00:00:00 2001
From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Date: Sun, 6 Feb 2022 19:03:27 +0000
Subject: [PATCH] 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
---
drivers/staging/iio/adc/ad7280a.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
index a7e16144b0136..ef9d27759961f 100644
--- a/drivers/staging/iio/adc/ad7280a.c
+++ b/drivers/staging/iio/adc/ad7280a.c
@@ -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;
--
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