This is a note to let you know that I've just added the patch titled
iio: adc: ti-ads1015: add 10% to conversion wait time
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iio-adc-ti-ads1015-add-10-to-conversion-wait-time.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Dec 6 17:39:55 CET 2017
From: Ladislav Michl <ladis@xxxxxxxxxxxxxx>
Date: Fri, 25 Aug 2017 07:39:16 +0200
Subject: iio: adc: ti-ads1015: add 10% to conversion wait time
From: Ladislav Michl <ladis@xxxxxxxxxxxxxx>
[ Upstream commit fe895ac88b9fbdf2026f0bfd56c82747bb9d7c48 ]
As user's guide "ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, ADS1115EVM-PDK
User Guide (Rev. B)" (http://www.ti.com/lit/ug/sbau157b/sbau157b.pdf)
states at page 16:
"Note that both the ADS1115 and ADS1015 have internal clocks with a ±10%
accuracy. If performing FFT tests, frequencies may appear to be incorrect
as a result of this tolerance range.", add those 10% to converion wait
time.
Cc: Daniel Baluta <daniel.baluta@xxxxxxxxx>
Cc: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Ladislav Michl <ladis@xxxxxxxxxxxxxx>
Reviewed-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/adc/ti-ads1015.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/iio/adc/ti-ads1015.c
+++ b/drivers/iio/adc/ti-ads1015.c
@@ -269,6 +269,7 @@ int ads1015_get_adc_result(struct ads101
conv_time = DIV_ROUND_UP(USEC_PER_SEC, data->data_rate[dr_old]);
conv_time += DIV_ROUND_UP(USEC_PER_SEC, data->data_rate[dr]);
+ conv_time += conv_time / 10; /* 10% internal clock inaccuracy */
usleep_range(conv_time, conv_time + 1);
data->conv_invalid = false;
}
Patches currently in stable-queue which might be from ladis@xxxxxxxxxxxxxx are
queue-4.9/iio-adc-ti-ads1015-add-10-to-conversion-wait-time.patch