From 06a4a0cf698474ce5a19eb2854edcb6af51b8055 Mon Sep 17 00:00:00 2001 From: Cosmin Tanislav <demonsingur@gmail.com> Date: Mon, 14 Feb 2022 09:38:08 +0200 Subject: [PATCH] iio: ABI: add note about configuring other attributes during buffer capture It might be impossible to configure other attributes (e.g.: events, scale, sampling rate) if they impact the currently active buffer capture session. On ADXL367, writing to register before 0x2E requires the device to be placed in standby mode, otherwise the changes might be effective for only part of a measurement. To ensure this requirement, the configuration attributes of the IIO device try to claim direct mode before switching to standby mode. During a buffer capture, direct mode cannot be claimed, and the attribute write callback returns -EBUSY. Describe this behavior in the buffer/enable attribute description. Signed-off-by: Cosmin Tanislav <cosmin.tanislav@analog.com> Link: https://lore.kernel.org/r/20220214073810.781016-4-cosmin.tanislav@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> --- Documentation/ABI/testing/sysfs-bus-iio | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index 41c1e3e1bf309..bc98453bdade5 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -1278,6 +1278,10 @@ Description: Actually start the buffer capture up. Will start trigger if first device and appropriate. + Note that it might be impossible to configure other attributes, + (e.g.: events, scale, sampling rate) if they impact the currently + active buffer capture session. + What: /sys/bus/iio/devices/iio:deviceX/bufferY KernelVersion: 5.11 Contact: linux-iio@vger.kernel.org -- GitLab