On Thu, 7 Mar 2019 20:42:16 +0900
William Breathitt Gray [off-list ref] wrote:

On Wed, Mar 06, 2019 at 12:12:07PM +0100, Patrick Havelange wrote:

quoted

This adds documentation for the specific prescaler entry.

Signed-off-by: Patrick Havelange <patrick.havelange@essensium.com>
---
Changes v2
 - Add doc for prescaler entry
---
 .../ABI/testing/sysfs-bus-counter-ftm-quaddec    | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-counter-ftm-quaddec

diff --git a/Documentation/ABI/testing/sysfs-bus-counter-ftm-quaddec b/Documentation/ABI/testing/sysfs-bus-counter-ftm-quaddec
new file mode 100644
index 000000000000..2da629d6d485
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-counter-ftm-quaddec

@@ -0,0 +1,16 @@
+What:		/sys/bus/counter/devices/counterX/countY/prescaler_available
+KernelVersion:	5.1
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Discrete set of available values for the respective Count Y
+		configuration are listed in this file. Values are delimited by
+		newline characters.
+
+What:		/sys/bus/counter/devices/counterX/countY/prescaler
+KernelVersion:	5.1
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Configure the prescaler value associated with Count Y.
+		On the FlexTimer, the counter clock source passes through a
+		prescaler that is a 7-bit counter. This acts like a clock
+		divider.

-- 
2.19.1  

Hmm, prescalers seem common enough among counter devices to permit these
attributes to be listed in the sysfs-bus-counter documentation file.
However, I'd like to wait until we get another counter driver for a
device with a prescaler before we make that move. From there, we'll have
a better vantage point to determine a fitting standard prescaler
attribute behavior.

So for now, we'll keep these attributes documented here in the
sysfs-bus-counter-ftm-quaddec file, until the time comes to broach the
discussion again.

Agreed. As long as the definition is sufficiently non-specific so it can be
moved later.  I'm not sure for example that the docs need to say that it is
a 7 bit counter. That should be apparent from prescaler_available - or at
least possible values should be which is all we need to know.

Jonathan

William Breathitt Gray