7a6c69f2be
Introduce the internal clock signal, used to count when in simple rising
function. Also add the "frequency" extension to the clock signal.
With this patch, signal action reports a consistent state when "increase"
function is used, and the counting frequency:
$ echo increase > function
$ grep -H "" signal*_action
signal0_action:none
signal1_action:none
signal2_action:rising edge
$ echo 1 > enable
$ cat count
25425
$ cat count
44439
$ cat ../signal2/frequency
208877930
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20240307133306.383045-5-fabrice.gasnier@foss.st.com
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>