linux-kernel - Re: [PATCH v2 6/7] counter: ftm-quaddec: Documentation: Add specific counter sysfs documentation

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Date:   Thu, 7 Mar 2019 20:42:16 +0900
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     Patrick Havelange <patrick.havelange@...ensium.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Thierry Reding <thierry.reding@...il.com>,
        Esben Haabendal <esben@...bendal.dk>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pwm@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH v2 6/7] counter: ftm-quaddec: Documentation: Add specific
 counter sysfs documentation

On Wed, Mar 06, 2019 at 12:12:07PM +0100, Patrick Havelange wrote:
> This adds documentation for the specific prescaler entry.
> 
> Signed-off-by: Patrick Havelange <patrick.havelange@...ensium.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@...r.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@...r.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.

William Breathitt Gray