linux-kernel - Re: [PATCH 4/8] docs: counter: add unit timer sysfs attributes

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Date:   Wed, 27 Oct 2021 10:30:36 -0500
From:   David Lechner <david@...hnology.com>
To:     William Breathitt Gray <vilhelm.gray@...il.com>
Cc:     linux-iio@...r.kernel.org, Robert Nelson <robertcnelson@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/8] docs: counter: add unit timer sysfs attributes

On 10/27/21 1:46 AM, William Breathitt Gray wrote:
> On Sat, Oct 16, 2021 at 08:33:39PM -0500, David Lechner wrote:
>> This documents new unit timer sysfs attributes for the counter
>> subsystem.
>>
>> Signed-off-by: David Lechner <david@...hnology.com>
> 
> Hello David,
> 
> The unit timer is effectively a Count in its own right, so instead of
> introducing new sysfs attributes you can just implement it as another
> Count in the driver. Count 0 is "QPOSCNT", so set the name of this new
> Count 1 as "Unit Timer" (or the datasheet naming if more apt) to
> differentiate the Counts. You can then provide the "unit_timer_enable",
> "unit_timer_period", and "unit_timer_time" functionalities as respective
> Count 1 extensions ("enable" and "period") and Count 1 "count".
> 
> If you believe it appropriate, you can provide the raw timer ticks via
> the Count 1 "count" while a nanoseconds interface is provided via a
> Count 1 extension "timeout" (or something similar).
> 

Sounds reasonable.