Hi Darrick,

On Fri, 14 Sep 2007 12:29:24 -0700, Darrick J. Wong wrote:
> Update the hwmon sysfs interface documentation to include a specification
> for power meters.

Thanks for the update. I have some more comments. And sorry if it looks
like nitpicking, but this is a standard interface we're defining so we
better make sure that we get it right.

First of all, please think of a better subject line for this patch.
"Update Documentation/hwmon/sysfs-interface" is too vague when your
patch is rather specific.

> Signed-off-by: Darrick J. Wong <[EMAIL PROTECTED]>
> ---
> 
>  Documentation/hwmon/sysfs-interface |   30 ++++++++++++++++++++++++++++++
>  1 files changed, 30 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/hwmon/sysfs-interface 
> b/Documentation/hwmon/sysfs-interface
> index db7bb4a..5c98bee 100644
> --- a/Documentation/hwmon/sysfs-interface
> +++ b/Documentation/hwmon/sysfs-interface
> @@ -324,6 +324,36 @@ curr[1-*]_input  Current input value
>               Unit: milliampere
>               RO
>  
> +*********
> +* Power *
> +*********
> +
> +power[1-*]_average           Average power use
> +                             Unit: microWatt
> +                             RO
> +
> +power[1-*]_average_highest   Historical average maximum power use
> +                             Unit: microWatt
> +                             RO
> +
> +power[1-*]_average_lowest    Historical average minimum power use
> +                             Unit: microWatt
> +                             RO

How useful are historical extremes of an average?

> +
> +power[1-*]_input             Instantaneous power use
> +                             Unit: microWatt
> +                             RO
> +
> +power[1-*]_input_highest     Historical maximum power use
> +                             Unit: microWatt
> +                             RO
> +
> +power[1-*]_input_lowest              Historical minimum power use
> +                             Unit: microWatt
> +                             RO
> +
> +power[1-*]_high_low_reset    Reset input_highest/input_lowest.
> +                             WO

I don't much like this name. It sounds like a name crafted for the
specific feature of a given chip, while we try to use generic names for
the standard interface. I would rather go for power[1-*]_reset_history
if we have a single file for resetting all the extremes of a given
channel, or power[1-*]_input_lowest_reset and
power[1-*]_input_highest_reset if we go for a per-value reset.

Alternatively, we could simply make the power[1-*]_input_lowest and
power[1-*]_input_highest files writable, and "cat power1_input >
power1_input_lowest" (or any write?) would reset the history.

>  
>  **********
>  * Alarms *

Thanks,
-- 
Jean Delvare
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