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    SubjectRe: [PATCH v2] hwmon: Update Documentation/hwmon/sysfs-interface
    On Mon, Sep 17, 2007 at 07:28:08PM +0200, Jean Delvare wrote:
    > 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.

    Agreed. :)
    > 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.

    Will change to:
    "Add power meter spec to Documentation/hwmon/sysfs-interface"

    > > +power[1-*]_average_lowest Historical average minimum power use
    > > + Unit: microWatt
    > > + RO
    > How useful are historical extremes of an average?

    I don't know if anybody ever really requires this data, but the device
    I'm talking to records the extremes in hardware, so I put it in the driver.

    > > +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

    Guilty as charged. Since ibmpex is the only on-board power meter hardware
    to which I have access, the interface proposal includes the various odd
    pieces that the hardware provides in addition to the meters. I
    could take the historical extreme and reset bits out of the proposal and
    put them in something like Documentation/hwmon/ibmpex.txt as extra
    chip-specific features if people prefer that.

    > the standard interface. I would rather go for power[1-*]_reset_history

    Me too.

    > 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.

    The ibmpex hardware only knows how to reset all of them.

    > 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.

    I'd prefer to leave it explicitly called out as a separate sysfs knob,
    unless there are established precedents for resetting a sensor by
    writing something to its sysfs file.

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