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SubjectRe: [PATCH 2/2] power: supply: max17042_battery: add technology property support
On Mon, Sep 26, 2016 at 02:56:44PM +0200, Wolfgang Wiedmeyer wrote:
>
> Krzysztof Kozlowski writes:
>
> > On Sun, Sep 25, 2016 at 11:10:11PM +0200, Wolfgang Wiedmeyer wrote:
> >> This patch reports the battery technology as Li-ion.
> >>
> >> Signed-off-by: Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de>
> >> ---
> >> drivers/power/max17042_battery.c | 4 ++++
> >> 1 file changed, 4 insertions(+)
> >>
> >> diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c
> >> index 20cb1fd..43cb5df 100644
> >> --- a/drivers/power/max17042_battery.c
> >> +++ b/drivers/power/max17042_battery.c
> >> @@ -92,6 +92,7 @@ static enum power_supply_property max17042_battery_props[] = {
> >> POWER_SUPPLY_PROP_TEMP_MIN,
> >> POWER_SUPPLY_PROP_TEMP_MAX,
> >> POWER_SUPPLY_PROP_HEALTH,
> >> + POWER_SUPPLY_PROP_TECHNOLOGY,
> >> POWER_SUPPLY_PROP_CURRENT_NOW,
> >> POWER_SUPPLY_PROP_CURRENT_AVG,
> >> };
> >> @@ -296,6 +297,9 @@ static int max17042_get_property(struct power_supply *psy,
> >> if (ret < 0)
> >> return ret;
> >> break;
> >> + case POWER_SUPPLY_PROP_TECHNOLOGY:
> >> + val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
> >
> > How can you be sure it is always Li-Ion? For wearables and mobiles, rather yes, but
> > the driver is also used in other devices. Technically, specs are saying
> > it might be used also with Li-Poly applications.
>
> I suppose that there is no way to detect this. Would it be ok if I add
> an optional Device Tree property that allows to specify if it's Li-Ion
> or Li-Poly? If the property is not supplied, then "unknown" is returned.

I am not sure in such case what will be the benefit of exposing this to
user-space... but it won't harm neither and sounds like a valid usage of
DT properties. Fine with me.

Best regards,
Krzysztof

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