linux-kernel - Re: [PATCHv2 10/12] power: supply: generic-adc-battery: add temperature support

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Message-ID: <20230315130803.aold4bo7x27x3hza@mercury.elektranox.org>
Date:   Wed, 15 Mar 2023 14:08:03 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCHv2 10/12] power: supply: generic-adc-battery: add
 temperature support

Hi Linus,

On Wed, Mar 15, 2023 at 09:04:15AM +0100, Linus Walleij wrote:
> On Tue, Mar 14, 2023 at 11:55 PM Sebastian Reichel <sre@...nel.org> wrote:
> > From: Sebastian Reichel <sebastian.reichel@...labora.com>
> > Another typical thing to monitor via an ADC line is
> > the battery temperature.
> >
> > Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> 
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> 
> >  static bool gab_charge_finished(struct gab *adc_bat)
> > @@ -115,6 +118,8 @@ static int gab_get_property(struct power_supply *psy,
> >                 return read_channel(adc_bat, GAB_CURRENT, &val->intval);
> >         case POWER_SUPPLY_PROP_POWER_NOW:
> >                 return read_channel(adc_bat, GAB_POWER, &val->intval);
> > +       case POWER_SUPPLY_PROP_TEMP:
> > +               return read_channel(adc_bat, GAB_TEMP, &val->intval);
> 
> Hm. I wonder if these should rather all use read_channel_processed()?
> 
> The difference is that you will then support ADCs with internal scaling
> which is beneficial. Most of the time it doesn't matter.

read_channel is a local helper, the driver uses the processed
variant of iio_read_channel:

static int read_channel(struct gab *adc_bat, enum gab_chan_type channel,
                int *result)
{
        int ret;

        ret = iio_read_channel_processed(adc_bat->channel[channel], result);
        if (ret < 0)
                pr_err("read channel error\n");
        else
                *result *= 1000;

        return ret;
}  

-- Sebastian

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