linux-kernel - Re: [PATCH] mfd: axp20x: Add supplied-from property to axp288_fuel

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Date:   Thu, 5 Aug 2021 14:11:32 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, C++ / GCC <cpp@....lt>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: axp20x: Add supplied-from property to
 axp288_fuel_gauge cell

On Sat, 17 Jul 2021, Hans de Goede wrote:

> The power-supply framework has the notion of one power-supply device
> being supplied by another. A typical example of this is a charger
> charging a battery.
> 
> A tablet getting plugged in to charge (or plugged out) only results in
> events seen by the axp288_charger device / MFD cell. Which means that
> a change udev-event only gets send for the charger power-supply class
> device, not for the battery (the axp288_fuel_gauge device).
> 
> The axp288_fuel_gauge does have an external_power_change'd callback
> which will generate a change udev-event when called. But before this
> commit this never got called because the power-supply core only calls
> this when a power-supply class device's supplier changes and the
> supplier link from axp288_charger to axp288_fuel_gauge was missing.
> 
> Add a "supplied-from" property to axp288_fuel_gauge cell, pointing
> to the "axp288_charger" power-supply class device, so that the
> axp288_fuel_gauge's external_power_change'd callback gets called on
> axp288_charger state changes.
> 
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
>  drivers/mfd/axp20x.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)

Applied, thanks.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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