linux-kernel - Re: [PATCH v3 4/6] power: supply: lenovo_yoga_c630

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Message-ID: <CAA8EJpoYq-MKyMkWfWFSjJq6=3ZRC02k=4oQaqtcp73hQTZZEw@mail.gmail.com>
Date: Tue, 28 May 2024 12:04:50 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Oliver Neukum <oneukum@...e.com>
Cc: Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Bjorn Andersson <andersson@...nel.org>, Hans de Goede <hdegoede@...hat.com>, 
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	"Bryan O'Donoghue" <bryan.odonoghue@...aro.org>, 
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	linux-pm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org, 
	linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	Nikita Travkin <nikita@...n.ru>
Subject: Re: [PATCH v3 4/6] power: supply: lenovo_yoga_c630_battery: add
 Lenovo C630 driver

On Tue, 28 May 2024 at 11:43, Oliver Neukum <oneukum@...e.com> wrote:
>
> On 28.05.24 01:15, Dmitry Baryshkov wrote:
> > On Mon, May 27, 2024 at 02:26:36PM +0200, Oliver Neukum wrote:
> >> On 27.05.24 12:03, Dmitry Baryshkov wrote:
>
> Hi,
>
> >>> +struct yoga_c630_psy {
> >>> +   struct yoga_c630_ec *ec;
> >>> +   struct device *dev;
> >>> +   struct device_node *of_node;
> >>> +   struct notifier_block nb;
> >>> +   struct mutex lock;
> >>> +
> >>> +   struct power_supply *adp_psy;
> >>> +   struct power_supply *bat_psy;
> >>> +
> >>> +   unsigned long last_status_update;
> >>> +
> >>> +   bool adapter_online;
> >>> +
> >>> +   bool unit_mA;
> >>> +
> >>> +   unsigned int scale;
> >>
> >> why do you store unit_mA and scale? This looks redundant and like a source
> >> of confusion to me.
> >
> > Here we just followed the AML code in ACPI tables. The unit_mA is a
> > returned from the_BIX method, the 'scale' is used internally in the DSDT.
> > If you think that it's better, I can change all '* scale * 1000' to
> > 'if unit_mA then foo = bar * 10000 else foo = bar * 1000'.
>
> I think that would indeed be better. Implementation details of the DSDT
> should not dictate data structures in a kernel driver.

Ack.

>
>         Regards
>                 Oliver
>


-- 
With best wishes
Dmitry