linux-kernel - Re: [PATCH v7 0/6] Add support for the IEI WT61P803 PUZZLE MCU

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Date:   Mon, 2 Nov 2020 23:36:39 +0100
From:   Luka Kovacic <luka.kovacic@...tura.hr>
To:     Dan Murphy <dmurphy@...com>
Cc:     Pavel Machek <pavel@....cz>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-hwmon@...r.kernel.org,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Marek Behun <marek.behun@....cz>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH v7 0/6] Add support for the IEI WT61P803 PUZZLE MCU

Hello,

On Mon, Nov 2, 2020 at 7:30 PM Dan Murphy <dmurphy@...com> wrote:
>
> Hello
>
> On 11/1/20 3:56 AM, Luka Kovacic wrote:
> > Hello Pavel,
> >
> > On Thu, Oct 29, 2020 at 7:01 PM Pavel Machek <pavel@....cz> wrote:
> >> Hi!
> >>
> >>> +What:                /sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/power_status
> >>> +Date:                September 2020
> >>> +Contact:     Luka Kovacic <luka.kovacic@...tura.hr>
> >>> +Description: (RO) Power status indicates the host platform power on method.
> >>> +             Value mapping (bitwise list):
> >>> +             0x80 - Null
> >>> +             0x40 - Firmware flag
> >>> +             0x20 - Power loss detection flag (powered off)
> >>> +             0x10 - Power loss detection flag (AC mode)
> >>> +             0x08 - Button power on
> >>> +             0x04 - WOL power on
> >>> +             0x02 - RTC alarm power on
> >>> +             0x01 - AC recover power on
> >> It would be nice to put this into standard place somewhere. Many
> >> machines will want to expose this information.
> > As this is specific to this microcontroller and to how it encodes
> > these values, I don't see a need to change this.
> > This isn't used anywhere else.
> >
> >> If not, at least spell out WoL, as it is not that common of acronym.
> > Okay.
>
> WoL is a very common acronym especially in the networking space

By WOL I meant Wake-on-LAN, I will spell out the whole acronym.

>
> But the overall this section does not make sense
>
> The description says that it indicates platform power on method but what
> is NULL power on? There are flags for power loss detection.

I will clarify the value mapping and try to replicate some of these states
so I can write a better description.

>
> Does the RTC mean that the processor real time clock woke up the uC? Or
> that the internal RTC woke up the controller?

These are all related to the platform as a whole.
So the Marvell SoC and all of the required peripherals are turned on.

>
> And for the
> /sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/ac_recovery_status
> what are those values?

These values indicate whether the board has been shut down gracefully and
whether it has been powered on automatically (when power came back) or by
pressing the power button.
I will also extend the documentation with the value mapping for this.

>
> It seems like some ABI's are documented well with formats and others are
> just described without a format.
>
> For instance
>
> /sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/version the format
> of this version is not described but
> /sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/build_info is.

I left out the version format descriptions as they are in the recognizable
format and all of them are quite arbitrary (e.g. v1.000).

>
>
> Dan
>

Kind regards,
Luka