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SubjectRe: [PATCH v3 3/7] mfd: Add base driver for Netronix embedded controller
On Tue, Sep 29, 2020 at 07:37:21PM +0300, Andy Shevchenko wrote:
> On Sat, Sep 26, 2020 at 12:32 AM Jonathan Neuschäfer
> <j.neuschaefer@gmx.net> wrote:
> > On Fri, Sep 25, 2020 at 12:29:45PM +0300, Andy Shevchenko wrote:
> > > On Thu, Sep 24, 2020 at 10:26 PM Jonathan Neuschäfer
> > > <j.neuschaefer@gmx.net> wrote:
>
> ...
>
> > > > + dev_alert(&poweroff_restart_client->dev,
> > > > + "Failed to power off (err = %d)\n", res);
> > >
> > > alert? This needs to be explained.
> >
> > I copied the dev_alert from drivers/mfd/rn5t618.c.
> >
> > Upon reconsideration, I'm not sure what the correct log level would be,
> > but _warn seems enough, or maybe _err is better
>
> It's up to you to decide, but crit/alert and similar has to be
> justified (commit message / comment in the code).

Alright, thanks for explaining.

> > > > + /*
> > > > + * NOTE: The lower half of the reset value is not sent, because sending
> > > > + * it causes an error
> > >
> > > Why? Any root cause? Perhaps you need to send 0xffff ?
> >
> > Unknown, because I don't have the EC firmware for analysis. The vendor
> > kernel sends 0xff00 and gets an error.
> >
> > Sending 0xffff doesn't help.
>
> Maybe a slightly elaborated comment that it's copied from the vendor
> kernel (which is?).

Good idea, I'll do that.

> ...
>
> > > > + dev_info(ec->dev,
> > > > + "Netronix embedded controller version %04x detected.\n",
> > > > + version);
> > >
> > > This info level may confuse users if followed by an error path.
> >
> > Right. I suppose printing incompatible versions is still useful, so how
> > about something like the following?
> >
> >
> > /* Bail out if we encounter an unknown firmware version */
> > switch (version) {
> > case 0xd726: /* found in Kobo Aura */
> > dev_info(ec->dev,
> > "Netronix embedded controller version %04x detected.\n",
> > version);
> > break;
> > default:
> > dev_err(ec->dev,
> > "Netronix embedded controller version %04x is not supported.\n",
> > version);
> > return -ENODEV;
> > }
>
> This is better.
>
> ...
>
> > > > + WARN_ON(poweroff_restart_client);
> > >
> > > WARN_ON? All these alerts, WARNs, BUGs must be explained. Screaming to
> > > the user is not good if it wasn't justified.
> >
> > poweroff_restart_client being already set is not a situation that should
> > happen (and would indicate a bug in this driver, AFAICT), but I guess
> > the log message could be better in that case...
>
> As per above.

Okay, I'll rework the dev_alert/WARN_ON parts.



Thanks,
Jonathan Neuschäfer
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