linux-kernel - RE: [PATCH v3 3/5] phy: realtek: usb: Add driver for the Realtek SoC USB 3.0 PHY

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Date:   Thu, 8 Jun 2023 07:40:23 +0000
From:   Stanley Chang[昌育德] 
        <stanley_chang@...ltek.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Ray Chi <raychi@...gle.com>,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        Flavio Suligoi <f.suligoi@...m.it>,
        Matthias Kaehlcke <mka@...omium.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH v3 3/5] phy: realtek: usb: Add driver for the Realtek SoC USB 3.0 PHY

> >> Please drop all simple debug success messages. Linux has already
> >> infrastructure for this.
> >>
> > Okay. I will change the print dev_info to dev_dbg about debug message.
> 
> No, drop them. This piece of code had already 2 printks for register contents!
> Your driver is overloaded with printks and they are mostly useless for the user.

I will drop them to simplify the code.

> >> Please drop all simple debug success messages. Linux has already
> >> infrastructure for this.
> >
> > Can I keep log for dev_dbg?
> 
> Of course not. This was dev_dbg and I commented on this. This is not a good
> debug, we do not print anything on function entrance and exit.
> ftrace() is for this.

Well, for debugging purposes, I'm going to have to dig into ftrace.
This is a great tip.
> >>
> >> Are you sure you run checkpatch on this? Error messages on debugfs
> >> are almost always incorrect.
> >
> > Yes, I have run checkpatch for patches.
> > Why the message is incorrect?
> 
> Because debugfs failures should not cause any error prints. It's debug, not
> important.
> 
> Do you see anywhere error messages?
> 
> Entire debugfs handling code should be silent and even skip all error checking,
> as most API is ready for handling previous errors, I think.

Thanks, I understand now.

Thanks,
Stanley