linux-kernel - Re: [PATCH 2/8] i2c: i2c-qcom-geni: Signify successful driver probe

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Message-ID: <20190605085527.GE29637@localhost>
Date:   Wed, 5 Jun 2019 10:55:27 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Johan Hovold <johan@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>, balbi@...nel.org,
        wsa+renesas@...g-engineering.com, gregkh@...uxfoundation.org,
        linus.walleij@...aro.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, david.brown@...aro.org,
        alokc@...eaurora.org, kramasub@...eaurora.org,
        linux-i2c@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, andy.gross@...aro.org,
        jlhugo@...il.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/8] i2c: i2c-qcom-geni: Signify successful driver probe

On Wed, Jun 05, 2019 at 09:49:21AM +0100, Lee Jones wrote:
> On Wed, 05 Jun 2019, Johan Hovold wrote:
> 
> > On Wed, Jun 05, 2019 at 09:20:47AM +0100, Lee Jones wrote:
> > > On Wed, 05 Jun 2019, Johan Hovold wrote:
 
> > > > There are plenty of options for debugging already ranging from adding a
> > > > temporary dev_info() to the probe function in question to using dynamic
> > > > debugging to have driver core log every successful probe.
> > > 
> > > This is what I ended up doing.  It was time consuming to parse though
> > > a log of that size when you have no paging or keyboard.
> > 
> > With the right command-line option to enable dynamic debugging you get
> > one line per successful probe, just like you wanted. Or are you now
> > saying that one-line per device is too much after all? ;)
> 
> Which command line option are you pertaining to?

To enable dynamic debugging in driver core you could use something like

	CONFIG_CMDLINE="dyndbg=\"func really_probe =p\""

That gives you two printouts per successful probe, for example:

	bus: 'usb-serial': really_probe: probing driver edgeport_ti_1 with device ttyUSB0
	bus: 'usb-serial': really_probe: bound device ttyUSB0 to driver edgeport_ti_1

Or you can of course just change the corresponding pr_debug to pr_info
while debugging.

Johan