linux-kernel - Re: [PATCHv6 0/4] n_gsm serdev support and protocol driver for droid4 modem

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Message-ID: <20200426232520.GP37466@atomide.com>
Date:   Sun, 26 Apr 2020 16:25:20 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Pavel Machek <pavel@....cz>
Cc:     Pavel Machek <pavel@...x.de>, Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh@...nel.org>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Lee Jones <lee.jones@...aro.org>, Jiri Slaby <jslaby@...e.cz>,
        Merlijn Wajer <merlijn@...zup.org>,
        Peter Hurley <peter@...leysoftware.com>,
        Sebastian Reichel <sre@...nel.org>,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCHv6 0/4] n_gsm serdev support and protocol driver for
 droid4 modem

* Pavel Machek <pavel@....cz> [200426 20:08]:
> Hi!
> 
> > > > > Here's v4 set of n_gsm serdev support patches, and the related protocol
> > > > > driver for the modem found on Motorola Mapphone phones and tablets
> > > > > like droid4.
> > > > > 
> > > > > This series only adds basic character device support for the serdev
> > > > > driver. Other serdev consumer drivers for specific devices will be
> > > > > posted separately.
> > > > 
> > > > I'm still missing an architectural (design) overview here -- reviewer
> > > > time is a scarce resource.
> > > > 
> > > > I also suggested earlier that you include, at least as an RFC, one or
> > > > more of your child-device drivers so that we can see how this ends up
> > > > being used in the end (including an example devicetree).
> > > 
> > > Note that this is useful on its own: we have ofonod running on the top
> > > of this doing calls and SMSes.
> > 
> > Yup.
> > 
> > > Tony: I know you have drivers depending on this somewhere (audio
> > > routing and GPS), but I can't find them. It is not droid4-pending-v5.6
> > > AFAICT. Do you have a pointer / could you publish them somewhere?
> > 
> > Hmm they should be there in droid4-pending-v5.6 branch [0]:
> > 
> > $ git log --abbrev=12 --pretty=format:"%h (\"%s\")" \
> > 	v5.6..droid4-pending-v5.6 | grep -i -e gsm -e mot -e mdm
> > e09590a260a4 ("mfd: motmdm: Fix oops on unload of motorola-mdm")
> > f9252f9ff6bd ("mfd: motmdm: Revert bad list change")
> > d733dcaf4416 ("mfd: motmdm: Fix issue with receiving data before ddata is set")
> > 452d2b5d4c95 ("n_gsm: Build fixes for make randconfig build")
> > 6882b27ea92a ("phy: mapphone-mdm6600: Fix write timeouts with shorter GPIO toggle interval")
> > 58ff58c4b520 ("mfd: motmdm: Add basic DTMF support")
> > e92b6f30e5ae ("ASoC: audio-graph-card: Add audio mixer for motorold mdm6600")
> > c2caea5767d5 ("gnss: mot-mdm6600: Add support for Motorola Mapphone MDM6600 modem")
> > a5f73b7b06f6 ("mfd: motmdm: Add Motorola TS 27.010 serdev driver for devices like droid4")
> > 6c311d5aeb0a ("dt-bindings: mfd: motmdm: Add binding for motorola-mdm")
> > cd02274b920e ("tty: n_gsm: Add support for serdev drivers")
> > a73a48321c98 ("phy: mapphone-mdm6600: Fix timeouts by adding wake-up handling")
> 
> Here's better try at getting gnss to work on top of linux-next... but
> still no luck.

Hmm that's about all it should take. Presumably you already tried
diffing the related files against droid4-pending-v5.6 branch.

I'm moving around things to work with a generic serdev-ngsm.c driver
so I'm inbetween patches right now and don't have it working either
probably for a few more days.

Regards,

Tony