linux-kernel - Re: [PATCH 3/6] dt-bindings: serdev: ngsm: Add binding for GNSS child node

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Date:   Wed, 24 Mar 2021 02:09:27 +0100
From:   Pavel Machek <pavel@....cz>
To:     Johan Hovold <johan@...nel.org>
Cc:     Rob Herring <robh@...nel.org>, Tony Lindgren <tony@...mide.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.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: [PATCH 3/6] dt-bindings: serdev: ngsm: Add binding for GNSS
 child node


On Fri 2021-03-05 11:52:38, Johan Hovold wrote:
> On Fri, Mar 05, 2021 at 11:46:35AM +0100, Pavel Machek wrote:
> > Hi!
> > 
> > > > > For motorola modem case, we may have a GNSS device on channel 4.
> > > > > Let's add that to the binding and example.
> > > > > 
> > > > > Signed-off-by: Tony Lindgren <tony@...mide.com>
> > > > > ---
> > > > >  .../devicetree/bindings/serdev/serdev-ngsm.yaml          | 9 +++++++++
> > > > >  1 file changed, 9 insertions(+)
> > 
> > > 
> > > And since we're describing a mux, I think you need nodes for the virtual
> > > ports rather than a reg property in what should be a serial client. That
> > > is something like
> > > 
> > > 	serial@nnn {
> > > 		modem {
> > > 			compatible = "etsi,ts27001-mux";
> > > 
> > > 			serial@4 {
> > > 				compatible = "etsi,ts27001-serial";
> > > 				reg = <4>;
> > > 
> > > 				gnss {
> > > 					compatible = "motorola,motmdm-gnss";
> > > 				};
> > > 			};
> > > 		};
> > > 	};
> > > 
> > > This way you can actually use serdev for the client drivers (e.g. for
> > > gnss), and those drivers also be used for non-muxed ports if needed
> > > (e.g. over USB).
> > 
> > I have done changes you requested, and then hit "serdev is busy
> > because it can have at most one child" limit in the code. You have
> > pretty clean driver in your inbox, and no reply. No help with serdev
> > core limitations, either. Can you start to communicate?
> 
> It's on my list, but time is limited.

Everyone's time is limited. Do you have any time estimates?
								Pavel

-- 
http://www.livejournal.com/~pavelmachek

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