linux-kernel - Re: [PATCH 07/19] serdev: Allows dynamic creation of devices via sysfs

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Message-ID: <CAPybu_2n2+2vPnvqB_ZYHC3KpqFUQs0OMM7PgTKTa5wX=27_aQ@mail.gmail.com>
Date:   Tue, 29 May 2018 18:32:25 +0200
From:   Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Wolfram Sang <wsa@...-dreams.de>
Subject: Re: [PATCH 07/19] serdev: Allows dynamic creation of devices via sysfs

Using the right address for Wolfram
On Tue, May 29, 2018 at 6:30 PM Ricardo Ribalda Delgado <
ricardo.ribalda@...il.com> wrote:

> Hi Rob

> On Tue, May 29, 2018 at 5:38 PM Rob Herring <robh@...nel.org> wrote:

> > On Tue, May 29, 2018 at 8:10 AM, Ricardo Ribalda Delgado
> > <ricardo.ribalda@...il.com> wrote:
> > > Allow creating and deleting devices via sysfs. Devices created will be
> > > matched to serdev drivers via modalias (the string provided by the
user)
> > > and deleted via their name. Eg:
> > >
> > >  # Create device
> > > root@...022:~# echo ttydev >
/sys/bus/serial/devices/serial0/new_device
> > >
> > >  # Delete device
> > > root@...022:~#
> > >         echo serial0-0 > /sys/bus/serial/devices/serial0/delete_device

> > I think the model here should be the kernel provides dummy slave
> > device for each serial port and then you can use bind and unbind to
> > bind to a particular driver.


> I have been researching a bit that approach, but I found a couple of
issues:

> - With the bind/unbind you need to modprobe manually the module. Something
> like

> modprobe myserdev
> echo myserdev > bind

> - You need one module per part_number, with modalias you can have a
> different alias per module

> - I guess that the final user will appreciate that the serdev has the same
> API as other serial slow bus (i2c).

> ccing Wolfram becase maybe he has some feedback to same from his
experience
> with the i2c bus.

> Thanks!


> > Rob



> --
> Ricardo Ribalda



-- 
Ricardo Ribalda