netdev - Re: [PATCH v3 06/11] dt-bindings: net/can: Add serial (serdev) LIN adapter

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Message-ID: <a5b894f8dc2ab0cf087a5b4972d7f752e6c17c16.camel@hexdev.de>
Date: Fri, 03 May 2024 20:29:15 +0200
From: Christoph Fritz <christoph.fritz@...dev.de>
To: Conor Dooley <conor@...nel.org>
Cc: Jiri Slaby <jirislaby@...nel.org>, Oliver Hartkopp
 <socketcan@...tkopp.net>,  Marc Kleine-Budde <mkl@...gutronix.de>, Vincent
 Mailhol <mailhol.vincent@...adoo.fr>, "David S . Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
 <kuba@...nel.org>,  Paolo Abeni <pabeni@...hat.com>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,  Conor Dooley
 <conor+dt@...nel.org>, Jiri Kosina <jikos@...nel.org>, Benjamin Tissoires
 <bentiss@...nel.org>,  Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Sebastian Reichel <sre@...nel.org>, Linus Walleij
 <linus.walleij@...aro.org>, Andreas Lauser
 <andreas.lauser@...cedes-benz.com>,  Jonathan Corbet <corbet@....net>,
 Pavel Pisa <pisa@....felk.cvut.cz>, linux-can@...r.kernel.org, 
 netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-input@...r.kernel.org,  linux-serial@...r.kernel.org
Subject: Re: [PATCH v3 06/11] dt-bindings: net/can: Add serial (serdev) LIN
 adapter

Hello Conor,

 thanks for having an eye on this, please see my answer below.

On Fri, 2024-05-03 at 18:12 +0100, Conor Dooley wrote:
> On Thu, May 02, 2024 at 08:27:59PM +0200, Christoph Fritz wrote:
> > Add dt-bindings for serial LIN bus adapters. These adapters are
> > basically just LIN transceivers that are hard-wired to serial devices.
> > 
> > Signed-off-by: Christoph Fritz <christoph.fritz@...dev.de>
> > ---
> >  .../bindings/net/can/hexdev,lin-serdev.yaml   | 32 +++++++++++++++++++
> >  1 file changed, 32 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/net/can/hexdev,lin-serdev.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/net/can/hexdev,lin-serdev.yaml b/Documentation/devicetree/bindings/net/can/hexdev,lin-serdev.yaml
> > new file mode 100644
> > index 0000000000000..c178eb9be1391
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/can/hexdev,lin-serdev.yaml
> > @@ -0,0 +1,32 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/can/hexdev,lin-serdev.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Serial LIN Adapter
> > +
> > +description:
> > +  LIN transceiver, mostly hard-wired to a serial device, used for communication
> > +  on a LIN bus.
> > +  For more details on an adapter, visit <https://hexdev.de/hexlin#tty>.
> > +
> > +maintainers:
> > +  - Christoph Fritz <christoph.fritz@...dev.de>
> > +
> > +properties:
> > +  compatible:
> > +    const: hexdev,lin-serdev
> 
> Maybe I've just missed something on earlier versions that I didn't
> read, but the name of the device on the website you link is "hexLIN",
> so why is "lin-serdev" used here instead?

The USB one is called hexLIN and has it's own HID driver.

This serial LIN adapter doesn't really have a product name. Currently
on our website it's generically called 'UART LIN Adapter'.

This LIN adapter is basically just a LIN transceiver and very generic,
so that one could solder it to any single-board computer with an uart.

I think 'lin-serdev' for LIN and serial device fits great, also serdev
is the name of the used kernel infrastructure (besides the LIN glue
driver).

If you still don't like it, I'm open to other names. What about
"hexlin-uart" or "linser"?

Thanks
  -- Christoph
>