linux-kernel - Re: [PATCH 13/28] dt-bindings: serial: move Marvell compatible string to 8250 binding doc

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Message-ID: <20200317190913.GA24359@furthur.local>
Date:   Tue, 17 Mar 2020 20:09:13 +0100
From:   Lubomir Rintel <lkundrak@...sk>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Brown <broonie@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-media@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-rtc@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 13/28] dt-bindings: serial: move Marvell compatible
 string to 8250 binding doc

On Tue, Mar 17, 2020 at 02:48:05PM +0100, Andrew Lunn wrote:
> On Tue, Mar 17, 2020 at 10:39:07AM +0100, Lubomir Rintel wrote:
> > These ports are compatible with NS8250 and handled by the same driver.
> > Get rid of the extra document that fails to document the properties that
> > are actually supported.
> 
> Hi Lubmir
> 
> This is needs a bit closer examination. By the PXA maintainers. It
> appears there are two serial drivers, the 8250 and a PXA specific
> driver.

Well, for "mrvl,mmp-uart", there are three: SERIAL_OF_PLATFORM,
SERIAL_8250_PXA and SERIAL_PXA:

  drivers/tty/serial/8250/8250_of.c:      { .compatible = "mrvl,mmp-uart",
  drivers/tty/serial/8250/8250_pxa.c:     { .compatible = "mrvl,mmp-uart", },
  drivers/tty/serial/pxa.c:       { .compatible = "mrvl,mmp-uart", },

For that matter, the hardware is also compatible with intel,xscale-uart
and the mrvl,mmp-uart compatible string is perhaps entirely unnecessary.

I guess the story is somewhat similar for mrvl,pxa-uart; I can not
verify though.

I suppose SERIAL_PXA is not really needed at this point and if support
for mrvl,pxa-uart was added to SERIAL_OF_PLATFORM, then SERIAL_8250_PXA
would only be useful for platforms that don't use DT and the DT bits
could be stripped from it eventually. That is -- if PXA maintainers
agree, of course.

> 	Andrew

Regards
Lubo