linux-kernel - Re: [PATCH v5] serial: support for 16550A serial ports on LP-8x4x

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Date:	Wed, 16 Dec 2015 11:04:57 +0300
From:	Sergei Ianovich <ynvich@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org,
	Alan Cox <gnomes@...rguk.ukuu.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Scott Wood <scottwood@...escale.com>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Paul Burton <paul.burton@...tec.com>,
	Joachim Eastwood <manabian@...il.com>,
	Mans Rullgard <mans@...sr.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Hurley <peter@...leysoftware.com>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>,
	"open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>
Subject: Re: [PATCH v5] serial: support for 16550A serial ports on LP-8x4x

On Tue, 2015-12-15 at 22:51 +0100, Arnd Bergmann wrote:
> On Wednesday 16 December 2015 00:04:45 Sergei Ianovich wrote:
> > index 0000000..5f9a4c1
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/serial/lp8x4x-serial.txt
> > @@ -0,0 +1,35 @@
> > +UART ports on ICP DAS LP-8x4x
> > +
> > +ICP DAS LP-8x4x contains three additional serial ports interfaced
> > via
> > +Analog Devices ADM213EA chips in addition to 3 serial ports on PXA
> > CPU.
> > +
> > +Required properties:
> > +- compatible : should be "icpdas,uart-lp8x4x"
> 
> Compatible strings should not include a 'x' wildcard like this, better
> use
> the specific chip name.
> 
> Also, it sounds like you named them after the board vendor, which
> sounds
> wrong as the vendor part of the compatible string should be the
> whoever
> made that part (analog?)

The chips themselves are standard, they would work with 8250_core if
properly connected. However, they are not connected normally. Al least
some of their config pins are wired to a different address region. So
the driver is board-specific.

'x' wildcards in the name of the board seem important. There are devices
made by the same vendor without 8 or 4 in their name. Those devices
either are not shipped with linux or are base on a x86 platform.

Does this justify the choice of the compatible string?

> > +- reg : should provide 16 byte man IO memory region and 1 byte
> > region for
> > +       termios
> > +
> > +- interrupts : should provide interrupt
> > +
> > +- interrupt-parent : should provide a link to interrupt controller
> > either
> > +                    explicitly or implicitly from a parent node
> 
> interrupt-parent should be an optional property, or you can leave it
> out,
> as this is a standard property that can always be there when there is 
> interrupts.

ok

> > +Examples (from pxa27x-lp8x4x.dts):
> > +
> > +               uart@...0 {
> 
> By convention, the name should be 'serial', not 'uart'.

ok
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