linux-kernel - Re: [PATCH v6] serial: rewrite pxa2xx-uart to use 8250

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Message-ID: <20151229110643.GB19870@kuha.fi.intel.com>
Date:	Tue, 29 Dec 2015 13:06:43 +0200
From:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:	Sergei Ianovich <ynvich@...il.com>
Cc:	linux-kernel@...r.kernel.org, James Cameron <quozl@...top.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Russell King <linux@....linux.org.uk>,
	Jiri Slaby <jslaby@...e.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>,
	Joachim Eastwood <manabian@...il.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Scott Wood <scottwood@...escale.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Paul Burton <paul.burton@...tec.com>,
	Mans Rullgard <mans@...sr.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Peter Hurley <peter@...leysoftware.com>,
	"open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>
Subject: Re: [PATCH v6] serial: rewrite pxa2xx-uart to use 8250_core

On Thu, Dec 24, 2015 at 06:15:14PM +0300, Sergei Ianovich wrote:
> pxa2xx-uart was a separate uart platform driver. It was declaring
> the same device names and numbers as 8250 driver. As a result,
> it was impossible to use 8250 driver on PXA SoCs.
> 
> Upon closer examination pxa2xx-uart turned out to be a clone of
> 8250_core driver.
> 
> Workaround for Erratum #19 according to Marvel(R) PXA270M Processor
> Specification Update (April 19, 2010) is dropped. 8250_core reads
> from FIFO immediately after checking DR bit in LSR.
> 
> The patch leaves the original SERIAL_PXA driver around. The original
> driver is just marked DEPRECATED in Kconfig and C source. When
> the original driver is considered safe to remove, no changes
> to SERIAL_8250 will be necessary.
> 
> Compiling SERIAL_8250_CONSOLE and SERIAL_PXA_CONSOLE even without
> SERIAL_8250_PXA breaks console for SERIAL_PXA. For this reasons, the new
> and the original drivers are made mutually exclusive.
> 
> Signed-off-by: Sergei Ianovich <ynvich@...il.com>
> CC: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

Thanks,

-- 
heikki
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