linux-kernel - Re: [PATCH 1/2] i2c-mv64xxx: Fix timing issue on Armada XP (errata FE-8471889)

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Message-ID: <20130607182500.10593e73@skate>
Date:	Fri, 7 Jun 2013 18:25:00 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>, Nicolas Pitre <nico@...xnic.net>,
	Lior Amsalem <alior@...vell.com>,
	Maen Suleiman <maen@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Shadi Ammouri <shadi@...vell.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Yehuda Yitschak <yehuday@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Ike Pan <ike.pan@...onical.com>,
	Chris Van Hoof <vanhoof@...onical.com>,
	Dan Frazier <dann.frazier@...onical.com>,
	Leif Lindholm <leif.lindholm@....com>,
	Jon Masters <jcm@...hat.com>,
	David Marlin <dmarlin@...hat.com>,
	linux-kernel@...r.kernel.org, Zbigniew Bodek <zbb@...ihalf.com>
Subject: Re: [PATCH 1/2] i2c-mv64xxx: Fix timing issue on Armada XP (errata
 FE-8471889)

Dear Gregory CLEMENT,

On Fri,  7 Jun 2013 17:48:59 +0200, Gregory CLEMENT wrote:

> +/*
> + * 5us delay in order to avoid repeated start
> + * timing violation on Armada XP SoC.
> + */
> +static int mv64xxx_i2c_errata_delay;

This should probably be a per-I2C controller variable, i.e in
mv64xxx_i2c_data.


> +	if (!mv64xxx_i2c_errata_delay &&
> +	    of_machine_is_compatible("marvell,armadaxp"))
> +		mv64xxx_i2c_errata_delay = 1;

I am wondering whether it should be done this way, or using a separate
DT property.

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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