From: Anton Vorontsov <avorontsov@ru•mvista.com>
To: Timur Tabi <timur@freescale•com>
Cc: linuxppc-dev@ozlabs•org
Subject: Re: [PATCH] CS4270 node is misplaced in the MPC8610 device tree
Date: Mon, 19 May 2008 22:42:38 +0400 [thread overview]
Message-ID: <20080519184238.GA17046@polina.dev.rtsoft.ru> (raw)
In-Reply-To: <4831C4F0.6060000@freescale.com>
On Mon, May 19, 2008 at 01:20:32PM -0500, Timur Tabi wrote:
> Timur Tabi wrote:
> > The CS4270 is using the second I2C bus, not the first, on the Freescale
> > MPC8610 HPCD, so its node in the device tree belongs under 'i2c@3100'
> > and not 'i2c@3000'.
> >
> > Signed-off-by: Timur Tabi <timur@freescale•com>
>
> Please disregard this patch. It turns out that that both I2C controllers are
> connected to the same bus, so it technically doesn't matter which node a device
> is a child of. However, tests show that sometimes one parent works, and
> sometimes the other parent works.
Hm... this should be controlled by the PIXIS' BRDCFG0's I2CSPAN and
SERSEL bits:
0: I2C1 and I2C2 buses are separated. System (boot sequencer EEPROM)
is on I2C1, all others are on I2C2. MPC8610 SPI functions cannot be used.
1: I2C1 and I2C2 are bridged. MPC8610 SPI functions may be used. All I2C
devices may be accessed via I2C1 controller and/or I2C2 (I2C2 depends on
SERSEL setting).
--
Anton Vorontsov
email: cbouatmailru@gmail•com
irc://irc.freenode.net/bd2
next prev parent reply other threads:[~2008-05-19 18:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-14 22:29 [PATCH] CS4270 node is misplaced in the MPC8610 device tree Timur Tabi
2008-05-19 18:20 ` Timur Tabi
2008-05-19 18:42 ` Anton Vorontsov [this message]
2008-05-19 19:20 ` Timur Tabi
2008-05-19 20:17 ` Timur Tabi
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