From: Robert Schwebel <robert@schwebel.de>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] I2C Initialization
Date: Wed, 5 Mar 2003 15:44:41 +0100 [thread overview]
Message-ID: <20030305144441.GD16290@pengutronix.de> (raw)
In-Reply-To: <NNEHJEGKOBOALJLKPJLDMEEOCDAA.bezanson@attbi.com>
On Wed, Mar 05, 2003 at 08:05:45AM -0500, Adam Bezanson wrote:
> I don't have the ability to control the I2C lines directly from the
> processor. I'm using a 7410. I have a System controller chip which has
> the I2C master controller in it. All it provides is a higher lever
> indirect access register interface to control I2C transactions.
>
> I have though about controlling the power supply to the I2C slaves and
> have them controled by register bits in memory space. But this would
> require alot of rework of the hardware at several places in my
> particular system.
>
> In terms of your question of the system hanging while masking reset to
> the processor, I was thinking of adding a timer in hardware to unmask
> the reset if it's set too long. Thanks for making sure I've thought of
> all the obvious corner cases.
All these answers let me conclude that we need a board specific
board_i2c_reset() function. I'll prepare a patch.
Robert
--
Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
Pengutronix - Linux Solutions for Science and Industry
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next prev parent reply other threads:[~2003-03-05 14:44 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-04 13:24 [U-Boot-Users] Board init Robert Schwebel
2003-03-04 15:27 ` Wolfgang Denk
2003-03-04 15:57 ` Robert Schwebel
2003-03-05 2:20 ` Adam Bezanson
2003-03-05 5:42 ` [U-Boot-Users] I2C Initialization Reinhard Meyer
2003-03-05 8:15 ` Wolfgang Denk
2003-03-05 13:05 ` Adam Bezanson
2003-03-05 14:44 ` Robert Schwebel [this message]
2003-03-05 17:39 ` Robert Schwebel
2003-03-05 19:12 ` Wolfgang Denk
2003-03-06 6:21 ` Robert Schwebel
2003-03-06 8:01 ` Wolfgang Denk
2003-03-06 8:40 ` Robert Schwebel
2003-03-06 9:24 ` Wolfgang Denk
2003-03-06 9:47 ` Robert Schwebel
2003-03-12 8:31 ` Joakim Tjernlund
2003-03-12 8:43 ` Robert Schwebel
2003-03-12 10:24 ` Joakim Tjernlund
2003-03-14 13:38 ` [U-Boot-Users] I2C Initialization, important Update!! Joakim Tjernlund
2003-03-14 14:08 ` Wolfgang Denk
2003-03-14 14:29 ` Joakim Tjernlund
2003-03-05 8:10 ` [U-Boot-Users] Board init Wolfgang Denk
2003-03-05 8:12 ` Robert Schwebel
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