From: w.sang@pengutronix.de (Wolfram Sang)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] I2C: Set I2C timing registers for mxs-i2c
Date: Mon, 30 Apr 2012 22:27:42 +0200 [thread overview]
Message-ID: <20120430202742.GC28226@pengutronix.de> (raw)
In-Reply-To: <201204302209.12482.marex@denx.de>
> > > > > This sets the bus to run at 400kHz, prior to this,
> > > > > the bus frequency was undefined.
> > > >
> > > > Not exactly. The default values let it run at 100kHz.
> > >
> > > Have you tried dumping the default values and comparing it with the
> > > values for 100kHz in the manual?
> >
> > Yes, sure. Doesn't it work for you? I just rechecked and the values are
> > okay. That being said, if you make it configurable for 400kHz, it would
> > in deed be better to rewrite the values for 100kHz, too.
>
> They were different for me ... did you configure the i2c bus in your bootloader
> possibly? Those values might have been written there since then ... I didn't run
> i2c in u-boot before booting linux.
Nope, no I2C involved in the bootloader at all. Do you get the correct
values after soft-resetting the device?
It doesn't really matter, though. Just reinit them to the proper values
depending on the user setting.
--
Pengutronix e.K. | Wolfram Sang |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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next prev parent reply other threads:[~2012-04-30 20:27 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-29 22:36 [PATCH 1/2] I2C: Set I2C timing registers for mxs-i2c Marek Vasut
2012-04-29 22:36 ` [PATCH 2/2] I2C: Implement DMA support into mxs-i2c Marek Vasut
2012-04-30 6:05 ` Wolfram Sang
2012-04-30 12:10 ` Marek Vasut
2012-04-30 19:52 ` Wolfram Sang
2012-04-30 20:07 ` Marek Vasut
2012-04-30 20:30 ` Wolfram Sang
2012-04-30 20:45 ` Marek Vasut
2012-04-30 21:01 ` Wolfram Sang
2012-04-30 21:19 ` Marek Vasut
2012-05-01 13:58 ` Shawn Guo
2012-05-01 14:02 ` Marek Vasut
2012-05-01 14:09 ` Shawn Guo
2012-05-01 14:14 ` Marek Vasut
2012-05-01 14:37 ` Russell King - ARM Linux
2012-04-30 5:58 ` [PATCH 1/2] I2C: Set I2C timing registers for mxs-i2c Wolfram Sang
2012-04-30 12:05 ` Marek Vasut
2012-04-30 19:43 ` Wolfram Sang
2012-04-30 20:09 ` Marek Vasut
2012-04-30 20:27 ` Wolfram Sang [this message]
2012-04-30 20:47 ` Marek Vasut
2012-04-30 21:02 ` Wolfram Sang
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