Hello Stephen
Am 30.07.2013 20:56, schrieb Stephen Warren:
On 07/29/2013 10:28 PM, Heiko Schocher wrote:
Hello Stephen,
Am 29.07.2013 18:12, schrieb Stephen Warren:
On 05/04/2013 06:01 AM, Heiko Schocher wrote:
From: Simon Glass<s...@chromium.org>
This enables CONFIG_SYS_I2C on Tegra, updating existing boards and
the Tegra
i2c driver to support this.
Heiko, the latest U-Boot tree hangs during boot on Tegra, and "git
:-(
Could you enable debug printf?
bisect" points at this patch. Olof reported the issue to me.
Thanks!
Can you take a look at the code and see what might be wrong? Thanks.
Yep.
I suspect some kind of initialization ordering issue, since the boot
messages are:
-----
U-Boot SPL 2013.07-rc3-00038-g880540d (Jul 29 2013 - 10:04:37)
U-Boot 2013.07-rc3-00038-g880540d (Jul 29 2013 - 10:04:37)
TEGRA30
Board: NVIDIA Beaver
I2C: Caller requested bad clock: periph=-49, parent=2
-----
... and that "bad clock" message implies to me that the I2C driver is
initializing before it has parsed the correct clock ID out of device
tree.
Hmm... looking in the patch ... I can see nothing which changes
some initializing order ...
@Simon: Do you have an idea?
just found some wrong settings for tegra30:
In include/configs/tegra30-common.h:
/* Total I2C ports on Tegra30 */
#define TEGRA_I2C_NUM_CONTROLLERS 5
README says:
- drivers/i2c/tegra_i2c.c:
- activate this driver with CONFIG_SYS_I2C_TEGRA
- This driver adds 4 i2c buses with a fix speed from
100000 and the slave addr 0!
I think that's just stale documentation; Tegra20 had just 4 I2C
controllers, and the docs probably weren't updated for Tegra30 which has 5.
end yes, in the i2c driver are only 4 ports activated ... this
I don't see any limit in the driver; everything seems to use
TEGRA_I2C_NUM_CONTROLLERS.
should be changed ... but I think, this has nothing to do with
your problem ... but try to add in the i2c driver one more i2c adapter
for the case TEGRA_I2C_NUM_CONTROLLERS> 4
As I wrote here, add (at the end of the file):
#if TEGRA_I2C_NUM_CONTROLLERS > 4
U_BOOT_I2C_ADAP_COMPLETE(tegra4, tegra_i2c_init, tegra_i2c_probe,
tegra_i2c_read, tegra_i2c_write,
tegra_i2c_set_bus_speed, 100000, 0, 4)
#endif
bye,
Heiko
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