[U-Boot] omap3 i2c issues

[U-Boot] omap3 i2c issues

[Murali K. Vemuri]

Hi There,

I am using a omap3 based board and U-Boot version 03.00.02.07.
when I do "i2c probe", this results in : 38  3C  3D  3F.

I found that Kernel TWL is dumping messages to 48  49  4A & 4B.

I tried the the same on the "reference board and the corresponding
u-boot" supplied from Mistral , when I type "iprobe", I get the
output: 48 49 4A 4B.

I further verified that on my board, if I do "i2c mw 0x3C 0 0x34 0x10"
I am able to write into I2C and "i2c md 0x3C 0 0x10" I am able to read
back . This however, works only on 0x3c. "mw" & "md" are working on
0x3c only. 38, 3d & 3f are returning error.

I could not understand what is missing here? How come my board U-boot
is getting a chip id different?
is there a setting that I can do? my Hardware engineer says the OMAP3
connections are same between our board and evm board.

ideally my question boils down to: how can I get the device ids
correctly (or is it possible to change them)?

Thanks & regards
Murali

[U-Boot] omap3 i2c issues

[Heiko Schocher]

Hello Murali,

Murali K. Vemuri wrote:
> I am using a omap3 based board and U-Boot version 03.00.02.07.

There is no such a version in mainline ...

> when I do "i2c probe", this results in : 38  3C  3D  3F.
> 
> I found that Kernel TWL is dumping messages to 48  49  4A & 4B.
> 
> I tried the the same on the "reference board and the corresponding
> u-boot" supplied from Mistral , when I type "iprobe", I get the
> output: 48 49 4A 4B.

here on my omap3_beagle board:

U-Boot 2010.09-05496-gbafe743-dirty (Oct 14 2010 - 09:26:57)

OMAP3530-GP ES3.0, CPU-OPP2, L3-165MHz, Max CPU Clock 600 mHz
OMAP3 Beagle board + LPDDR/NAND
I2C:   ready
DRAM:  256 MiB
NAND:  256 MiB
In:    serial
Out:   serial
Err:   serial
Beagle Rev C1/C2/C3
Die ID #00b000030000000004013f8a1700900c
Hit any key to stop autoboot:  0
OMAP3 beagleboard.org # i2c probe
Valid chip addresses: 48 49 4A 4B
OMAP3 beagleboard.org #

So, I think, i2c driver should be ok.

> I further verified that on my board, if I do "i2c mw 0x3C 0 0x34 0x10"
> I am able to write into I2C and "i2c md 0x3C 0 0x10" I am able to read
> back . This however, works only on 0x3c. "mw" & "md" are working on
> 0x3c only. 38, 3d & 3f are returning error.
> 
> I could not understand what is missing here? How come my board U-boot
> is getting a chip id different?
> is there a setting that I can do? my Hardware engineer says the OMAP3
> connections are same between our board and evm board.

pinsetup, clock setup?

bye,
Heiko
-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

[U-Boot] omap3 i2c issues

[Murali K. Vemuri]

Hi,
Thanks for the info, but is there any way to detect whats probably going wrong?
any help / pointers are highly appreciated.
Thanks & regards
Murali

On Tue, Nov 16, 2010 at 5:53 PM, Heiko Schocher <hs@denx.de> wrote:
> Hello Murali,
>
> Murali K. Vemuri wrote:
>> I am using a omap3 based board and U-Boot version 03.00.02.07.
>
> There is no such a version in mainline ...
>
>> when I do "i2c probe", this results in : 38 ?3C ?3D ?3F.
>>
>> I found that Kernel TWL is dumping messages to 48 ?49 ?4A & 4B.
>>
>> I tried the the same on the "reference board and the corresponding
>> u-boot" supplied from Mistral , when I type "iprobe", I get the
>> output: 48 49 4A 4B.
>
> here on my omap3_beagle board:
>
> U-Boot 2010.09-05496-gbafe743-dirty (Oct 14 2010 - 09:26:57)
>
> OMAP3530-GP ES3.0, CPU-OPP2, L3-165MHz, Max CPU Clock 600 mHz
> OMAP3 Beagle board + LPDDR/NAND
> I2C: ? ready
> DRAM: ?256 MiB
> NAND: ?256 MiB
> In: ? ?serial
> Out: ? serial
> Err: ? serial
> Beagle Rev C1/C2/C3
> Die ID #00b000030000000004013f8a1700900c
> Hit any key to stop autoboot: ?0
> OMAP3 beagleboard.org # i2c probe
> Valid chip addresses: 48 49 4A 4B
> OMAP3 beagleboard.org #
>
> So, I think, i2c driver should be ok.
>
>> I further verified that on my board, if I do "i2c mw 0x3C 0 0x34 0x10"
>> I am able to write into I2C and "i2c md 0x3C 0 0x10" I am able to read
>> back . This however, works only on 0x3c. "mw" & "md" are working on
>> 0x3c only. 38, 3d & 3f are returning error.
>>
>> I could not understand what is missing here? How come my board U-boot
>> is getting a chip id different?
>> is there a setting that I can do? my Hardware engineer says the OMAP3
>> connections are same between our board and evm board.
>
> pinsetup, clock setup?
>
> bye,
> Heiko
> --
> DENX Software Engineering GmbH, ? ? MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
>