AM3352: SMBus Block Read/Write support on I2C0 of AM3352

Divyeshkumar M

Part Number: AM3352

Hello,

We're working on a custom board using AM3352 and we have a USB Hub (USB2422) on I2C0. In order to configure the hub, we need to communicate to chip over I2C0 as SMBus. Now, the USB hub chip only supports SMBus Block Read and Write operations. When I checked the capabilities of I2C0 on AM3352, I see below results:

Functionalities implemented by /dev/i2c-0:
I2C                              yes
SMBus Quick Command              no
SMBus Send Byte                  yes
SMBus Receive Byte               yes
SMBus Write Byte                 yes
SMBus Read Byte                  yes
SMBus Write Word                 yes
SMBus Read Word                  yes
SMBus Process Call               yes
SMBus Block Write                yes
SMBus Block Read                 no
SMBus Block Process Call         no
SMBus PEC                        yes
I2C Block Write                  yes
I2C Block Read                   yes

So it looks like the SMBus Block Write operation is not supported on AM3352's I2C0 bus. Can any one please confirm this for us, that whether the I2C0 bus on AM3352 supports SMBus Block Read and Write or not?

Thanks,

Divyeshkumar

over 6 years ago

0 Nick Saulnier over 6 years ago

TI__Guru** 101250 points

Hello Divyeshkumar,

What version of Linux are you using?

Regards,
Nick

0 Divyeshkumar M over 6 years ago in reply to Nick Saulnier

Expert 1390 points

Hi Nick,

I am using 4.9.41-ge3a80a1c5c. I am using processor-sdk-04.01.00.06-config SDK.

Thanks,
Divyeshkumar

0 Nick Saulnier over 6 years ago in reply to Divyeshkumar M

TI__Guru** 101250 points

Hello Divyeshkumar,

It does not look like SMBus Block Read and Write is currently supported. This post might have some ideas you could try.

Regards,

Nick

0 Divyeshkumar M over 6 years ago in reply to Nick Saulnier

Expert 1390 points

Hi Nick,

The command output above says that the SMBus Block Write is valid operation. Only Block Read is not supported. Please confirm.

Thanks,
D

0 Nick Saulnier over 6 years ago in reply to Divyeshkumar M

TI__Guru** 101250 points

Hello Divyeshkumar,

You are correct. Block write is valid, but block read is not supported on any of our current software releases. I do not think our software team has plans to implement block read at the moment, but I will check just in case.

Regards,
Nick

0 Divyeshkumar M over 6 years ago in reply to Nick Saulnier

Expert 1390 points

Hi Nick,

Thanks for your input.

Regards,
Divyeshkumar

0 Nick Saulnier over 6 years ago in reply to Divyeshkumar M

TI__Guru** 101250 points

Hello Divyeshkumar,

There are no current plans to implement block read. TI may or may not add it in the future, but if if is eventually added it would be further out than 6 months from now.

Regards,
Nick

0 Divyeshkumar M over 6 years ago in reply to Nick Saulnier

Expert 1390 points

Hi Nick,

Thank you for the updates.

Regards,
Divyeshkumar

0 Nick Saulnier over 6 years ago in reply to Divyeshkumar M

TI__Guru** 101250 points

Just as an FYI, I have gone ahead and submitted a request to add block read. The software team has not accepted it at this point, but if they did it would not be released until mid 2019 or later.

Regards,
Nick

0 Divyeshkumar M over 6 years ago in reply to Nick Saulnier

Expert 1390 points

Hi Nick,

Thanks for the info and your efforts. I really appreciate it.

Best regards,
Divyeshkumar

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AM3352: SMBus Block Read/Write support on I2C0 of AM3352