Linux/AM3352: GPIO resets on kernel boot

Moses Christopher Bollavarapu

Intellectual 980 points

Part Number: AM3352

Tool/software: Linux

Hi,

I am getting a .7ms LOW signal for a gpio, while the board starts loading kernel (HIGH -> LOW -> HIGH)

FYI,

I am using custom AM3352 based board with Das U-boot.
Added pinmux entry in mux.c file (u-boot)
Added ti,no-reset-on-init to the gpio chip in DTS(linux)

over 6 years ago

0 Biser Gatchev-XID over 6 years ago

TI__Guru**** 393215 points

Please read e2e.ti.com/.../684056

0 Moses Christopher Bollavarapu over 6 years ago in reply to Biser Gatchev-XID

Intellectual 980 points

Hello Biser,

Do we need to make any change in u-boot as well ?

Or Just editing the file, omap_hwmod_33xx_43xx_ipblock_data.c is sufficient ?

By making the changes as mentioned in the link provided, I see no change and the issue still persists.

FYI, gpio is in Bank3

0 Kemal R. Shakir over 6 years ago in reply to Moses Christopher Bollavarapu

TI__Guru 55345 points

Hello Moses,

Moses Christopher said:
Do we need to make any change in u-boot as well ?

No, only the changes in kernel should be sufficient.

Moses Christopher said:
By making the changes as mentioned in the link provided, I see no change and the issue still persists.

Please, see this post. Try simply adding a "ti,no-reset-on-init" to the &gpio3 node.

Best regards,
Kemal

0 Kemal R. Shakir over 6 years ago in reply to Kemal R. Shakir

TI__Guru 55345 points

Hi Moses,

I’ve not heard back from you for a month. I hope we were able to help. I’m going to close the thread now and mark the issue resolved. If you have any follow-up questions, please reply to this thread or start a new thread.

Thanks,
Kemal

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Linux/AM3352: GPIO resets on kernel boot