Linux/AM5718: PMIC I2C connect speed

Shinji Ueda

Part Number: AM5718

Tool/software: Linux

Hi champs,

I have a question about connect speed PMIC using I2C.

My understand is
Before u-boot DTS, I2C speed is standardmode_100kHz,
Then, after set on DTS, I2C speed become fastmode_400kHz.

My understand is correct?

&i2c1 {
status = "okay";
clock-frequency = <400000>;

linux-xxx\arch\arm\boot\dts\am57xx-beagle-x15-common.dtsi

Regards,

Shinji Ueda

over 8 years ago

0 Steve Kipisz over 8 years ago

TI__Genius 15510 points

Which SDK is this?

Steve K.

0 Nomo over 8 years ago in reply to Steve Kipisz

Guru 16800 points

Hello Steve-san,

Their SDK is v03.
Does the I2C behave change by SDK version?

Best Regards,
Nomo

0 Steve Kipisz over 8 years ago in reply to Nomo

TI__Genius 15510 points

It should not change by SDK version. I just like to debug on the same SDK where the issue was found.

Steve K.

0 Nomo over 8 years ago in reply to Steve Kipisz

Guru 16800 points

Hello Steve-san,

Thank you for your reply.
They just want to know whether the following specification is correct.
- While booting by ROM code, I2C speed is set to 100kHz.
- After boot Linux up, the I2C speed is set to 400kHz.
- This speed chage is set in the dts file.

Best Regards,
Nomo

0 Steve Kipisz over 8 years ago in reply to Nomo

TI__Genius 15510 points

You are correct.

Steve K.

0 Nomo over 8 years ago in reply to Steve Kipisz

Guru 16800 points

Hello Steve-san,

Thank you for your reply.

Best Regards,

Nomo

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Linux/AM5718: PMIC I2C connect speed