Hi,
Am Mi., 8. Sept. 2021 um 16:07 Uhr schrieb Heiko Thiery heiko.thiery@gmail.com:
Hi,
Am Mi., 8. Sept. 2021 um 15:08 Uhr schrieb Heiko Thiery heiko.thiery@gmail.com:
Hi Peng,
I faced an issue with the I2C bus speed in SPL for the imx8mq. I figured out that the bus frequency is set to about 1MHz. While digging into that I found that the clk ID for the I2C is not returned for the imx8mq correctly.
Can you confirm that this is missing here.
This is what I added and now it looks better.
Just measured the frequency and it is still not ok. It changed from 1MHz to 400kHZ. But expected is 100KHz.
Hi. I think now I understand that the SPL configures the I2C to 100kHz and after that U-Boot will configure the 400kHz frequency due to the dts configuration. I will measure the SPL vs U-Boot frequencies tomorrow. I will confirm that after that.