Hi Peter, On 09.10.2018 03:24, Peter Chen wrote:
The topic has been discussed before: [1] And there is some implementation in the vendor kernel: [2] It seems like two things need to be done: 1. Switch the pinmux of the strobe signal to use a pullup after the core has been initialized. 2. Enable HSIC mode and HSIC clock This patch only implements these basics in a minimal approach. You need to have an additional pinmux setting "active" in the dt, that sets the pullup. It was tested with the SMSC LAN9730 USB Ethernet adapter on the iMXceet Solo S board.Thanks, I should do it earlier, I could not find a suitable board with HSIC support at mainline kernel. It is very kind that you could help on it and test function at real board. My suggestion is follow all flows in Link [2] since we need to cover suspend/resume and remote wakeup.
It seems like power management and other things in the linux-imx kernel are not fully implemented in mainline so there are quite a few differences.
My knowledge of USB, etc. is very limited, so I guess this is currently beyond my skills. Can you or someone else provide a patch to get started? I could help with testing, reviewing, etc.
Or maybe you can point out what needs to be done in more detail? Thanks, Frieder
