
On Wed, 20 Mar 2024 at 18:04, Caleb Connolly caleb.connolly@linaro.org wrote:
On 20/03/2024 12:33, Caleb Connolly wrote:
On 19/03/2024 13:55, Sumit Garg wrote:
On Tue, 19 Mar 2024 at 17:52, Caleb Connolly caleb.connolly@linaro.org wrote:
The USB VBUS supply for the type-A port is enabled via a GPIO regulator. This is incorrectly modelled in Linux where only the PCIe dependency is expressed.
Can we send a fix for the Linux kernel DTS to correctly model it? We can then later get rid of this modification once that is accepted.
I spoke to Bjorn about this and apparently the correct way to model this will be to have a usb-connector node with a vbus-supply property. There is some work underway in Linux to support this kind of thing already.
In the mean time he suggested to just make the regulator always-on, so I sent a patch to do that [1]. I actually hit this issue when booting from USB as the PCIe drivers aren't available in the initramfs, so USB never turns on, and the always-on hack fixes that.
In the mean time, we'll still need this vbus-supply reference as U-Boot doesn't automatically probe regulators.
Try adding regulators_enable_boot_on() to the common board code. With that there shouldn't be any need for this vbus-supply reference.
oh, forgot the link!
-Sumit