Hi Martin, On 10 March 2017 at 01:06, Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> wrote: > Hi Anand, > > On Thu, Mar 9, 2017 at 6:58 PM, Anand Moon <linux.amoon@xxxxxxxxx> wrote: >>> Hi Anand, >>> >>> For this specific use case, the only way to manage this is to use the Work-In-Progress >>> Power Sequence Library proposer by Peter Chen at : >>> https://lkml.org/lkml/2016/11/13/315 >>> >>> Since this is the USB Hub reset link and has no direct link with either the USB controller >>> or the USB PHY, and the USB Hus cannot be modeled (yet ?) in the DT. >>> >>> One intermediate, but crappy, solution would be to add a GPIO hog until the power >>> sequence code has been merged, with a proper big fat warning in the dts file. >>> >>> You can find doc about the gpio-hog in : >>> Documentation/devicetree/bindings/gpio/gpio.txt >>> >>> It should look like : >>> >>> usb-hub { >>> gpio-hog; >>> gpios = <GPIOAO_4 GPIO_ACTIVE_HIGH>; >>> output-high; >>> line-name = "usb-hub-reset"; >>> }; >>> >>> in the gpio_ao controller node. >>> >>> Neil >> >> Thanks for this input. >> >> I will check this series of patches, and work on this new approach. > you might want to look at the following two patches as well: [0] and [1] > I didn't test them as I don't have an Odroid-C2 but they should work > with the series that Neil has mentioned. feel free to take my patches > and fix them where needed > > > Regards, > Martin > > [0] https://github.com/xdarklight/linux/commit/f0bc8f826b465fbf24279ce78654b65282790dc6 > [1] https://github.com/xdarklight/linux/commit/7b5a69bf5bad992249aa39a96360fe90ccde9cd5 As pointed by Neil For this specific use case, the only way to manage this is to use the Work-In-Progress Power Sequence Library proposer by Peter Chen at : https://lkml.org/lkml/2017/1/5/33 (updated v11) Using above series I was able to get the usb nodes to work correctly on Odroid C2. Although the series of patches did not clean apply completely. I manage to get this working with your above patches. I will submit the patches soon. root@odroid64:~# lsusb -t /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M |__ Port 1: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M |__ Port 1: Dev 3, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M |__ Port 2: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 480M |__ Port 4: Dev 5, If 0, Class=Mass Storage, Driver=usb-storage, 480M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M root@odroid64:~# Best Regards -Anand Moon -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
