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 -- 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
