Hi Peter, On 17.06.2016 12:09, Peter Chen wrote: > Hi all, > > We have an well-known problem that the device needs to do some power > sequence before it can be recognized by related host, the typical > example like hard-wired mmc devices and usb devices. This power > sequence is hard to be described at device tree and handled by > related host driver, so we have created a common power sequence > framework to handle this requirement. The generic code is supplied > some common helpers from host driver, and individual power sequence > driver handles kinds of power sequence for devices. > > Since the MMC has already done the similar things, and this power > sequence handling can be generic, we use mmc power sequence code > as base to create this framework. > > This patch set is based on Krzysztof Kozlowski's RFC patch set (v4.7-rc1) > [1], and making some changes which can let it be generic. After that, > we create a generic power sequence driver for USB devices which handles > below things, it includes all input signals for devices I can consider. > > - Clock and its frequencies > - GPIO for reset and the duration time > - GPIO for enable > - Regulator for power > > This patch set is tested on i.mx6 sabresx evk using a dts change, I use > two hot-plug devices to simulate this use case. The udoo board changes > were tested using my last power sequence patch set. [2] > > @Maciej S. Szmigiero, Oscar, would you please test them on imx6qdl udoo > boards? Thanks for the patch set, just tested them on my UDOO Quad board and can confirm that USB and on-board hub work fine. Tested-by: Maciej S. Szmigiero <mail@xxxxxxxxxxxxxxxxxxxxx> Maciej -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
