On Sat, Jan 07, 2017 at 10:54:56AM +0200, Krzysztof Kozlowski wrote: > On Thu, Jan 05, 2017 at 02:01:53PM +0800, Peter Chen wrote: > > 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 > > library to cover this requirement. The core code has supplied > > some common helpers for host driver, and individual power sequence > > libraries handle kinds of power sequence for devices. The pwrseq > > librares always need to allocate extra instance for compatible > > string match. > > > > pwrseq_generic is intended for general purpose of power sequence, which > > handles gpios and clocks currently, and can cover other controls in > > future. The host driver just needs to call of_pwrseq_on/of_pwrseq_off > > if only one power sequence is needed, else call of_pwrseq_on_list > > /of_pwrseq_off_list instead (eg, USB hub driver). > > > > For new power sequence library, it can add its compatible string > > to pwrseq_of_match_table, then the pwrseq core will match it with > > DT's, and choose this library at runtime. > > > > Signed-off-by: Peter Chen <peter.chen@xxxxxxx> > > Tested-by: Maciej S. Szmigiero <mail@xxxxxxxxxxxxxxxxxxxxx> > > Tested-by Joshua Clayton <stillcompiling@xxxxxxxxx> > > Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx> > > Tested-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx> > > Acked-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx> > Tested on Odroid U3 (reset sequence for LAN9730): > Tested-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx> > A nice ping... -- Best Regards, Peter Chen -- 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
