On 25/04/17 11:33, Philipp Zabel wrote: > On Tue, 2017-04-25 at 11:05 +0100, Jon Hunter wrote: >> On 25/04/17 05:15, Vivek Gautam wrote: >>> On 04/24/2017 06:15 PM, Jon Hunter wrote: >>>> On 18/04/17 12:21, Vivek Gautam wrote: >>>>> Make use of reset_control_array_*() set of APIs to manage >>>>> an array of reset controllers available with the device. >>>> Before we apply this patch, I need to check to see if the order of the >>>> resets managed by the PMC driver matter. Today the order of the resets >>>> is determined by the order they appear in the DT node and although the >>>> new APIs work in the same way they do not guarantee this. So let me >>>> check to see if we can any concerns about ordering here. Otherwise would >>>> be nice to use these APIs. >>> >>> Right, that will be perfect. >> >> So I don't see any restrictions here and so I think this change is fine. > > Thank you for checking. > >> BTW, for the DT case, is there any reason why we don't just say the >> order will be determine by the order the resets are list in the DT node? > > I'd rather not make any promises, so I don't have to care about keeping > them. This makes it easier to think about and allows for more freedom in > changing the core code if needed. > > What if in the future there is a use case for enabling a bunch of resets > by flipping a number of bits in a single register at the same time? Or > if people accidentally depend on the ordering when in reality there is a > small delay necessary between assertions that just happens to be hidden > by the framework overhead? > > If there is a use case for an array of reset controls that must be > (de)asserted in a fixed order and doesn't need any delay between the > steps and is not suitable to be described by named resets for some > reason, we can discuss this. Until then, I'm happy that tegra pmc can > handle arrays without any particular ordering. OK, makes sense. Thanks Jon -- nvpublic -- 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
