On Fri, May 29, 2015 at 11:21:36AM +0530, Laxman Dewangan wrote: > In our system, CPU-DFLL is another HW module which controls the CPU voltage > based on CPU frequency request. It issues the i2c command to the device for > voltage change when frequency get change. For this reason, CPU-DFLL need the > VSEL register address. The CPU DVFS SW driver controls the DVS input pin to > control sleep entry/exit and VOUT0 for voltage change. So on this case, we > really donot need to change the VSEL register address for active state > voltage change and use the DVS for sleep entry/exit.
Sure, that's the normal use case for this stuff. > The problem will be there when external controller use the DVS pin for DVFS > and need two register address here. In this case, I think external > controller need to get information from different mechanism rather than via > regulator driver to avoid complication on regulator driver/framework. Probably, it's definitely getting complicated (though in this case where we only need one register we ought to be more able to manage it, not that I have bright ideas right now).
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