On Thu, Nov 10, 2011 at 04:58:27PM +0530, R, Durgadoss wrote: > > > Current[1-N]_limit - set of current limits > > > Voltage[1-X]_limit - set of voltage limits > > What would the voltage limits be? Whatever is going on here there > > should be some integration with the regulator framework, modern > > regulators are often able to report when they go out of regulator and > > able to impose current limits. > These (limits) are configurable voltage limits. The HW generates an > Interrupt when any of these configured voltage limits are crossed. > Similarly, for Current also. > Now, Say there are 3 current limits that we can program. > On the first and second limit violation we take some actions, > and control the current consumption, so that it does not hit the > worst current limit. So what you mean is that these are maxima. I'm not sure that the voltage limits are terribly useful on regulated supplies; the voltages tend not to be varied autonomously by hardware and even where they are they're not directly tied to power consumption which is usually the actual problem. On unregulated supplies like the battery output it's more useful and it's something that the existing power framework already has some support for reporting current flows, my first guess would be that for the unregulated supplies you'd build on top of that (and there will be overlap with the charger management for the devices that need hand holding to do that). Current limits are more generally useful, they apply equally well to regulated and unregulated supplies. You probably want to tie this stuff in with the thermal management work that people are starting to look at - it sounds like you're basically trying to look at a different aspect of the same problem. > Do you think, we can fit this into the regulator framework ? That's not something that the hardware generally supports; for voltages you'll usually just get an out of regulation notification and current limits generally just give you a single trip point. > But I would like to see a 'consumer' driver that uses the framework > efficiently, so that I can get some more idea. Could you point to > some source files ? find linux-2.6 -type f | xargs grep -l regulator_ should show a bunch of devices, nothing actually using any form of limiting at the minute though. Any regulator driver which notifies will be able to show when it goes out of regulation. -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
