* Paul Walmsley <paul@xxxxxxxxx> [080717 05:00]: > > Hello everyone, > > this is the third version of the OMAP PM interface patch. > > Major changes since the second revision: > > 1. set_max_mpu_wakeup_lat() has been added. This is intended to limit > the amount of time needed for the MPU to wake up and enter a device > driver's interrupt handler. > > 2. set_max_dma_lat() has been renamed to set_max_sdma_lat() > > 3. omap_pm_dsp_get_opp_table() and struct omap_opp have been added for > future DSPBridge/CPUFreq use. omap_pm_if_init() now takes pointers > to struct omap_opp arrays that are intended to be passed in from the > board-*.c files. > > 4. Interface documentation has been moved to the > include/asm-arm/arch-omap/omap-pm.h file. > > 5. Documentation updated and moved into Documentation/arm/OMAP/omap_pm > > > Further comments welcome, I think we need to run this by LKML, linux-arm-kernel, and linux-pm before we integrate these. Can you repost these for comments one more time so we get comments from other mailing lists? Thanks, Tony > > > - Paul > > --------------------------------- > > This message proposes the third version of a power management > interface (the "OMAP PM interface") for the linux-omap kernel tree. > > It includes a general device driver PM interface, along with some > specialized interfaces for CPUFreq, DSPBridge, and the > powerdomain/clockdomain code. This message focuses on the general > device driver portion, since it is most relevant to the larger > community of OMAP device driver developers. > > The interface is intended to allow drivers to take advantage of OMAP > power management features: > > - without locking drivers into a particular underlying implementation; > > - without adding constraints that are specific to particular OMAP > variants; and > > - without affecting other architectures. > > The device driver portion of the interface covers four types of PM > constraints: > > 1. Set the maximum MPU wakeup latency > > 2. Set the maximum device wakeup latency > > 3. Set the maximum system DMA transfer start latency (CORE pwrdm) > > 4. Set the minimum bus throughput needed by a device > > > These are described in more detail in the patch. > > This interface is intended to be temporary, to survive only until the > Linux PM QoS layer supports these features. > > This interface is a collaborative product of many people from Nokia > and TI: Karthik Dasu, Jouni Högander, Tony Lindgren, Rajendra Nayak, > Sakari Poussa, Veeramanikandan Raju, Anand Sawant, Igor Stoppa, Paul > Walmsley, and Richard Woodruff. > > Included in the patch is a 'no-op' implementation that documents the > interface and emits debug messages. Rajendra Nayak at TI has > developed an initial implementation of the OMAP PM interface that > relies mostly on TI's Shared Resource Framework. Also under > development is an implementation of the OMAP PM code that uses the > existing Linux PM QoS code. > > > Comments welcomed, > > - Paul > > -- > To unsubscribe from this list: send the line "unsubscribe linux-omap" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
