Hi, We originally tried to add runtime PM support for I2C adapter devices in order to have runtime PM core to power on the I2C host controller device automatically whenever any of its children I2C device is powered on (See [1] for the last patch series). The rationale was that it is what the ACPI 5.0 specification requires: the parent device cannot be lower power states than its children. However, it looks like Windows can put the I2C controller device to low power states independently of its children power states, just like Linux does. This patch series only adds I2C and SPI devices to the ACPI power domain and make sure that the parent device power state is ignored when transitioning child device to a different power states. Since patches [2-3/3] depend on patch [1/3] it would be good if these all could be merged together. [1] http://lwn.net/Articles/568961/ Lv Zheng (1): i2c: attach/detach I2C client device to the ACPI power domain Mika Westerberg (2): ACPI / PM: allow child devices to ignore parent power state spi: attach/detach SPI device to the ACPI power domain drivers/acpi/device_pm.c | 8 +++++--- drivers/i2c/i2c-core.c | 10 ++++++++++ drivers/spi/spi.c | 20 ++++++++++++++++++-- include/acpi/acpi_bus.h | 3 ++- 4 files changed, 35 insertions(+), 6 deletions(-) -- 1.8.4.rc3 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
