Hi, This is second version of the patches. The previous version can be found here: http://www.spinics.net/lists/linux-i2c/msg13152.html With the advent of ACPI 5.0 we are starting to see I2C client devices described in ACPI namespace that support power management by the means of standard ACPI _PSx-methods. For example Intel Haswell based platforms might have touch screen or sensor-hub connected to the I2C bus that can be powered on and off by calling _PS0 and _PS3 -methods. In order to support such I2C client devices, we decided to hook the ACPI power management for these to the standard Linux runtime PM framework. These patches implement runtime PM support for I2C client devices in a similar way that is done already for the PCI bus. Just before a driver is bound to an I2C client device the device runtime PM is being prepared for that device. If the device in question has an ACPI handle we attach it to the ACPI power domain that then makes sure that the right _PSx methods are called in response to runtime PM events the driver generates. A driver that wants to participate in runtime PM and power manage its device should: 1) Implement device specific runtime PM callbacks if needed. 2) Call pm_runtime_put() (or some variant of that) to decrease the runtime PM reference count. If the driver doesn't do anything the device is regarded as runtime PM active and powered on. In the previous version we did this only for the I2C bus. However, Mark Brown suggested that the same thing should be done also for the SPI bus. This series now attempts to address that as well. In addition we convert the existing I2C client drivers to use this model to prevent any regressions from happening. I split the patches per subsystem and the maintainers should be in CC list. Note that I don't have hardware to test these existing I2C drivers so they are only compile tested (well, except the s5p-tv which I wasn't able to compile at all on x86). Since the I2C patches are dependent on the core support I suggest that if this gets merged, they would go through the I2C tree. The SPI part could go separately via SPI tree as there are no existing runtime PM users. Changes to the previous version: * Runtime PM is now unblocked by default. * The existing I2C drivers have been converted to this model. * Added runtime PM support for SPI devices. [ Rafael ACKed the previous version but I've changed the patches a bit, so I only kept his ACK in the second patch (it is unchanged). ] Aaron Lu (1): i2c: prepare runtime PM support for I2C client devices Lv Zheng (1): i2c: attach/detach I2C client device to the ACPI power domain Mika Westerberg (7): Input: misc - convert existing I2C client drivers to use I2C core runtime PM [media] s5p-tv: convert to use I2C core runtime PM drivers/misc: convert existing I2C clients driver to use I2C core runtime PM mfd: wm8994: convert to use I2C core runtime PM ASoC: codecs: convert existing I2C client drivers to use I2C core runtime PM spi: prepare runtime PM support for SPI devices spi: attach/detach SPI device to the ACPI power domain drivers/i2c/i2c-core.c | 53 +++++++++++++++++++++++++- drivers/input/misc/bma150.c | 4 +- drivers/input/misc/mpu3050.c | 16 ++------ drivers/media/platform/s5p-tv/sii9234_drv.c | 30 +++------------ drivers/mfd/wm8994-core.c | 5 +-- drivers/misc/apds9802als.c | 7 +--- drivers/misc/apds990x.c | 16 +++----- drivers/misc/bh1770glc.c | 12 +++--- drivers/misc/fsa9480.c | 2 - drivers/misc/isl29020.c | 3 +- drivers/spi/spi.c | 58 ++++++++++++++++++++++++++++- sound/soc/codecs/wm2200.c | 12 +++--- sound/soc/codecs/wm5100.c | 8 ++-- sound/soc/codecs/wm8962.c | 5 +-- 14 files changed, 147 insertions(+), 84 deletions(-) -- 1.8.4.rc3 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
