[PATCH v6 0/8] mfd: introduce a driver for LPSS devices on SPT

Andy Shevchenko
2015-07-27T15:03:55Z

The new coming Intel platforms such as Skylake will contain Sunrisepoint PCH.

The driver is based on MFD framework since the main device, i.e. serial bus
controller, contains register space for itself, DMA part, and an additional
address space (convergence layer).

The public specification of the register map is avaiable in [1].

This is sixth generation of the patch series to bring support LPSS devices
found on Intel Sunrisepoint (Intel Skylake PCH). Previous one can be found here
[2].

The series has few logical parts:
- patches 1-3 prepares PM core, ACPI, and driver core (PM) to handle our case
- patches 4-6 introduce unregistering platform devices in MFD in reversed
order
- patch 7 implements iDMA 64-bit driver
- patch 8 introduces an MFD driver for LPSS devices

The driver has been tested with SPI and UART on Intel Skylake PCH.

Stephen, can you, please, have a look into patch 8 regarding to clock name
matching and other stuff Lee asked?

[1] https://download.01.org/future-platform-configuration-hub/skylake/register-definitions/332219-002.pdf
[2] http://www.spinics.net/lists/linux-acpi/msg59267.html

Changelog v6:
- rebase on top of v4.2-rc4
- address Vinod's comments regarding to idma64 driver
- fix a bug in idma64 driver found by our Q/A team (use after free)

Changelog v5:
- rebase on top of v4.2-rc1
- patch 3 is modified accordingly to new changes in drivers/base/dd.c
- correct Rafael's email in patch 3

Changelog v4:
- replace patch 3 by Rafael's suggession
- append ACKs from Rafael
- rebase on top of v4.1-rc8

Changelog v3:
- rework patch 3 to be used for all kind of devices (address Alan comment)
- iDMA 64-bit driver improvements:
- fix burst-to-register conversion
- remove excessive locking
- do not expose core part to the user (Kconfig)
- address most of Lee's comments
- append ACKs
- rebase on top of v4.1-rc6

Changelog v2:
- new DMA driver to fully support iDMA 64-bit IP
- patch 3 is added to wake up parent devices when ->probe(), ->remove(), or
->shutdown()
- MFD core is unregistering devices in reversed order
- address few Lee's comments on v1
- address Russel's comment, therefore use clkdev_create() helper
- intel-lpss{,-acpi,-pci} are modified regarding to above changes

Andy Shevchenko (5):
klist: implement klist_prev()
driver core: implement device_for_each_child_reverse()
mfd: make mfd_remove_devices() iterate in reverse order
dmaengine: add a driver for Intel integrated DMA 64-bit
mfd: Add support for Intel Sunrisepoint LPSS devices

Mika Westerberg (2):
PM / QoS: Make it possible to expose device latency tolerance to
userspace
ACPI / PM: Attach ACPI power domain only once

Rafael J. Wysocki (1):
Driver core: wakeup the parent device before trying probe

drivers/acpi/device_pm.c | 8 +
drivers/acpi/internal.h | 2 +
drivers/acpi/scan.c | 46 ++-
drivers/base/core.c | 43 +++
drivers/base/dd.c | 20 ++
drivers/base/power/power.h | 2 +
drivers/base/power/qos.c | 37 +++
drivers/base/power/sysfs.c | 11 +
drivers/dma/Kconfig | 8 +
drivers/dma/Makefile | 1 +
drivers/dma/idma64.c | 710 ++++++++++++++++++++++++++++++++++++++++++
drivers/dma/idma64.h | 233 ++++++++++++++
drivers/mfd/Kconfig | 23 ++
drivers/mfd/Makefile | 3 +
drivers/mfd/intel-lpss-acpi.c | 84 +++++
drivers/mfd/intel-lpss-pci.c | 113 +++++++
drivers/mfd/intel-lpss.c | 524 +++++++++++++++++++++++++++++++
drivers/mfd/intel-lpss.h | 62 ++++
drivers/mfd/mfd-core.c | 2 +-
include/linux/device.h | 2 +
include/linux/klist.h | 1 +
include/linux/pm_qos.h | 5 +
lib/klist.c | 41 +++
23 files changed, 1964 insertions(+), 17 deletions(-)
create mode 100644 drivers/dma/idma64.c
create mode 100644 drivers/dma/idma64.h
create mode 100644 drivers/mfd/intel-lpss-acpi.c
create mode 100644 drivers/mfd/intel-lpss-pci.c
create mode 100644 drivers/mfd/intel-lpss.c
create mode 100644 drivers/mfd/intel-lpss.h

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2.4.6