From: Srinivas Kandagatla srinivas.kandagatla@linaro.org
Thanks for everyone who reviewed v6 patchset, here is v7 with review comments addressed.
SLIMbus (Serial Low Power Interchip Media Bus) is a specification developed by MIPI (Mobile Industry Processor Interface) alliance. SLIMbus is a 2-wire implementation, which is used to communicate with peripheral components like audio-codec. SLIMbus uses Time-Division-Multiplexing to accommodate multiple data channels, and control channel. Control channel has messages to do device-enumeration, messages to send/receive control-data to/from slimbus devices, messages for port/channel management, and messages to do bandwidth allocation. Framework is introduced to support multiple instances of the bus (1 controller per bus), and multiple slave devices per controller. SPI and I2C frameworks, and comments from last time when I submitted the patches were referred-to while working on this framework.
These patchsets introduce device-management, OF helpers, and messaging APIs, controller driver for Qualcomm's slimbus controller, and clock-pause feature for entering/exiting low-power mode for SLIMbus. Framework patches to do channel, port and bandwidth management are work-in-progress and will be sent out once these initial patches are accepted.
These patchsets were tested on Qualcomm Snapdragon processor board using the controller driver, and a test slave device.
v6: https://lwn.net/Articles/735693/
Changes from v6 to v7: * Various improvements in commenting style and kerneldoc suggested by various reviewers. * Removed usage of semaphores. * Split patches into more reviewable sizes. * Move buffer management into the controller driver. * use IDR for TID transactions. * use IDA for controller ids. * Remove lot of redundant code. * remove framer booted call for now, which can be added in future. * Added slim_readb/writeb and slim_read/write apis for simplified value element interface. Inspired by Soundwire patches. * Added slim device state so the the drivers which are probed after the device is announced, can get device state. * Lots of code cleanup. * move summary to .rst format. * move from callbacks to completions for async reads. * split slimbus.h into device and controller specific parts.
Sagar Dharia (9): Documentation: Add SLIMbus summary dt-bindings: Add SLIMbus bindings slimbus: Add SLIMbus bus type slimbus: core: Add slim controllers support slimbus: Add messaging APIs to slimbus framework slimbus: Add support for 'clock-pause' feature dt-bindings: Add qcom slimbus controller bindings slimbus: qcom: Add Qualcomm Slimbus controller driver slimbus: qcom: Add runtime-pm support using clock-pause
Srinivas Kandagatla (4): slimbus: core: add support to device tree helper regmap: add SLIMbus support slimbus: core: add common defines required for controllers MAINTAINERS: Add SLIMbus maintainer
Documentation/devicetree/bindings/slimbus/bus.txt | 50 ++ .../devicetree/bindings/slimbus/slim-qcom-ctrl.txt | 43 ++ Documentation/driver-api/slimbus/index.rst | 15 + Documentation/driver-api/slimbus/summary.rst | 108 +++ MAINTAINERS | 8 + drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/base/regmap/Kconfig | 4 + drivers/base/regmap/Makefile | 1 + drivers/base/regmap/regmap-slimbus.c | 95 +++ drivers/slimbus/Kconfig | 22 + drivers/slimbus/Makefile | 9 + drivers/slimbus/core.c | 500 +++++++++++++ drivers/slimbus/messaging.c | 448 ++++++++++++ drivers/slimbus/qcom-ctrl.c | 791 +++++++++++++++++++++ drivers/slimbus/sched.c | 128 ++++ drivers/slimbus/slimbus.h | 276 +++++++ include/linux/mod_devicetable.h | 13 + include/linux/regmap.h | 18 + include/linux/slimbus.h | 167 +++++ 20 files changed, 2699 insertions(+) create mode 100644 Documentation/devicetree/bindings/slimbus/bus.txt create mode 100644 Documentation/devicetree/bindings/slimbus/slim-qcom-ctrl.txt create mode 100644 Documentation/driver-api/slimbus/index.rst create mode 100644 Documentation/driver-api/slimbus/summary.rst create mode 100644 drivers/base/regmap/regmap-slimbus.c create mode 100644 drivers/slimbus/Kconfig create mode 100644 drivers/slimbus/Makefile create mode 100644 drivers/slimbus/core.c create mode 100644 drivers/slimbus/messaging.c create mode 100644 drivers/slimbus/qcom-ctrl.c create mode 100644 drivers/slimbus/sched.c create mode 100644 drivers/slimbus/slimbus.h create mode 100644 include/linux/slimbus.h