Hi all, Let me begin admitting that we are introducing yet another protocol to achieve same things as many existing protocols like ARM SCPI, TI SCI, QCOM RPM, Nvidia Tegra BPMP, and so on. All I can say is that this new ARM System Control and Management Interface(SCMI) is more flexible and easily extensible than any of the existing ones. Many vendors were involved in the making of this formal specification and is now officially published[1]. There is a strong trend in the industry to provide micro-controllers in systems to abstract various power, or other system management tasks. These controllers usually have similar interfaces, both in terms of the functions that are provided by them, and in terms of how requests are communicated to them. This specification is to standardise and avoid (any further) fragmentation in the design of such interface by various vendors. This patch set is intended to get feedback on the design and structure of the code. This is not complete and not fully tested due to non-availability of firmware with full feature set at this time. It currently doesn't support notification, asynchronous/delayed response, perf/power statistics region and sensor register region to name a few. I have borrowed some of the ideas of message allocation/management from TI SCI. Changes: v2[4]->v3: - Addressed various comments recieved so far(clock, hwmon and cpufreq drivers along with scmi drivers) - Hwmon driver now uses core layer to create and manage sysfs attributes - Added a shim layer to abstract the mailbox interface to support any custom adaptation required by the controller driver - Simple ARM MHU shim layer using newly added abstraction v1[3]->v2[4]: - Additional support for polling based DVFS and per protocol channels - Dependent drivers(clock, hwmon, cpufreq and power domains) - Various other review comments and issued found during testing addressed - Explicit binding for method dropped as even SMC based method are adviertised as mailbox RFC[2]->v1[3]: - Add generic mailbox binding for shared memory(Rob H) - Dropped compatibles per protocol(Suggested by Matt S) - Dropped lot of unnecessary pointer casting(Arnd B) - Dropped packing of structures(Arnd B) - Few other changes/additions based initial testing with firmware providing SCMI interface to OSPM -- Regards, Sudeep [1] http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/index.html [2] https://marc.info/?l=linux-kernel&m=149685193627620&w=2 [3] https://marc.info/?l=linux-arm-kernel&m=149849482623492&w=2 [4] https://marc.info/?l=devicetree&m=150185763105926&w=2 Sudeep Holla (22): dt-bindings: mailbox: add support for mailbox client shared memory dt-bindings: arm: add support for ARM System Control and Management Interface(SCMI) protocol dt-bindings: arm: scmi: add ARM MHU specific mailbox client bindings firmware: arm_scmi: add basic driver infrastructure for SCMI firmware: arm_scmi: add common infrastructure and support for base protocol firmware: arm_scmi: add initial support for performance protocol firmware: arm_scmi: add initial support for clock protocol firmware: arm_scmi: add initial support for power protocol firmware: arm_scmi: add initial support for sensor protocol firmware: arm_scmi: probe and initialise all the supported protocols firmware: arm_scmi: add support for polling based SCMI transfers firmware: arm_scmi: add option for polling based performance domain operations firmware: arm_scmi: refactor in preparation to support per-protocol channels firmware: arm_scmi: add per-protocol channels support using idr objects firmware: arm_scmi: abstract mailbox interface firmware: arm_scmi: add arm_mhu specific mailbox interface firmware: arm_scmi: add device power domain support using genpd clk: add support for clocks provided by SCMI hwmon: (core) Add hwmon_max to hwmon_sensor_types enumeration hwmon: add support for sensors exported via ARM SCMI cpufreq: add support for CPU DVFS based on SCMI message protocol cpufreq: scmi: add support for fast frequency switching .../devicetree/bindings/arm/arm,mhu-scmi.txt | 19 + Documentation/devicetree/bindings/arm/arm,scmi.txt | 171 ++++ .../devicetree/bindings/mailbox/mailbox.txt | 28 + MAINTAINERS | 11 +- drivers/clk/Kconfig | 10 + drivers/clk/Makefile | 1 + drivers/clk/clk-scmi.c | 210 +++++ drivers/cpufreq/Kconfig.arm | 11 + drivers/cpufreq/Makefile | 1 + drivers/cpufreq/scmi-cpufreq.c | 287 +++++++ drivers/firmware/Kconfig | 34 + drivers/firmware/Makefile | 1 + drivers/firmware/arm_scmi/Makefile | 4 + drivers/firmware/arm_scmi/arm_mhu_if.c | 106 +++ drivers/firmware/arm_scmi/base.c | 293 +++++++ drivers/firmware/arm_scmi/clock.c | 339 ++++++++ drivers/firmware/arm_scmi/common.h | 127 +++ drivers/firmware/arm_scmi/driver.c | 956 +++++++++++++++++++++ drivers/firmware/arm_scmi/mbox_if.c | 80 ++ drivers/firmware/arm_scmi/mbox_if.h | 71 ++ drivers/firmware/arm_scmi/perf.c | 514 +++++++++++ drivers/firmware/arm_scmi/power.c | 242 ++++++ drivers/firmware/arm_scmi/scmi_pm_domain.c | 134 +++ drivers/firmware/arm_scmi/sensors.c | 287 +++++++ drivers/hwmon/Kconfig | 12 + drivers/hwmon/Makefile | 1 + drivers/hwmon/scmi-hwmon.c | 235 +++++ include/linux/hwmon.h | 1 + include/linux/scmi_protocol.h | 216 +++++ 29 files changed, 4397 insertions(+), 5 deletions(-) create mode 100644 Documentation/devicetree/bindings/arm/arm,mhu-scmi.txt create mode 100644 Documentation/devicetree/bindings/arm/arm,scmi.txt create mode 100644 drivers/clk/clk-scmi.c create mode 100644 drivers/cpufreq/scmi-cpufreq.c create mode 100644 drivers/firmware/arm_scmi/Makefile create mode 100644 drivers/firmware/arm_scmi/arm_mhu_if.c create mode 100644 drivers/firmware/arm_scmi/base.c create mode 100644 drivers/firmware/arm_scmi/clock.c create mode 100644 drivers/firmware/arm_scmi/common.h create mode 100644 drivers/firmware/arm_scmi/driver.c create mode 100644 drivers/firmware/arm_scmi/mbox_if.c create mode 100644 drivers/firmware/arm_scmi/mbox_if.h create mode 100644 drivers/firmware/arm_scmi/perf.c create mode 100644 drivers/firmware/arm_scmi/power.c create mode 100644 drivers/firmware/arm_scmi/scmi_pm_domain.c create mode 100644 drivers/firmware/arm_scmi/sensors.c create mode 100644 drivers/hwmon/scmi-hwmon.c create mode 100644 include/linux/scmi_protocol.h -- 2.7.4 -- To unsubscribe from 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