Add support for SCMIv3.0 Voltage Domain Protocol and SCMI-Regulator [LWN.net]

From:		Cristian Marussi <cristian.marussi-AT-arm.com>
To:		linux-kernel-AT-vger.kernel.org, linux-arm-kernel-AT-lists.infradead.org
Subject:		[PATCH v2 0/4] Add support for SCMIv3.0 Voltage Domain Protocol and SCMI-Regulator
Date:		Thu, 15 Oct 2020 16:39:57 +0100
Message-ID:		<20201015154001.8931-1-cristian.marussi@arm.com>
Cc:		sudeep.holla-AT-arm.com, lukasz.luba-AT-arm.com, james.quinlan-AT-broadcom.com, Jonathan.Cameron-AT-Huawei.com, broonie-AT-kernel.org, robh-AT-kernel.org, satyakim-AT-qti.qualcomm.com, etienne.carriere-AT-linaro.org, f.fainelli-AT-gmail.com, vincent.guittot-AT-linaro.org, souvik.chakravarty-AT-arm.com, cristian.marussi-AT-arm.com
Archive-link:		Article

Hi,

this series introduces the support for the new SCMI Voltage Domain Protocol
defined by the upcoming SCMIv3.0 specification, whose BETA release is
available at [1].

Afterwards, a new generic SCMI Regulator driver is developed on top of the
new SCMI VD Protocol.

The series is currently based on for-next/scmi [2] on top of:

commit fd7c58ee3026 ("firmware: arm_scmi: Fix locking in notifications")

Any feedback welcome,

Thanks,

Cristian

---
v1 --> v2
- rebased on for-next/scmi v5.10
- DT bindings
  - removed any reference to negative voltages
- SCMI Regulator
  - removed duplicate regulator naming
  - removed redundant .get/set_voltage ops: only _sel variants implemented
  - removed condexpr on fail path to increase readability
- VD Protocol
  - fix voltage levels query loop to reload full cmd description
    between iterations as reported by Etienne Carriere
  - ensure transport rx buffer is properly sized calli scmi_reset_rx_to_maxsz
    between transfers

[1]:https://developer.arm.com/documentation/den0056/c/
[2]:https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.ho...

Cristian Marussi (4):
  firmware: arm_scmi: Add Voltage Domain Support
  firmware: arm_scmi: add SCMI Voltage Domain devname
  regulator: add SCMI driver
  dt-bindings: arm: add support for SCMI Regulators

 .../devicetree/bindings/arm/arm,scmi.txt      |  42 ++
 drivers/firmware/arm_scmi/Makefile            |   2 +-
 drivers/firmware/arm_scmi/common.h            |   1 +
 drivers/firmware/arm_scmi/driver.c            |   3 +
 drivers/firmware/arm_scmi/voltage.c           | 382 +++++++++++++++
 drivers/regulator/Kconfig                     |   9 +
 drivers/regulator/Makefile                    |   1 +
 drivers/regulator/scmi-regulator.c            | 453 ++++++++++++++++++
 include/linux/scmi_protocol.h                 |  64 +++
 9 files changed, 956 insertions(+), 1 deletion(-)
 create mode 100644 drivers/firmware/arm_scmi/voltage.c
 create mode 100644 drivers/regulator/scmi-regulator.c

-- 
2.17.1