[v7,0/3] Add support for SCMI-Regulator

Hi,

this series introduces the support for a new generic SCMI Regulator driver
developed on top of the recently introduced SCMI Voltage Domain Protocol
support as specified in the upcoming SCMIv3.0 specification. [1]

The underlying SCMI VD Protocol support, which was originally part of this
series, is now applied on for-next/scmi-voltage [2], and this series,
reduced to its SCMI Regulator support and dt-bindings fixes is similarly
based on top of [2]:

commit ec8838193695 ("firmware: arm_scmi: Add support to enumerated SCMI
		      voltage domain device")

Thanks,

Cristian

---
v6 --> v7
- rebased on top of for-next/scmi-voltage
- added dt-bindings fix to remove optional properties
- add proper blank lines between semantic blocks
- fix return value on error path of scmi_reg_is_enabled()
- use generic Failure message on err path of info_get()
- fix comment containing apostrophe

v5 --> v6
- reordered dt bindings patch
- removed single field struct
- reviewed args to scmi_init_voltage_levels()
- allocating scmi_voltage_info_array contiguously

v4 --> v5
- rebased
- VD Protocol
 - removed inline
 - moved segmented intervals defines
 - fixed some macros complaints by checkpatch

v3 --> v4
- DT bindings
 - using generic node names
 - listing explicitly subset of supported regulators bindings
- SCMI Regulator
 - using of_match_full_name core regulator flag
 - avoid coccinelle false flag complaints
- VD Protocol
 - avoid coccinelle false flag complaints
 - avoiding fixed size typing

v2 --> v3
- DT bindings
  - avoid awkard examples based on _cpu/_gpu regulators
- SCMI Regulator
  - remove multiple linear mappings support
  - removed duplicated voltage name printout
  - added a few comments
  - simplified return path in scmi_reg_set_voltage_sel()
- VD Protocol
  - restrict segmented voltage domain descriptors to one triplet
  - removed unneeded inline
  - free allocated resources for invalid voltage domain
  - added __must_check to info_get voltage operations
  - added a few comments
  - removed fixed size typing from struct voltage_info
    
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.holla/linux.git/log/?h=for-next/scmi-voltage

Cristian Marussi (3):
  dt-bindings: arm: remove optional properties for SCMI Regulators
  regulator: core: add of_match_full_name boolean flag
  regulator: add SCMI driver

 .../devicetree/bindings/arm/arm,scmi.txt      |  11 +-
 drivers/regulator/Kconfig                     |   9 +
 drivers/regulator/Makefile                    |   1 +
 drivers/regulator/of_regulator.c              |   8 +-
 drivers/regulator/scmi-regulator.c            | 417 ++++++++++++++++++
 include/linux/regulator/driver.h              |   3 +
 6 files changed, 437 insertions(+), 12 deletions(-)
 create mode 100644 drivers/regulator/scmi-regulator.c