[PATCH v3 0/4] stm32mp15: update remoteproc to support SCMI Device tree

[Arnaud Pouliquen]

Update vs V2[1]:
---------------
- update yaml to remove label in examples
- fix error management for  devm_reset_control_get_optional(dev, "hold_boot")
- rebased on commit ac9a78681b92 ("Linux 6.4-rc1")

[1]https://lore.kernel.org/lkml/20230504094641.870378-1-arnaud.pouliquen@foss.st.com/T/


Description:
-----------
This series updates the stm32_rproc driver and associated DT node to
support device tree configuration with and without SCMI server. 
The impact is mainly on the MCU hold boot management.

Three configurations have to be supported:

1) Configuration without OP-TEE SCMI (legacy): Trusted context not activated
- The MCU reset is controlled through the Linux RCC reset driver.
- The MCU HOLD BOOT is controlled through The RCC sysconf.

2) Configuration with SCMI server: Trusted context activated
- The MCU reset is controlled through the SCMI reset service.
- The MCU HOLD BOOT is no more controlled through a SMC call service but
  through the SCMI reset service.

3) Configuration with OP-TEE SMC call (deprecated): Trusted context activated
- The MCU reset is controlled through the Linux RCC reset driver.
- The MCU HOLD BOOT is controlled through The SMC call.

In consequence this series:
- adds the use of the SCMI reset service to manage the MCU hold boot,
- determines the configuration to use depending on the presence of the
  "reset-names" property
  if ( "reset-names" property contains "hold_boot")
  then use reset_control services
  else use regmap access based on "st,syscfg-holdboot" property.
- set the DT st,syscfg-tz property as deprecated

Arnaud Pouliquen (4):
  dt-bindings: remoteproc: st,stm32-rproc: Rework reset declarations
  remoteproc: stm32: Allow hold boot management by the SCMI reset
    controller
  ARM: dts: stm32: Update reset declarations
  ARM: dts: stm32: fix m4_rproc references to use SCMI

 .../bindings/remoteproc/st,stm32-rproc.yaml   | 44 +++++++++--
 arch/arm/boot/dts/stm32mp151.dtsi             |  2 +-
 arch/arm/boot/dts/stm32mp157a-dk1-scmi.dts    |  6 +-
 arch/arm/boot/dts/stm32mp157c-dk2-scmi.dts    |  6 +-
 arch/arm/boot/dts/stm32mp157c-ed1-scmi.dts    |  6 +-
 arch/arm/boot/dts/stm32mp157c-ev1-scmi.dts    |  6 +-
 drivers/remoteproc/stm32_rproc.c              | 76 ++++++++++++++-----
 7 files changed, 111 insertions(+), 35 deletions(-)

-- 
2.25.1