[PATCH 0/8] ARM: STM32: add art-pi(stm32h750xbh6) board support

[dillon . minfei]

From: dillon min <dillon.minfei@xxxxxxxxx>

This patchset intend to add art-pi board support, this board developed
by rt-thread(https://www.rt-thread.org/).

Board resources:

8MiB QSPI flash
16MiB SPI flash
32MiB SDRAM
AP6212 wifi,bt,fm comb

sw context:
- as stm32h750 just has 128k bytes internal flash, so running a fw on
  internal flash to download u-boot/kernel to qspi flash, boot
  u-boot/kernel from qspi flash. this fw is based on rt-thread.
- kernel can be xip on qspi flash or load to sdram
- root filesystem is jffs2(created by buildroot), stored on spi flash

to support the boad, add following changes.
- fix r0-r3, r12 register restore failed after svc call, 
- add dts binding
- update yaml doc

dillon min (8):
  ARM: ARMv7-M: Fix register restore corrupt after svc call
  Documentation: arm: stm32: Add stm32h750 value line
  dt-bindings: arm: stm32: Add compatible strings for ART-PI board
  dt-bindings: pinctrl: stm32: Add stm32h750 pinctrl
  ARM: dts: stm32: introduce stm32h7-pinctrl.dtsi to support stm32h75x
  ARM: dts: stm32: add stm32h750-pinctrl.dtsi
  ARM: dts: stm32: add support for art-pi board based on stm32h750xbh6
  ARM: stm32: add initial support for stm32h750

 Documentation/arm/index.rst                        |   1 +
 Documentation/arm/stm32/stm32h750-overview.rst     |  33 ++
 .../devicetree/bindings/arm/stm32/stm32.yaml       |   4 +
 .../bindings/pinctrl/st,stm32-pinctrl.yaml         |   1 +
 arch/arm/boot/dts/Makefile                         |   1 +
 arch/arm/boot/dts/stm32h7-pinctrl.dtsi             | 392 +++++++++++++++++++++
 arch/arm/boot/dts/stm32h743-pinctrl.dtsi           | 307 +---------------
 arch/arm/boot/dts/stm32h743.dtsi                   |  30 ++
 arch/arm/boot/dts/stm32h750-pinctrl.dtsi           |  11 +
 arch/arm/boot/dts/stm32h750.dtsi                   |   5 +
 arch/arm/boot/dts/stm32h750i-art-pi.dts            | 227 ++++++++++++
 arch/arm/mach-stm32/board-dt.c                     |   1 +
 arch/arm/mm/proc-v7m.S                             |   5 +-
 13 files changed, 716 insertions(+), 302 deletions(-)
 create mode 100644 Documentation/arm/stm32/stm32h750-overview.rst
 create mode 100644 arch/arm/boot/dts/stm32h7-pinctrl.dtsi
 create mode 100644 arch/arm/boot/dts/stm32h750-pinctrl.dtsi
 create mode 100644 arch/arm/boot/dts/stm32h750.dtsi
 create mode 100644 arch/arm/boot/dts/stm32h750i-art-pi.dts

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2.7.4