Document STM32 System Bus. This bus is intended to control firewall access for the peripherals connected to it. For every peripheral, the bus checks the firewall registers to see if the peripheral is configured as non-secure. If the peripheral is configured as secure, the node is marked populated, so the device won't be probed. This is useful as a firewall configuration sanity check and avoid platform crashes in case peripherals are incorrectly configured. The STM32 System Bus implements the feature-domain-controller bindings. It is used by peripherals to reference a domain controller, in this case the firewall feature domain. The bus uses the ID referenced by the feature-domains property to know where to look in the firewall to get the security configuration for the peripheral. This allows a device tree description rather than a hardcoded peripheral table in the bus driver. On STM32MP13/15 platforms, the firewall bus is represented by the ETZPC node, which is responsible for the securing / MCU isolating the capable peripherals. STM32MP13/15 device trees are updated in this series to implement the bus. All peripherals that are securable or MCU isolation capable by the ETZPC are connected to the bus. Changes in V2: - Corrected YAMLS errors highlighted by Rob's robot - Re-ordered Signed-off-by tags in two patches Gatien Chevallier (6): dt-bindings: bus: add STM32 System Bus dt-bindings: bus: add STM32MP15 ETZPC firewall bus bindings dt-bindings: bus: add STM32MP13 ETZPC firewall bus bindings bus: stm32_sys_bus: add support for STM32MP15 and STM32MP13 system bus ARM: dts: stm32: add ETZPC as a system bus for STM32MP15x boards ARM: dts: stm32: add ETZPC as a system bus for STM32MP13x boards Oleksii Moisieiev (1): dt-bindings: Document common device controller bindings .../devicetree/bindings/bus/st,sys-bus.yaml | 88 + .../feature-domain-controller.yaml | 84 + MAINTAINERS | 6 + arch/arm/boot/dts/stm32mp131.dtsi | 242 +- arch/arm/boot/dts/stm32mp151.dtsi | 2737 +++++++++-------- drivers/bus/Kconfig | 9 + drivers/bus/Makefile | 1 + drivers/bus/stm32_sys_bus.c | 180 ++ include/dt-bindings/bus/stm32mp13_sys_bus.h | 60 + include/dt-bindings/bus/stm32mp15_sys_bus.h | 98 + 10 files changed, 2062 insertions(+), 1443 deletions(-) create mode 100644 Documentation/devicetree/bindings/bus/st,sys-bus.yaml create mode 100644 Documentation/devicetree/bindings/feature-controllers/feature-domain-controller.yaml create mode 100644 drivers/bus/stm32_sys_bus.c create mode 100644 include/dt-bindings/bus/stm32mp13_sys_bus.h create mode 100644 include/dt-bindings/bus/stm32mp15_sys_bus.h -- 2.25.1
