Re: [PATCH v3 0/6] Introduce STM32 system bus

[Gatien CHEVALLIER <gatien.chevallier@foss.st.com>]

Hello all,

I'm abandoning this series for:
https://lore.kernel.org/lkml/20230705172759.1610753

Sorry for the noise.

Best regards,
Gatien

On 1/27/23 17:40, Gatien Chevallier wrote:
> 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
> 
> Changes in V3:
> 	- Document feature-domains property in YAML documentation for
> 	concerned periperals under the System Bus
> 	- Fix STM32 System Bus YAML documentation
> 	- Remove STM32 System bus bindings that were currently used
> 	as helpers for device tree
> 	- Correct few errors in driver
> 	- Add missing peripherals under the System Bus that were in
> 	SoC variation device tree files
> 	- Fix node names
> 
> Gatien Chevallier (5):
>    dt-bindings: treewide: add feature-domains description in binding
>      files
>    dt-bindings: bus: add STM32 System Bus
>    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   |  127 +
>   .../bindings/crypto/st,stm32-hash.yaml        |    5 +
>   .../devicetree/bindings/dma/st,stm32-dma.yaml |    5 +
>   .../bindings/dma/st,stm32-dmamux.yaml         |    5 +
>   .../feature-domain-controller.yaml            |   84 +
>   .../devicetree/bindings/i2c/st,stm32-i2c.yaml |    5 +
>   .../bindings/iio/adc/st,stm32-adc.yaml        |    5 +
>   .../bindings/iio/adc/st,stm32-dfsdm-adc.yaml  |    5 +
>   .../bindings/iio/dac/st,stm32-dac.yaml        |    5 +
>   .../bindings/media/st,stm32-cec.yaml          |    5 +
>   .../bindings/media/st,stm32-dcmi.yaml         |    5 +
>   .../memory-controllers/st,stm32-fmc2-ebi.yaml |    5 +
>   .../bindings/mfd/st,stm32-lptimer.yaml        |    5 +
>   .../bindings/mfd/st,stm32-timers.yaml         |    6 +
>   .../devicetree/bindings/mmc/arm,pl18x.yaml    |    5 +
>   .../devicetree/bindings/net/stm32-dwmac.yaml  |    5 +
>   .../bindings/phy/phy-stm32-usbphyc.yaml       |    5 +
>   .../bindings/regulator/st,stm32-vrefbuf.yaml  |    5 +
>   .../devicetree/bindings/rng/st,stm32-rng.yaml |    5 +
>   .../bindings/serial/st,stm32-uart.yaml        |    5 +
>   .../bindings/sound/st,stm32-i2s.yaml          |    5 +
>   .../bindings/sound/st,stm32-sai.yaml          |    5 +
>   .../bindings/sound/st,stm32-spdifrx.yaml      |    5 +
>   .../bindings/spi/st,stm32-qspi.yaml           |    5 +
>   .../devicetree/bindings/spi/st,stm32-spi.yaml |    5 +
>   .../devicetree/bindings/usb/dwc2.yaml         |    5 +
>   MAINTAINERS                                   |    6 +
>   arch/arm/boot/dts/stm32mp131.dtsi             |  407 +--
>   arch/arm/boot/dts/stm32mp133.dtsi             |   51 +-
>   arch/arm/boot/dts/stm32mp13xc.dtsi            |   19 +-
>   arch/arm/boot/dts/stm32mp13xf.dtsi            |   18 +-
>   arch/arm/boot/dts/stm32mp151.dtsi             | 2722 +++++++++--------
>   arch/arm/boot/dts/stm32mp153.dtsi             |   52 +-
>   arch/arm/boot/dts/stm32mp15xc.dtsi            |   19 +-
>   drivers/bus/Kconfig                           |    9 +
>   drivers/bus/Makefile                          |    1 +
>   drivers/bus/stm32_sys_bus.c                   |  168 +
>   37 files changed, 2208 insertions(+), 1596 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
>