feature-domains is an optional property that allows a peripheral to
refer to one or more feature domain controller(s).

Description of this property is added to all peripheral binding files of
the peripheral under the STM32 firewall controllers. It allows an accurate
representation of the hardware, where various peripherals are connected
to this firewall bus. The firewall can then check the peripheral accesses
before allowing it to probe.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
---

Disclaimer: Some error with dtbs_check will be observed as I've
considered the property to be generic, as Rob asked

 Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml  | 4 ++++
 Documentation/devicetree/bindings/dma/st,stm32-dma.yaml      | 4 ++++
 Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml   | 4 ++++
 Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml      | 4 ++++
 Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml  | 4 ++++
 .../devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml      | 4 ++++
 Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml  | 4 ++++
 .../devicetree/bindings/media/cec/st,stm32-cec.yaml          | 4 ++++
 Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml   | 4 ++++
 .../bindings/memory-controllers/st,stm32-fmc2-ebi.yaml       | 4 ++++
 Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml  | 4 ++++
 Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml   | 5 +++++
 Documentation/devicetree/bindings/mmc/arm,pl18x.yaml         | 4 ++++
 Documentation/devicetree/bindings/net/stm32-dwmac.yaml       | 4 ++++
 Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 4 ++++
 .../devicetree/bindings/regulator/st,stm32-vrefbuf.yaml      | 4 ++++
 Documentation/devicetree/bindings/rng/st,stm32-rng.yaml      | 4 ++++
 Documentation/devicetree/bindings/serial/st,stm32-uart.yaml  | 4 ++++
 Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml    | 4 ++++
 Documentation/devicetree/bindings/sound/st,stm32-sai.yaml    | 4 ++++
 .../devicetree/bindings/sound/st,stm32-spdifrx.yaml          | 4 ++++
 Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml     | 4 ++++
 Documentation/devicetree/bindings/spi/st,stm32-spi.yaml      | 4 ++++
 Documentation/devicetree/bindings/usb/dwc2.yaml              | 4 ++++
 24 files changed, 97 insertions(+)

diff --git a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
index b767ec72a999..daf8dcaef627 100644
--- a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
+++ b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml

@@ -50,6 +50,10 @@ properties:
   power-domains:
     maxItems: 1
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3