[PATCH 03/10] dt-bindings: bus: add device tree bindings for ETZPC

[Gatien Chevallier <gatien.chevallier@xxxxxxxxxxx>]

Document ETZPC (Extended TrustZone protection controller). ETZPC is a
firewall controller.

Signed-off-by: Gatien Chevallier <gatien.chevallier@xxxxxxxxxxx>
---
 .../bindings/bus/st,stm32-etzpc.yaml          | 90 +++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/bus/st,stm32-etzpc.yaml

diff --git a/Documentation/devicetree/bindings/bus/st,stm32-etzpc.yaml b/Documentation/devicetree/bindings/bus/st,stm32-etzpc.yaml
new file mode 100644
index 000000000000..327fb0b84c0b
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/st,stm32-etzpc.yaml
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bus/st,stm32-etzpc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STM32 Extended TrustZone protection controller bindings
+
+description: |
+  The ETZPC configures TrustZone security in a SoC having bus masters and
+  devices with programmable-security attributes (securable resources).
+
+maintainers:
+  - Gatien Chevallier <gatien.chevallier@xxxxxxxxxxx>
+
+properties:
+  compatible:
+    const: "st,stm32-etzpc"
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  feature-domain-controller: true
+
+patternProperties:
+  "^.*@[0-9a-f]+$":
+    description: Peripherals
+    type: object
+    properties:
+      feature-domains:
+        minItems: 1
+        maxItems: 2
+        description:
+          The first argument must always be a phandle that references to the
+          firewall controller of the peripheral. The second can contain the
+          platform specific firewall ID of the peripheral.
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+  - feature-domain-controller
+  - "#feature-domain-cells"
+  - ranges
+
+additionalProperties: false
+
+examples:
+  - |
+    // In this example, the usart2 device refers to rifsc as its domain
+    // controller.
+    // Access rights are verified before creating devices.
+
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/stm32mp13-clks.h>
+    #include <dt-bindings/reset/stm32mp13-resets.h>
+
+    etzpc: etzpc@5c007000 {
+        compatible = "st,stm32mp13-sys-bus";
+        reg = <0x5c007000 0x400>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges;
+        feature-domain-controller;
+        #feature-domain-cells = <1>;
+
+        usart2: serial@4c001000 {
+          compatible = "st,stm32h7-uart";
+          reg = <0x4c001000 0x400>;
+          interrupts-extended = <&exti 27 IRQ_TYPE_LEVEL_HIGH>;
+          clocks = <&rcc USART2_K>;
+          resets = <&rcc USART2_R>;
+          wakeup-source;
+          dmas = <&dmamux1 43 0x400 0x5>,
+                 <&dmamux1 44 0x400 0x1>;
+          dma-names = "rx", "tx";
+          feature-domains = <&etzpc 17>;
+          status = "disabled";
+        };
+    };
-- 
2.25.1