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dt-bindings: bus: document ETZPC
Document ETZPC (Extended TrustZone protection controller). ETZPC is a firewall controller. Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
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Documentation/devicetree/bindings/bus/st,stm32-etzpc.yaml
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Documentation/devicetree/bindings/bus/st,stm32-etzpc.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/bus/st,stm32-etzpc.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: STM32 Extended TrustZone protection controller
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description: |
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The ETZPC configures TrustZone security in a SoC having bus masters and
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devices with programmable-security attributes (securable resources).
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maintainers:
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- Gatien Chevallier <gatien.chevallier@foss.st.com>
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select:
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properties:
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compatible:
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contains:
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const: st,stm32-etzpc
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required:
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- compatible
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properties:
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compatible:
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items:
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- const: st,stm32-etzpc
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- const: simple-bus
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reg:
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maxItems: 1
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"#address-cells":
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const: 1
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"#size-cells":
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const: 1
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ranges: true
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"#access-controller-cells":
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const: 1
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description:
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Contains the firewall ID associated to the peripheral.
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patternProperties:
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"^.*@[0-9a-f]+$":
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description: Peripherals
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type: object
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additionalProperties: true
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required:
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- access-controllers
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required:
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- compatible
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- reg
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- "#address-cells"
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- "#size-cells"
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- "#access-controller-cells"
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- ranges
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additionalProperties: false
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examples:
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- |
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// In this example, the usart2 device refers to rifsc as its access
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// controller.
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// Access rights are verified before creating devices.
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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#include <dt-bindings/clock/stm32mp13-clks.h>
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#include <dt-bindings/reset/stm32mp13-resets.h>
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etzpc: bus@5c007000 {
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compatible = "st,stm32-etzpc", "simple-bus";
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reg = <0x5c007000 0x400>;
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#address-cells = <1>;
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#size-cells = <1>;
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#access-controller-cells = <1>;
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ranges;
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usart2: serial@4c001000 {
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compatible = "st,stm32h7-uart";
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reg = <0x4c001000 0x400>;
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interrupts-extended = <&exti 27 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&rcc USART2_K>;
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resets = <&rcc USART2_R>;
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wakeup-source;
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dmas = <&dmamux1 43 0x400 0x5>,
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<&dmamux1 44 0x400 0x1>;
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dma-names = "rx", "tx";
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access-controllers = <&etzpc 17>;
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};
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};
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