[v3,04/11] dt-bindings: bus: document ETZPC

Commit Message

Gatien CHEVALLIER July 26, 2023, 9:01 a.m. UTC

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

Signed-off-by: Gatien Chevallier <[e-mail]>
---

Changes in V2: 
	- Corrected errors highlighted by Rob's robot
	- No longer define the maxItems for the "feature-domains"
	  property
	- Fix example (node name, status)
	- Declare "feature-domain-names" as an optional
	  property for child nodes
	- Fix description of "feature-domains" property
	- Reorder the properties so it matches RIFSC
	- Add missing "feature-domain-controller" property

 .../bindings/bus/st,stm32-etzpc.yaml          | 96 +++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/bus/st,stm32-etzpc.yaml

Comments

Rob Herring (Arm) July 26, 2023, 11:32 a.m. UTC | #1

On Wed, 26 Jul 2023 11:01:22 +0200, Gatien Chevallier wrote:
> Document ETZPC (Extended TrustZone protection controller). ETZPC is a
> firewall controller.
> 
> Signed-off-by: Gatien Chevallier <[e-mail]>
> ---
> 
> Changes in V2:
> 	- Corrected errors highlighted by Rob's robot
> 	- No longer define the maxItems for the "feature-domains"
> 	  property
> 	- Fix example (node name, status)
> 	- Declare "feature-domain-names" as an optional
> 	  property for child nodes
> 	- Fix description of "feature-domains" property
> 	- Reorder the properties so it matches RIFSC
> 	- Add missing "feature-domain-controller" property
> 
>  .../bindings/bus/st,stm32-etzpc.yaml          | 96 +++++++++++++++++++
>  1 file changed, 96 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/bus/st,stm32-etzpc.yaml
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/bus/st,stm32-etzpc.example.dtb: serial@4c001000: Unevaluated properties are not allowed ('feature-domains' was unexpected)
	from schema $id: http://devicetree.org/schemas/serial/st,stm32-uart.yaml#

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/[e-mail]

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.

Patch

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..ef5979c0d6f2
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/st,stm32-etzpc.yaml
@@ -0,0 +1,96 @@ 
+# 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
+
+description: |
+  The ETZPC configures TrustZone security in a SoC having bus masters and
+  devices with programmable-security attributes (securable resources).
+
+maintainers:
+  - Gatien Chevallier <[e-mail]>
+
+properties:
+  compatible:
+    contains:
+      const: st,stm32-etzpc
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  ranges: true
+
+  "#feature-domain-cells":
+    const: 1
+
+  feature-domain-controller: true
+
+patternProperties:
+  "^.*@[0-9a-f]+$":
+    description: Peripherals
+    type: object
+    properties:
+      feature-domains:
+        minItems: 1
+        description:
+          The phandle of the firewall controller of the peripheral and the
+          platform-specific firewall ID of the peripheral.
+
+      feature-domain-names:
+        minItems: 1
+
+    required:
+      - feature-domains
+
+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: bus@5c007000 {
+        compatible = "st,stm32-etzpc";
+        reg = <0x5c007000 0x400>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+        feature-domain-controller;
+        #feature-domain-cells = <1>;
+        ranges;
+
+        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>;
+        };
+    };