linux-kernel - Re: [PATCH v8 04/13] dt-bindings: bus: document ETZPC

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Date: Thu, 21 Dec 2023 16:00:49 -0600
From: Rob Herring <robh@...nel.org>
To: Gatien Chevallier <gatien.chevallier@...s.st.com>
Cc: Oleksii_Moisieiev@...m.com, gregkh@...uxfoundation.org,
	herbert@...dor.apana.org.au, davem@...emloft.net,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	alexandre.torgue@...s.st.com, vkoul@...nel.org, jic23@...nel.org,
	olivier.moysan@...s.st.com, arnaud.pouliquen@...s.st.com,
	mchehab@...nel.org, fabrice.gasnier@...s.st.com,
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	linux-spi@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v8 04/13] dt-bindings: bus: document ETZPC

On Tue, Dec 12, 2023 at 04:23:47PM +0100, Gatien Chevallier wrote:
> Document ETZPC (Extended TrustZone protection controller). ETZPC is a
> firewall controller.
> 
> Signed-off-by: Gatien Chevallier <gatien.chevallier@...s.st.com>
> ---
> 
> Changes in V6:
>     	- Renamed access-controller to access-controllers
>     	- Removal of access-control-provider property
>     	- Removal of access-controller and access-controller-names
>     	  declaration in the patternProperties field. Add
>     	  additionalProperties: true in this field.
> 
> Changes in V5:
> 	- Renamed feature-domain* to access-control*
> 
> 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
> 	- Reordered the properties so it matches ETZPC
> 	- Add missing "feature-domain-controller" property
> 
>  .../bindings/bus/st,stm32-etzpc.yaml          | 87 +++++++++++++++++++
>  1 file changed, 87 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..9ca0ad39bc19
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/bus/st,stm32-etzpc.yaml
> @@ -0,0 +1,87 @@
> +# 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 <gatien.chevallier@...s.st.com>
> +
> +properties:
> +  compatible:
> +    contains:
> +      const: st,stm32-etzpc

Same here, needs 'simple-bus'.

> +
> +  reg:
> +    maxItems: 1
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 1
> +
> +  ranges: true
> +
> +  "#access-controller-cells":
> +    const: 1
> +    description:
> +      Contains the firewall ID associated to the peripheral.
> +
> +patternProperties:
> +  "^.*@[0-9a-f]+$":
> +    description: Peripherals
> +    type: object
> +
> +    additionalProperties: true
> +
> +    required:
> +      - access-controllers
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#address-cells"
> +  - "#size-cells"
> +  - "#access-controller-cells"
> +  - ranges
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    // In this example, the usart2 device refers to rifsc as its access
> +    // controller.

Looks like the comment is wrong.


> +    // 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@...07000 {
> +        compatible = "st,stm32-etzpc";
> +        reg = <0x5c007000 0x400>;
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        #access-controller-cells = <1>;
> +        ranges;
> +
> +        usart2: serial@...01000 {
> +            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";
> +            access-controllers = <&etzpc 17>;
> +        };
> +    };
> -- 
> 2.25.1
>