linux-kernel - Re: [PATCH v4 3/5] dt-bindings: bus: Add STM32 ETZPC firewall controller

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Message-ID: <20200713170542.GA384390@bogus>
Date:   Mon, 13 Jul 2020 11:05:42 -0600
From:   Rob Herring <robh@...nel.org>
To:     Benjamin Gaignard <benjamin.gaignard@...com>
Cc:     mcoquelin.stm32@...il.com, alexandre.torgue@...com,
        linus.walleij@...aro.org, gregkh@...uxfoundation.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stefano.stabellini@...inx.com, tomase@...inx.com,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 3/5] dt-bindings: bus: Add STM32 ETZPC firewall
 controller

On Wed, Jul 01, 2020 at 03:25:21PM +0200, Benjamin Gaignard wrote:
> Document STM32 ETZPC firewall controller bindings
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
> ---
>  .../bindings/bus/stm32/st,stm32-etzpc.yaml         | 46 ++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/bus/stm32/st,stm32-etzpc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/bus/stm32/st,stm32-etzpc.yaml b/Documentation/devicetree/bindings/bus/stm32/st,stm32-etzpc.yaml
> new file mode 100644
> index 000000000000..d92865fda40c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/bus/stm32/st,stm32-etzpc.yaml
> @@ -0,0 +1,46 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/bus/stm32/st,stm32-etzpc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: STM32 Extended TrustZone Protection controller
> +
> +maintainers:
> +  - Benjamin Gaignard <benjamin.gaignard@...com>
> +
> +description: STMicroelectronics's STM32 firewall bus controller implementation
> +
> +allOf:
> +  - $ref: "firewall-provider.yaml#"
> +  - $ref: /schemas/simple-bus.yaml#

Your bus has controls/setup, it's not a simple-bus.

Do you expect an old kernel or one with support for "st,stm32-etzpc-bus" 
disabled to work? How's it going to know if certain nodes can't be 
accessed without that support? 

> +
> +properties:
> +  compatible:
> +    contains:
> +      enum:
> +        - st,stm32-etzpc-bus
> +
> +  reg:
> +   maxItems: 1
> +
> +  '#firewall-cells':
> +    const: 2
> +
> +required:
> +  - compatible
> +  - reg
> +  - '#firewall-cells'
> +
> +examples:
> +  - |
> +    soc@...07000 {
> +      compatible = "st,stm32-etzpc-bus", "simple-bus";
> +      reg = <0x5c007000 0x400>;
> +      #firewall-cells = <2>;
> +      #address-cells = <1>;
> +      #size-cells = <1>;
> +      ranges;
> +    };
> +
> +...
> -- 
> 2.15.0
>