linux-kernel - Re: [PATCH RFC 1/2] dt-bindings: arm: Document reboot mode magic

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Message-ID: <20231031174855.GA1797181-robh@kernel.org>
Date:   Tue, 31 Oct 2023 12:48:55 -0500
From:   Rob Herring <robh@...nel.org>
To:     Elliot Berman <quic_eberman@...cinc.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Satya Durga Srinivasu Prabhala <quic_satyap@...cinc.com>,
        Melody Olvera <quic_molvera@...cinc.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Florian Fainelli <florian.fainelli@...adcom.com>
Subject: Re: [PATCH RFC 1/2] dt-bindings: arm: Document reboot mode magic

On Mon, Oct 30, 2023 at 02:31:33PM -0700, Elliot Berman wrote:
> Add bindings to describe vendor-specific reboot modes. Values here
> correspond to valid parameters to vendor-specific reset types in PSCI
> SYSTEM_RESET2 call.
> 
> Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
> ---
>  Documentation/devicetree/bindings/arm/psci.yaml | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml
> index 0c5381e081bd..dc23e901bd0a 100644
> --- a/Documentation/devicetree/bindings/arm/psci.yaml
> +++ b/Documentation/devicetree/bindings/arm/psci.yaml
> @@ -122,6 +122,19 @@ patternProperties:
>        [3] Documentation/devicetree/bindings/power/power-domain.yaml
>        [4] Documentation/devicetree/bindings/power/domain-idle-state.yaml
>  
> +  "^reboot-mode-.*$":
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 1
> +    maxItems: 2
> +    description: |
> +      Describes a vendor-specific reset type. The string after "reboot-mode-"
> +      maps a reboot mode to the parameters in the PSCI SYSTEM_RESET2 call.
> +
> +      Parameters are named reboot-mode-xxx = <type[, cookie]>, where xxx
> +      is the name of the magic reboot mode, type is the lower 31 bits
> +      of the reset_type, and, optionally, the cookie value. If the cookie
> +      is not provided, it is defaulted to zero.

Please use and possibly extend the existing reboot-mode binding.

> +
>  required:
>    - compatible
>    - method
> 
> -- 
> 2.41.0
>