Re: [PATCH 1/4] dt-bindings: firmware: qcom,scm: Add minidump SRAM property

[Konrad Dybcio]

On 5/7/26 10:07 AM, Mukesh Ojha wrote:
> On most Qualcomm SoCs where minidump is supported, a word in always-on
> SRAM is shared between the kernel and boot firmware. Before DDR is
> initialised on the warm reset following a crash, firmware reads this
> word to decide if minidump is enabled and collect a minidump and where
>  to deliver it (USB upload to a host, or save to local storage).
> 
> Add 'sram' and 'sram-names' properties to the SCM binding to describe
> a region in always-on SRAM where the minidump download destination
> value could be written. Boot firmware reads it before DDR is initialised
> on a warm reset to decide where to store the minidump either to host
> PC or to on device storage.
> 
> Most of the Qualcomm SoC supporting minidump supports this, added the
> kaanapali SoC for now.
> 
> Suggested-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
> Signed-off-by: Mukesh Ojha <mukesh.ojha@xxxxxxxxxxxxxxxx>
> ---
>  .../bindings/firmware/qcom,scm.yaml           | 57 +++++++++++++++++++
>  1 file changed, 57 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
> index 7918d31f58b4..6813081fd74a 100644
> --- a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
> +++ b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
> @@ -127,6 +127,22 @@ properties:
>            - description: offset of the download mode control register
>      description: TCSR hardware block
>  
> +  sram:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    description:
> +      Phandle to a region in always-on SRAM used to store the download
> +      mode value for boot firmware to read before DDR is initialised on
> +      the next warm reset.
> +    maxItems: 1
> +
> +  sram-names:
> +    items:
> +      - const: minidump
> +
> +dependencies:
> +  sram: [ sram-names ]
> +  sram-names: [ sram ]
> +
>  allOf:
>    # Clocks
>    - if:
> @@ -229,6 +245,18 @@ allOf:
>        properties:
>          memory-region: false
>  
> +  - if:
> +      not:
> +        properties:
> +          compatible:
> +            contains:
> +              enum:
> +                - qcom,scm-kaanapali

This list will grow super large - like mentioned in the commit message,
to list almost all platforms.. I don't know if it makes sense to limit
this. Krzysztof/Rob?

Konrad