Re: [PATCH v6 02/13] dt-bindings: remoteproc: qcom: pas: Add QMP property

Rob Herring
2021-09-08T13:51:57Z

On Mon, Sep 06, 2021 at 01:53:46PM +0530, Sibi Sankar wrote:
> The load state power-domain, used by the co-processors to notify the
> Always on Subsystem (AOSS) that a particular co-processor is up/down,
> suffers from the side-effect of changing states during suspend/resume.
> However the co-processors enter low-power modes independent to that of
> the application processor and their states are expected to remain
> unaltered across system suspend/resume cycles. To achieve this behavior
> let's drop the load state power-domain and replace them with the qmp
> property for all SoCs supporting low power mode signalling.
>
> Due to the current broken load state implementation, we can afford the
> binding breakage that ensues and the remoteproc functionality will remain
> the same when using newer kernels with older dtbs.
>
> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
> Reviewed-by: Stephen Boyd <swboyd@chromium.org>
> ---
>
> v6:
> * Updated commit message to explain binding breakage. [Stephen]
>
> .../devicetree/bindings/remoteproc/qcom,adsp.yaml | 61 +++++++++++-----------
> 1 file changed, 31 insertions(+), 30 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,adsp.yaml b/Documentation/devicetree/bindings/remoteproc/qcom,adsp.yaml
> index 0c112f3264a9..0d2b5bd4907a 100644
> --- a/Documentation/devicetree/bindings/remoteproc/qcom,adsp.yaml
> +++ b/Documentation/devicetree/bindings/remoteproc/qcom,adsp.yaml
> @@ -93,6 +93,10 @@ properties:
> maxItems: 1
> description: Reference to the reserved-memory for the Hexagon core
>
> + qcom,qmp:
> + $ref: /schemas/types.yaml#/definitions/phandle
> + description: Reference to the AOSS side-channel message RAM.
> +

[...]

> @@ -511,6 +486,32 @@ allOf:
> - const: mss_restart
> - const: pdc_reset
>
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - qcom,sc7180-mpss-pas
> + - qcom,sc8180x-adsp-pas
> + - qcom,sc8180x-cdsp-pas
> + - qcom,sc8180x-mpss-pas
> + - qcom,sm8150-adsp-pas
> + - qcom,sm8150-cdsp-pas
> + - qcom,sm8150-mpss-pas
> + - qcom,sm8150-slpi-pas
> + - qcom,sm8250-adsp-pas
> + - qcom,sm8250-cdsp-pas
> + - qcom,sm8250-slpi-pas
> + - qcom,sm8350-adsp-pas
> + - qcom,sm8350-cdsp-pas
> + - qcom,sm8350-mpss-pas
> + - qcom,sm8350-slpi-pas
> + then:
> + properties:
> + qcom,qmp:
> + items:
> + - description: Reference to the AOSS side-channel message RAM.

This doesn't do anything. The property is already allowed for all
compatibles. Perhaps you want to negate the if and put 'qcom,qmp: false'
here.

Rob