On Wed 26 Feb 09:00 PST 2020, Sibi Sankar wrote:
> Qualcomm SoCs (starting with MSM8998) allow for multiple protection
> domains (PDs) to run on the same Q6 sub-system. This allows for
> services like AVS AUDIO to have their own separate address space and
> crash/recover without disrupting the other PDs running on the same Q6
> ADSP. Add "qcom,protection-domain" bindings to capture the dependencies
> between the APR service and the PD on which the apr service runs.
>
Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> Signed-off-by: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/soc/qcom/qcom,apr.txt | 50 +++++++++++++++++++
> 1 file changed, 50 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt
> index db501269f47b8..f8fa71f5d84ba 100644
> --- a/Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt
> @@ -45,6 +45,18 @@ by the individual bindings for the specific service
> 12 - Ultrasound stream manager.
> 13 - Listen stream manager.
>
> +- qcom,protection-domain
> + Usage: optional
> + Value type: <stringlist>
> + Definition: Must list the protection domain service name and path
> + that the particular apr service has a dependency on.
> + Possible values are :
> + "avs/audio", "msm/adsp/audio_pd".
> + "kernel/elf_loader", "msm/modem/wlan_pd".
> + "tms/servreg", "msm/adsp/audio_pd".
> + "tms/servreg", "msm/modem/wlan_pd".
> + "tms/servreg", "msm/slpi/sensor_pd".
> +
> = EXAMPLE
> The following example represents a QDSP based sound card on a MSM8996 device
> which uses apr as communication between Apps and QDSP.
> @@ -82,3 +94,41 @@ which uses apr as communication between Apps and QDSP.
> ...
> };
> };
> +
> += EXAMPLE 2
> +The following example represents a QDSP based sound card with protection domain
> +dependencies specified. Here some of the apr services are dependent on services
> +running on protection domain hosted on ADSP/SLPI remote processors while others
> +have no such dependency.
> +
> + apr {
> + compatible = "qcom,apr-v2";
> + qcom,glink-channels = "apr_audio_svc";
> + qcom,apr-domain = <APR_DOMAIN_ADSP>;
> +
> + q6core {
> + compatible = "qcom,q6core";
> + reg = <APR_SVC_ADSP_CORE>;
> + };
> +
> + q6afe: q6afe {
> + compatible = "qcom,q6afe";
> + reg = <APR_SVC_AFE>;
> + qcom,protection-domain = "avs/audio", "msm/adsp/audio_pd";
> + ...
> + };
> +
> + q6asm: q6asm {
> + compatible = "qcom,q6asm";
> + reg = <APR_SVC_ASM>;
> + qcom,protection-domain = "tms/servreg", "msm/slpi/sensor_pd";
> + ...
> + };
> +
> + q6adm: q6adm {
> + compatible = "qcom,q6adm";
> + reg = <APR_SVC_ADM>;
> + qcom,protection-domain = "avs/audio", "msm/adsp/audio_pd";
> + ...
> + };
> + };
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
