[PATCH v6 2/3] dt-bindings: soc: qcom: apr: Add protection domain bindings

Sibi Sankar
2020-03-04T20:10:04Z

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@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
---

V6:
* Picked up Rob's R-b

V5:
* Picked up Bjorn's R-b

.../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";
+ ...
+ };
+ };