linux-kernel - [PATCH v5 06/22] dt-bindings: qcom-bam: Add "powered remotely" mode

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Date:   Wed, 10 Nov 2021 16:29:06 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     linux-arm-msm@...r.kernel.org, linux-crypto@...r.kernel.org
Cc:     bhupesh.sharma@...aro.org, bhupesh.linux@...il.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, agross@...nel.org, herbert@...dor.apana.org.au,
        davem@...emloft.net, stephan@...hold.net,
        Thara Gopinath <thara.gopinath@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: [PATCH v5 06/22] dt-bindings: qcom-bam: Add "powered remotely" mode

In some configurations, the BAM DMA controller is set up by a remote
processor and the local processor can simply start making use of it
without setting up the BAM. This is already supported using the
"qcom,controlled-remotely" property.

However, for some reason another possible configuration is that the
remote processor is responsible for powering up the BAM, but we are
still responsible for initializing it (e.g. resetting it etc). Add
a "qcom,powered-remotely" property to describe that configuration.

Cc: Thara Gopinath <thara.gopinath@...aro.org>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
[moved Stephan's change to the YAML dt-binding format]
Signed-off-by: Stephan Gerhold <stephan@...hold.net>
---
 Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
index cfff3a2286fb..bf0a59e8a2bf 100644
--- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
+++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
@@ -73,6 +73,12 @@ properties:
       Indicates that the bam is controlled by remote proccessor i.e.
       execution environment.
 
+  qcom,powered-remotely:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Indicates that the bam is powered up by a remote processor
+      but must be initialized by the local processor.
+
   qcom,num-ees:
     $ref: /schemas/types.yaml#/definitions/uint32
     minimum: 0
-- 
2.31.1