linux-kernel - [PATCH 7/8] dt-bindings: dma: qcom: bam-dma: Add missing required properties

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Message-Id: <20250212-bam-dma-fixes-v1-7-f560889e65d8@linaro.org>
Date: Wed, 12 Feb 2025 18:03:53 +0100
From: Stephan Gerhold <stephan.gerhold@...aro.org>
To: Vinod Koul <vkoul@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Andy Gross <agross@...nel.org>, 
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Yuvaraj Ranganathan <quic_yrangana@...cinc.com>, 
 Anusha Rao <quic_anusha@...cinc.com>, 
 Md Sadre Alam <quic_mdalam@...cinc.com>, linux-arm-msm@...r.kernel.org, 
 dmaengine@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Luca Weiss <luca.weiss@...rphone.com>
Subject: [PATCH 7/8] dt-bindings: dma: qcom: bam-dma: Add missing required
 properties

num-channels and qcom,num-ees are required when there are no clocks
specified in the device tree, because we have no reliable way to read them
from the hardware registers if we cannot ensure the BAM hardware is up when
the device is being probed.

This has often been forgotten when adding new SoC device trees, so make
this clear by describing this requirement in the schema.

Signed-off-by: Stephan Gerhold <stephan.gerhold@...aro.org>
---
 Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml b/Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml
index 3ad0d9b1fbc5e4f83dd316d1ad79773c288748ba..5f7e7763615578717651014cfd52745ea2132115 100644
--- a/Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml
+++ b/Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml
@@ -90,8 +90,12 @@ required:
 anyOf:
   - required:
       - qcom,powered-remotely
+      - num-channels
+      - qcom,num-ees
   - required:
       - qcom,controlled-remotely
+      - num-channels
+      - qcom,num-ees
   - required:
       - clocks
       - clock-names

-- 
2.47.2