[PATCH 6.18 493/752] arm64: dts: qcom: sm8750: Fix BAM DMA probing

Sasha Levin
2026-02-28T17:55:08Z

From: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

[ Upstream commit 1c6192ec9c4ab8bdb7b2cf8763b7ef7e38671ffe ]

Bindings always required "qcom,num-ees" and "num-channels" properties,
as reported by dtbs_check:

sm8750-mtp.dtb: dma-controller@1dc4000 (qcom,bam-v1.7.4): 'anyOf' conditional failed, one must be fixed:
'qcom,powered-remotely' is a required property
'num-channels' is a required property
'qcom,num-ees' is a required property
'clocks' is a required property
'clock-names' is a required property

However since commit 5068b5254812 ("dmaengine: qcom: bam_dma: Fix DT
error handling for num-channels/ees") missing properties are actually
fatal and BAM does not probe:

bam-dma-engine 1dc4000.dma-controller: num-channels unspecified in dt
bam-dma-engine 1dc4000.dma-controller: probe with driver bam-dma-engine failed with error -22

Fixes: eeb0f3e4ea67 ("arm64: dts: qcom: sm8750: Add QCrypto nodes")
Cc: stable@vger.kernel.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20251229115734.205744-2-krzysztof.kozlowski@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm64/boot/dts/qcom/sm8750.dtsi | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sm8750.dtsi b/arch/arm64/boot/dts/qcom/sm8750.dtsi
index a82d9867c7cb6..33963fee1f699 100644
--- a/arch/arm64/boot/dts/qcom/sm8750.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8750.dtsi
@@ -2072,6 +2072,8 @@ cryptobam: dma-controller@1dc4000 {
<&apps_smmu 0x481 0>;

qcom,ee = <0>;
+ qcom,num-ees = <4>;
+ num-channels = <20>;
qcom,controlled-remotely;
};

--
2.51.0