arm64: dts: qcom: msm8976: Make blsp_dma controlled-remotely

[ Upstream commit 76270a18dbdf0bb50615f1b29d2cae8d683da01e ]

The blsp_dma controller is shared between the different subsystems,
which is why it is already initialized by the firmware. We should not
reinitialize it from Linux to avoid potential other users of the DMA
engine to misbehave.

In mainline this can be described using the "qcom,controlled-remotely"
property. In the downstream/vendor kernel from Qualcomm there is an
opposite "qcom,managed-locally" property. This property is *not* set
for the qcom,sps-dma@7884000 and qcom,sps-dma@7ac4000 [1] so adding
"qcom,controlled-remotely" upstream matches the behavior of the
downstream/vendor kernel.

Adding this fixes booting Longcheer L9360.

[1]: https://git.codelinaro.org/clo/la/kernel/msm-3.10/-/blob/LA.BR.1.3.7.c26/arch/arm/boot/dts/qcom/msm8976.dtsi#L1149-1163

Fixes: 0484d3ce0902 ("arm64: dts: qcom: Add DTS for MSM8976 and MSM8956 SoCs")
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: André Apitzsch <git@apitzsch.eu>
Link: https://lore.kernel.org/r/20250615-bqx5plus-v2-1-72b45c84237d@apitzsch.eu
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/arm64/boot/dts/qcom/msm8976.dtsi b/arch/arm64/boot/dts/qcom/msm8976.dtsi
index 4c5be22b47feeac89e2da2fb7d7c6363184d45d6..e01f6e8a17f2fc871f54d3f0492a1d19ee98bf90 100644 (file)
--- a/arch/arm64/boot/dts/qcom/msm8976.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8976.dtsi
@@ -862,6 +862,7 @@
                        clock-names = "bam_clk";
                        #dma-cells = <1>;
                        qcom,ee = <0>;
+                       qcom,controlled-remotely;
                };
 
                blsp1_uart1: serial@78af000 {
@@ -982,6 +983,7 @@
                        clock-names = "bam_clk";
                        #dma-cells = <1>;
                        qcom,ee = <0>;
+                       qcom,controlled-remotely;
                };
 
                blsp2_uart2: serial@7af0000 {