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 06af6e5ec578ed5e6061ce976d0026c45b5d8fc3..884b5bb54ba8243b4a4dd718658d362632de5237 100644 (file)
--- a/arch/arm64/boot/dts/qcom/msm8976.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8976.dtsi
@@ -1330,6 +1330,7 @@
                        clock-names = "bam_clk";
                        #dma-cells = <1>;
                        qcom,ee = <0>;
+                       qcom,controlled-remotely;
                };
 
                blsp1_uart1: serial@78af000 {
@@ -1450,6 +1451,7 @@
                        clock-names = "bam_clk";
                        #dma-cells = <1>;
                        qcom,ee = <0>;
+                       qcom,controlled-remotely;
                };
 
                blsp2_uart2: serial@7af0000 {