[PATCH v2] arm64: dts: qcom: shikra: Add BAM-DMUX support

[Vishnu Santhosh]

Add required nodes to enable the upstream BAM-DMUX WWAN driver on
Qualcomm Shikra SoC.

The SMSM (Shared Memory State Machine) node provides the power
control signaling between the AP and modem for BAM-DMUX. The
BAM DMA controller node describes the A2 modem BAM hardware as a
standard DMA controller. The BAM-DMUX node references the DMA
channels and the pc/pc-ack interrupt lines from the modem SMSM
entry for power control signaling.

The BAM-DMUX node is placed below the modem remoteproc so that
userspace can associate the resulting network interfaces with the
owning remoteproc via udev/sysfs, matching how qcom_q6v5_mss.c
already handles the equivalent node on older SoCs.

Signed-off-by: Vishnu Santhosh <vishnu.santhosh@xxxxxxxxxxxxxxxx>
---
This depends on the "arm64: dts: qcom: Extend Shikra device tree
with CDSP, LPAICP, MPSS remoteproc PAS and peripherals" series [1],
which is still under review and adds the "remoteproc_mpss" node this
series now attaches to.

The corresponding qcom_q6v5_pas.c change that makes the nested
"qcom,bam-dmux" node actually probe is being sent separately, since
it has no device tree dependency.

[1] https://lore.kernel.org/all/20260702-shikra-dt-m1-v5-0-f911ac92720c@xxxxxxxxxxxxxxxx/

Changes in v2:
- Move the "bam-dmux" node below the modem remoteproc
  ("remoteproc_mpss"), instead of at the root, so that userspace can
  associate the resulting network interfaces with the owning
  remoteproc via udev/sysfs (Stephan)
- Add the "shikra-dt-m1" series as a declared prerequisite, since it
  introduces the "remoteproc_mpss" node this series now depends on
- Link to v1: https://lore.kernel.org/r/20260611-qcom-shikra-dts-bam-dmux-v1-1-43d0b43d41ef@xxxxxxxxxxxxxxxx
---
 arch/arm64/boot/dts/qcom/shikra.dtsi | 51 ++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/shikra.dtsi b/arch/arm64/boot/dts/qcom/shikra.dtsi
index 205814c4b349ae19b605688357c6bd71e1ee61e9..246ea74d1fb1e293f0428d342301886dc52cb179 100644
--- a/arch/arm64/boot/dts/qcom/shikra.dtsi
+++ b/arch/arm64/boot/dts/qcom/shikra.dtsi
@@ -498,6 +498,28 @@ modem_smp2p_in: slave-kernel {
 		};
 	};
 
+	smsm {
+		compatible = "qcom,smsm";
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		mboxes = <0>, <&apcs_glb 13>;
+
+		apps_smsm: apps@0 {
+			reg = <0>;
+			#qcom,smem-state-cells = <1>;
+		};
+
+		modem_smsm: modem@1 {
+			reg = <1>;
+			interrupts = <GIC_SPI 69 IRQ_TYPE_EDGE_RISING 0>;
+
+			interrupt-controller;
+			#interrupt-cells = <2>;
+		};
+	};
+
 	soc: soc@0 {
 		compatible = "simple-bus";
 
@@ -1864,6 +1886,23 @@ glink-edge {
 				qcom,remote-pid = <1>;
 				label = "mpss";
 			};
+
+			bam_dmux: bam-dmux {
+				compatible = "qcom,bam-dmux";
+
+				interrupts-extended = <&modem_smsm 1 IRQ_TYPE_EDGE_BOTH>,
+						      <&modem_smsm 11 IRQ_TYPE_EDGE_BOTH>;
+				interrupt-names = "pc",
+						  "pc-ack";
+
+				qcom,smem-states = <&apps_smsm 1>,
+						   <&apps_smsm 11>;
+				qcom,smem-state-names = "pc",
+							"pc-ack";
+
+				dmas = <&bam_dmux_dma 4>, <&bam_dmux_dma 5>;
+				dma-names = "tx", "rx";
+			};
 		};
 
 		remoteproc_cdsp: remoteproc@b300000 {
@@ -1990,6 +2029,18 @@ glink-edge {
 			};
 		};
 
+		bam_dmux_dma: dma-controller@6044000 {
+			compatible = "qcom,bam-v1.7.0";
+			reg = <0x0 0x06044000 0x0 0x19000>;
+			interrupts = <GIC_SPI 74 IRQ_TYPE_EDGE_RISING 0>;
+			#dma-cells = <1>;
+			qcom,ee = <0>;
+
+			num-channels = <6>;
+			qcom,num-ees = <1>;
+			qcom,powered-remotely;
+		};
+
 		sram@c11e000 {
 			compatible = "qcom,shikra-imem", "mmio-sram";
 			reg = <0x0 0x0c11e000 0x0 0x1000>;

---
base-commit: 6e845bcb78c95af935094040bd4edc3c2b6dd784
change-id: 20260603-qcom-shikra-dts-bam-dmux-7fdcbb6fb662
prerequisite-change-id: 20260429-shikra-gcc-rpmcc-clks-2094edfff3b0:v5
prerequisite-patch-id: 59bb0a7828e41f546f734f127d81da83c0adcda9
prerequisite-patch-id: 197da6bcb15cadc47869dba88c8020987b25c335
prerequisite-patch-id: 8ec9c1eb03f052ae232ed54117abed38672c23f6
prerequisite-patch-id: 350db4f4bcdfc0fad9ed57cd5b1723f85ad44f5d
prerequisite-change-id: 20260524-shikra_epss_l3-522afe4fb8f5:v3
prerequisite-patch-id: b5d7f75df02fde56181f576a936baf09d0a72276
prerequisite-patch-id: 3ce52e07ae57139c2e2b71a29ed7d7250f6fcc87
prerequisite-change-id: 20260511-shikra-dt-d75d97454646:v7
prerequisite-patch-id: aa4ff7fbddd4c8836ce69aab89f2f91430194fcf
prerequisite-patch-id: ac83151a889855498d36288ddd36216d451340c8
prerequisite-patch-id: 2357cac636e019eaf14d6a493a1c72bca56fe405
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prerequisite-patch-id: 91af5f3c01e766a53ce8de69aa21847a2d6bbbf8
prerequisite-change-id: 20260525-shikra-dt-m1-082dec382e7f:v5
prerequisite-patch-id: 48ecd66c06c4fad81f91283c26ec57d95bbde29d
prerequisite-patch-id: 7d92e5a301d09616840e54dc9e4a81f30a64383c
prerequisite-patch-id: be1a16f53e23dd5ab90210a056c9da3559c6186d
prerequisite-patch-id: 3eff04500c55100c763aeac1f1f8c5768d500500
prerequisite-patch-id: ab22c5fdb2fa65b78ffef76bbe4459c8d5ffe7b2
prerequisite-patch-id: cb24efedb648271ef5c60ace96e2366d89254e8f
prerequisite-patch-id: 8be7df0395c5847a988c7e814c7db878b5932b11
prerequisite-patch-id: 0510992d022cef7317b6efee6765ac78c0225356
prerequisite-patch-id: de4327fcbe81f92a337f429b74e8220969a5b79f
prerequisite-patch-id: 968bffc36646412f8289b917f37e762a4297bcc8
prerequisite-patch-id: 35944403bd4480caad12657342da15ea71c6afbd

Best regards,
-- 
Vishnu Santhosh <vishnu.santhosh@xxxxxxxxxxxxxxxx>