linux-kernel - [PATCH v12 2/5] arm64: dts: ti: k3-am625-sk: Add M4F remoteproc node

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Message-ID: <20241003170118.24932-3-afd@ti.com>
Date: Thu, 3 Oct 2024 12:01:15 -0500
From: Andrew Davis <afd@...com>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
        Tero
 Kristo <kristo@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof
 Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley
	<conor+dt@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Andrew Davis <afd@...com>
Subject: [PATCH v12 2/5] arm64: dts: ti: k3-am625-sk: Add M4F remoteproc node

From: Hari Nagalla <hnagalla@...com>

The AM62x SoCs of the TI K3 family have a Cortex M4F core in the MCU
domain. This core can be used by non safety applications as a remote
processor. When used as a remote processor with virtio/rpmessage IPC,
two carveout reserved memory nodes are needed. The first region is used
as a DMA pool for the rproc device, and the second region will furnish
the static carveout regions for the firmware memory.

The current carveout addresses and sizes are defined statically for
each rproc device. The M4F processor does not have an MMU, and as such
requires the exact memory used by the firmware to be set-aside.

Signed-off-by: Hari Nagalla <hnagalla@...com>
Signed-off-by: Andrew Davis <afd@...com>
---
 .../arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
index 44ff67b6bf1e4..6957b3e44c82f 100644
--- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
@@ -56,6 +56,18 @@ linux,cma {
 			linux,cma-default;
 		};
 
+		mcu_m4fss_dma_memory_region: m4f-dma-memory@...00000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0x9cb00000 0x00 0x100000>;
+			no-map;
+		};
+
+		mcu_m4fss_memory_region: m4f-memory@...00000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0x9cc00000 0x00 0xe00000>;
+			no-map;
+		};
+
 		secure_tfa_ddr: tfa@...80000 {
 			reg = <0x00 0x9e780000 0x00 0x80000>;
 			alignment = <0x1000>;
@@ -464,6 +476,13 @@ mbox_m4_0: mbox-m4-0 {
 	};
 };
 
+&mcu_m4fss {
+	mboxes = <&mailbox0_cluster0 &mbox_m4_0>;
+	memory-region = <&mcu_m4fss_dma_memory_region>,
+			<&mcu_m4fss_memory_region>;
+	status = "okay";
+};
+
 &usbss0 {
 	bootph-all;
 	status = "okay";
-- 
2.39.2