linux-kernel - [PATCH 2/2] arm64: dts: ti: k3-am62-phycore-som: Reserve RTOS IPC memory

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Message-ID: <20250131093531.1054924-2-w.egorov@phytec.de>
Date: Fri, 31 Jan 2025 10:35:31 +0100
From: Wadim Egorov <w.egorov@...tec.de>
To: <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <kees@...nel.org>,
	<tony.luck@...el.com>, <gpiccoli@...lia.com>
CC: <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <upstream@...ts.phytec.de>
Subject: [PATCH 2/2] arm64: dts: ti: k3-am62-phycore-som: Reserve RTOS IPC memory

Reserve a portion of memory for inter-processor communication between
all remote processors running RTOS or baremetal firmware.
Move ramoops to lower region so the IPC fits to the correct address.

Signed-off-by: Wadim Egorov <w.egorov@...tec.de>
---
 arch/arm64/boot/dts/ti/k3-am62-phycore-som.dtsi | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am62-phycore-som.dtsi b/arch/arm64/boot/dts/ti/k3-am62-phycore-som.dtsi
index 2ef4cbaec789..4bffa8ce0410 100644
--- a/arch/arm64/boot/dts/ti/k3-am62-phycore-som.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62-phycore-som.dtsi
@@ -36,15 +36,21 @@ reserved_memory: reserved-memory {
 		#size-cells = <2>;
 		ranges;
 
-		ramoops@...00000 {
+		ramoops@...00000 {
 			compatible = "ramoops";
-			reg = <0x00 0x9ca00000 0x00 0x00100000>;
+			reg = <0x00 0x9c700000 0x00 0x00100000>;
 			record-size = <0x8000>;
 			console-size = <0x8000>;
 			ftrace-size = <0x00>;
 			pmsg-size = <0x8000>;
 		};
 
+		rtos_ipc_memory_region: ipc-memories@...00000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0x9c800000 0x00 0x00300000>;
+			no-map;
+		};
+
 		mcu_m4fss_dma_memory_region: m4f-dma-memory@...00000 {
 			compatible = "shared-dma-pool";
 			reg = <0x00 0x9cb00000 0x00 0x100000>;
-- 
2.34.1