linux-kernel - [RFC PATCH 5/5] arm64: dts: imx93-kontron: Add DMA memory region for ELE firmware

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Message-ID: <20250416142715.1042363-6-frieder@fris.de>
Date: Wed, 16 Apr 2025 16:26:24 +0200
From: Frieder Schrempf <frieder@...s.de>
To: Peng Fan <peng.fan@....com>,
	Pankaj Gupta <pankaj.gupta@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Conor Dooley <conor+dt@...nel.org>,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	linux-kernel@...r.kernel.org,
	Rob Herring <robh@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>
Cc: Frieder Schrempf <frieder.schrempf@...tron.de>,
	Fabio Estevam <festevam@...il.com>,
	Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: [RFC PATCH 5/5] arm64: dts: imx93-kontron: Add DMA memory region for ELE firmware

From: Frieder Schrempf <frieder.schrempf@...tron.de>

The Edgelock Enclave firmware requires a small 1 MiB memory pool.
Reserving this pool makes the ELE firmware driver probe and allows
us to use the S400 API.

Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
---
 .../boot/dts/freescale/imx93-kontron-osm-s.dtsi  | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx93-kontron-osm-s.dtsi b/arch/arm64/boot/dts/freescale/imx93-kontron-osm-s.dtsi
index 119a16207059..44d98cf812bf 100644
--- a/arch/arm64/boot/dts/freescale/imx93-kontron-osm-s.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx93-kontron-osm-s.dtsi
@@ -24,6 +24,18 @@ chosen {
 		stdout-path = &lpuart1;
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		ele_reserved: memory@...00000 {
+			compatible = "shared-dma-pool";
+			reg = <0 0x90000000 0 0x100000>;
+			no-map;
+		};
+	};
+
 	reg_usdhc2_vcc: regulator-usdhc2-vcc {
 		compatible = "regulator-fixed";
 		pinctrl-names = "default";
@@ -116,6 +128,10 @@ &gpio4 {
 			  "GPIO_B_0", "CARRIER_PWR_EN";
 };
 
+&hsm0 {
+	memory-region = <&ele_reserved>;
+};
+
 &lpi2c1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_lpi2c1>;
-- 
2.49.0