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From:   Pankaj Gupta <pankaj.gupta@nxp.com>
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Cc:     Pankaj Gupta <pankaj.gupta@nxp.com>
Subject: [PATCH v2 3/7] arm64: dts: imx93-11x11-evk: reserved mem-ranges to constrain ele-mu dma-range
Date:   Wed, 19 Apr 2023 23:25:34 +0530
Message-Id: <20230419175538.855493-4-pankaj.gupta@nxp.com>
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EdgeLock Enclave are has a hardware limitation of restricted access
to the DDR memory range:
- 0x80000000  0x9FFFFFFF

ELE-MU driver requireis 1MB of memory. In this patch the we are reserving
1MB of ddr memory region from the lower 32-bit range.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com>
---
 arch/arm64/boot/dts/freescale/imx93-11x11-evk.dts | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx93-11x11-evk.dts b/arch/arm64/boot/dts/freescale/imx93-11x11-evk.dts
index fefb93487291..bb090300829e 100644
--- a/arch/arm64/boot/dts/freescale/imx93-11x11-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx93-11x11-evk.dts
@@ -7,6 +7,10 @@
 
 #include "imx93.dtsi"
 
+&ele_mu {
+	memory-region = <&ele_reserved>;
+};
+
 / {
 	model = "NXP i.MX93 11X11 EVK board";
 	compatible = "fsl,imx93-11x11-evk", "fsl,imx93";
@@ -22,6 +26,17 @@ reg_vref_1v8: regulator-adc-vref {
 		regulator-max-microvolt = <1800000>;
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+		ele_reserved: ele-reserved@a4120000 {
+			compatible = "shared-dma-pool";
+			reg = <0 0xa4120000 0 0x100000>;
+			no-map;
+		};
+	};
+
 	reg_usdhc2_vmmc: regulator-usdhc2 {
 		compatible = "regulator-fixed";
 		pinctrl-names = "default";
-- 
2.34.1