linux-kernel - [PATCH v4 3/7] arm64: dts: imx8ulp-evk: reserved mem-ranges to constrain ele

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Date:   Wed, 12 Jul 2023 17:42:15 +0530
From:   Pankaj Gupta <pankaj.gupta@....com>
To:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        clin@...e.com, conor+dt@...nel.org, pierre.gondois@....com,
        ping.bai@....com, xiaoning.wang@....com, wei.fang@....com,
        peng.fan@....com, haibo.chen@....com, festevam@...il.com,
        linux-imx@....com, davem@...emloft.net, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, gaurav.jain@....com,
        alexander.stein@...tq-group.com, sahil.malhotra@....com,
        aisheng.dong@....com, V.Sethi@....com
Cc:     Pankaj Gupta <pankaj.gupta@....com>
Subject: [PATCH v4 3/7] arm64: dts: imx8ulp-evk: reserved mem-ranges to constrain ele_fw dma-range

EdgeLock Enclave are has a hardware limitation of restricted access
to the DDR memory range:
- 0x90000000 - 0xAFFFFFFF

ELE-FW 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@....com>
Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
---
 arch/arm64/boot/dts/freescale/imx8ulp-evk.dts | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts b/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
index f1c6d933a17c..e11b56722348 100644
--- a/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
@@ -19,6 +19,17 @@ memory@...00000 {
 		device_type = "memory";
 		reg = <0x0 0x80000000 0 0x80000000>;
 	};
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		ele_reserved: ele-reserved@...00000 {
+			compatible = "shared-dma-pool";
+			reg = <0 0x90000000 0 0x100000>;
+			no-map;
+		};
+	};
 
 	clock_ext_rmii: clock-ext-rmii {
 		compatible = "fixed-clock";
@@ -53,6 +64,10 @@ &usdhc0 {
 	status = "okay";
 };
 
+&ele_fw {
+	memory-region = <&ele_reserved>;
+};
+
 &fec {
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&pinctrl_enet>;
-- 
2.34.1