linux-kernel - [PATCH] arm64: zynqmp: Add memory reserved node for k26 Kria SOM board

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Message-ID: <8ddc7fb4bf40faead7a015ad7e095f3f7d2ec191.1686555698.git.michal.simek@amd.com>
Date:   Mon, 12 Jun 2023 09:41:45 +0200
From:   Michal Simek <michal.simek@....com>
To:     <linux-kernel@...r.kernel.org>, <monstr@...str.eu>,
        <michal.simek@...inx.com>, <git@...inx.com>
CC:     Sharath Kumar Dasari <sharath.kumar.dasari@...inx.com>,
        "Amit Kumar Mahapatra" <amit.kumar-mahapatra@...inx.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Manikanta Guntupalli <manikanta.guntupalli@....com>,
        Parth Gajjar <parth.gajjar@....com>,
        "Rob Herring" <robh+dt@...nel.org>,
        Srinivas Neeli <srinivas.neeli@...inx.com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH] arm64: zynqmp: Add memory reserved node for k26 Kria SOM board

From: Sharath Kumar Dasari <sharath.kumar.dasari@...inx.com>

PMUFW (Power Management Unit firmware) requires top 1MB of the lower DDR
memory reserved for its operation, this is missing in k26 SM static dts
file. Bootloader or kernel shouldn't access this location.

Signed-off-by: Sharath Kumar Dasari <sharath.kumar.dasari@...inx.com>
Signed-off-by: Michal Simek <michal.simek@....com>
---

 arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts b/arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts
index c1f21b0e1760..c4774a42d5fc 100644
--- a/arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts
+++ b/arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts
@@ -50,6 +50,17 @@ memory@0 {
 		reg = <0x0 0x0 0x0 0x80000000>, <0x8 0x00000000 0x0 0x80000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		pmu_region: pmu@...00000 {
+			reg = <0x0 0x7ff00000 0x0 0x100000>;
+			no-map;
+		};
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";
 		autorepeat;
-- 
2.36.1