linux-kernel - [PATCH] riscv: dts: sophgo: add reserved memory node for CV1800B

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Date: Thu, 11 Apr 2024 08:45:00 +0800
From: Inochi Amaoto <inochiama@...look.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen Wang <unicorn_wang@...look.com>,
	Inochi Amaoto <inochiama@...look.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Jisheng Zhang <jszhang@...nel.org>,
	Guo Ren <guoren@...nel.org>,
	Drew Fustini <dfustini@...libre.com>
Cc: devicetree@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] riscv: dts: sophgo: add reserved memory node for CV1800B

The original dts of CV1800B has a weird memory length as it
contains reserved memory for coprocessor. Make this area a
separate node so it can get the real memory length.

Signed-off-by: Inochi Amaoto <inochiama@...look.com>
---
 arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts | 12 +++++++++---
 arch/riscv/boot/dts/sophgo/cv1800b.dtsi          |  5 +++++
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts b/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
index 3af9e34b3bc7..0b9128513357 100644
--- a/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
+++ b/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
@@ -23,9 +23,15 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};

-	memory@...00000 {
-		device_type = "memory";
-		reg = <0x80000000 0x3f40000>;
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		coprocessor_rtos: region@...40000 {
+			reg = <0x83f40000 0xc0000>;
+			no-map;
+		};
 	};
 };

diff --git a/arch/riscv/boot/dts/sophgo/cv1800b.dtsi b/arch/riscv/boot/dts/sophgo/cv1800b.dtsi
index 165e9e320a8c..17ce8aa415a8 100644
--- a/arch/riscv/boot/dts/sophgo/cv1800b.dtsi
+++ b/arch/riscv/boot/dts/sophgo/cv1800b.dtsi
@@ -7,6 +7,11 @@

 / {
 	compatible = "sophgo,cv1800b";
+
+	memory@...00000 {
+		device_type = "memory";
+		reg = <0x80000000 0x4000000>;
+	};
 };

 &plic {
--
2.44.0