linux-kernel - [PATCH v6 11/11] riscv: dts: microchip: update memory configuration for v2022.10

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Date:   Tue, 27 Sep 2022 12:19:23 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Daire McNamara <daire.mcnamara@...rochip.com>,
        Shravan Chippa <shravan.chippa@...rochip.com>
CC:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Cyril Jean <Cyril.Jean@...rochip.com>,
        Lewis Hanly <lewis.hanly@...rochip.com>,
        Vattipalli Praveen <praveen.kumar@...rochip.com>,
        Wolfgang Grandegger <wg@...es-embedded.de>,
        Hugh Breslin <hugh.breslin@...rochip.com>,
        <devicetree@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v6 11/11] riscv: dts: microchip: update memory configuration for v2022.10

In the v2022.10 reference design, the seg registers are going to be
changed, resulting in a required change to the memory map in Linux.
A small 4M reservation is made at the end of 32-bit DDR to provide some
memory for the HSS to use, so that it can cache its payload.bin between
reboots of a specific context.

Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
---
 arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts b/arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts
index 42d350fe6c6b..31f88cb4d5e5 100644
--- a/arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts
+++ b/arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts
@@ -33,15 +33,26 @@ cpus {
 
 	ddrc_cache_lo: memory@...00000 {
 		device_type = "memory";
-		reg = <0x0 0x80000000 0x0 0x2e000000>;
+		reg = <0x0 0x80000000 0x0 0x40000000>;
 		status = "okay";
 	};
 
 	ddrc_cache_hi: memory@...0000000 {
 		device_type = "memory";
-		reg = <0x10 0x0 0x0 0x40000000>;
+		reg = <0x10 0x40000000 0x0 0x40000000>;
 		status = "okay";
 	};
+
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		hss_payload: region@...00000 {
+			reg = <0x0 0xBFC00000 0x0 0x400000>;
+			no-map;
+		};
+	};
 };
 
 &core_pwm0 {
-- 
2.37.3