linux-kernel - [PATCH 6/9] arm64: dts: qcom: msm8939: Reserve firmware memory dynamically

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Message-Id: <20230911-msm8916-rmem-v1-6-b7089ec3e3a1@gerhold.net>
Date:   Mon, 11 Sep 2023 19:41:48 +0200
From:   Stephan Gerhold <stephan@...hold.net>
To:     Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Stephan Gerhold <stephan@...hold.net>
Subject: [PATCH 6/9] arm64: dts: qcom: msm8939: Reserve firmware memory
 dynamically

Follow the example of MSM8916 and reserve the firmware memory regions
dynamically to allow boards to define only the device-specific parts.

Signed-off-by: Stephan Gerhold <stephan@...hold.net>
---
 arch/arm64/boot/dts/qcom/msm8939.dtsi | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/msm8939.dtsi b/arch/arm64/boot/dts/qcom/msm8939.dtsi
index b0a64e468629..ebea6de1177b 100644
--- a/arch/arm64/boot/dts/qcom/msm8939.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8939.dtsi
@@ -346,22 +346,38 @@ rfsa@...e0000 {
 		};
 
 		mpss_mem: mpss@...00000 {
+			/*
+			 * The memory region for the mpss firmware is generally
+			 * relocatable and could be allocated dynamically.
+			 * However, many firmware versions tend to fail when
+			 * loaded to some special addresses, so it is hard to
+			 * define reliable alloc-ranges.
+			 *
+			 * alignment = <0x0 0x400000>;
+			 * alloc-ranges = <0x0 0x86800000 0x0 0x8000000>;
+			 */
 			reg = <0x0 0x86800000 0x0 0x5500000>;
 			no-map;
 		};
 
-		wcnss_mem: wcnss@...00000 {
-			reg = <0x0 0x8bd00000 0x0 0x600000>;
+		wcnss_mem: wcnss {
+			size = <0x0 0x600000>;
+			alignment = <0x0 0x100000>;
+			alloc-ranges = <0x0 0x86800000 0x0 0x8000000>;
 			no-map;
 		};
 
-		venus_mem: venus@...00000 {
-			reg = <0x0 0x8c300000 0x0 0x800000>;
+		venus_mem: venus {
+			size = <0x0 0x800000>;
+			alignment = <0x0 0x100000>;
+			alloc-ranges = <0x0 0x86800000 0x0 0x8000000>;
 			no-map;
 		};
 
-		mba_mem: mba@...00000 {
-			reg = <0x0 0x8cb00000 0x0 0x100000>;
+		mba_mem: mba {
+			size = <0x0 0x100000>;
+			alignment = <0x0 0x100000>;
+			alloc-ranges = <0x0 0x86800000 0x0 0x8000000>;
 			no-map;
 		};
 	};

-- 
2.42.0