linux-kernel - [PATCH v2 4/4] ARM: dts: qcom: msm8226: Add IMEM node

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Message-Id: <20230520121933.15533-5-matti.lehtimaki@gmail.com>
Date:   Sat, 20 May 2023 15:19:33 +0300
From:   Matti Lehtimäki <matti.lehtimaki@...il.com>
To:     linux-arm-msm@...r.kernel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Matti Lehtimäki <matti.lehtimaki@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/4] ARM: dts: qcom: msm8226: Add IMEM node

This enables userspace to signal the bootloader to go into the
bootloader or recovery mode.

The magic values can be found in both the downstream kernel and the LK
kernel (bootloader).

Signed-off-by: Matti Lehtimäki <matti.lehtimaki@...il.com>
---
Changes in v2:
  - Always enable IMEM node
  - Move reboot-mode magic numbers to platform,
    those should be always the same
---
 arch/arm/boot/dts/qcom-msm8226.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/qcom-msm8226.dtsi b/arch/arm/boot/dts/qcom-msm8226.dtsi
index 8644540f5aae..284b7c666fea 100644
--- a/arch/arm/boot/dts/qcom-msm8226.dtsi
+++ b/arch/arm/boot/dts/qcom-msm8226.dtsi
@@ -641,6 +641,20 @@ smd-edge {
 				label = "lpass";
 			};
 		};
+
+		sram@...05000 {
+			compatible = "qcom,msm8226-imem", "syscon", "simple-mfd";
+			reg = <0xfe805000 0x1000>;
+
+			reboot-mode {
+				compatible = "syscon-reboot-mode";
+				offset = <0x65c>;
+
+				mode-bootloader = <0x77665500>;
+				mode-normal     = <0x77665501>;
+				mode-recovery   = <0x77665502>;
+			};
+		};
 	};
 
 	timer {
-- 
2.34.1