linux-kernel - [PATCH 01/11] arm64: dts: qcom: sc7280: Mark some nodes as 'reserved'

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Message-Id: <20230830-fp5-initial-v1-1-5a954519bbad@fairphone.com>
Date:   Wed, 30 Aug 2023 11:58:26 +0200
From:   Luca Weiss <luca.weiss@...rphone.com>
To:     cros-qcom-dts-watchers@...omium.org,
        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>,
        Conor Dooley <conor+dt@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-pm@...r.kernel.org, Luca Weiss <luca.weiss@...rphone.com>
Subject: [PATCH 01/11] arm64: dts: qcom: sc7280: Mark some nodes as
 'reserved'

With the standard Qualcomm TrustZone setup, components such as lpasscc,
pdc_reset and watchdog shouldn't be touched by Linux. Mark them with
the status 'reserved' and reeable them in the chrome-common dtsi.

Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
 arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi | 12 ++++++++++++
 arch/arm64/boot/dts/qcom/sc7280.dtsi               |  5 ++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi b/arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi
index 2e1cd219fc18..8eb30aa226a2 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi
@@ -46,6 +46,14 @@ wpss_mem: memory@...00000 {
 	};
 };
 
+&lpasscc {
+	status = "okay";
+};
+
+&pdc_reset {
+	status = "okay";
+};
+
 /* The PMIC PON code isn't compatible w/ how Chrome EC/BIOS handle things. */
 &pmk8350_pon {
 	status = "disabled";
@@ -84,6 +92,10 @@ &scm {
 	dma-coherent;
 };
 
+&watchdog {
+	status = "okay";
+};
+
 &wifi {
 	status = "okay";
 
diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
index 042908048d09..98a8d627a348 100644
--- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
@@ -2267,6 +2267,7 @@ lpasscc: lpasscc@...0000 {
 			clocks = <&gcc GCC_CFG_NOC_LPASS_CLK>;
 			clock-names = "iface";
 			#clock-cells = <1>;
+			status = "reserved";
 		};
 
 		lpass_rx_macro: codec@...0000 {
@@ -4216,6 +4217,7 @@ pdc_reset: reset-controller@...0000 {
 			compatible = "qcom,sc7280-pdc-global";
 			reg = <0 0x0b5e0000 0 0x20000>;
 			#reset-cells = <1>;
+			status = "reserved";
 		};
 
 		tsens0: thermal-sensor@...3000 {
@@ -5212,11 +5214,12 @@ msi-controller@...40000 {
 			};
 		};
 
-		watchdog@...10000 {
+		watchdog: watchdog@...10000 {
 			compatible = "qcom,apss-wdt-sc7280", "qcom,kpss-wdt";
 			reg = <0 0x17c10000 0 0x1000>;
 			clocks = <&sleep_clk>;
 			interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>;
+			status = "reserved";
 		};
 
 		timer@...20000 {

-- 
2.42.0