linux-kernel - [PATCH v2 1/2] ARM: dts: sun8i: a83t: Add missing cooling device properties for CPUs

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Message-Id: <20190328113159.9668-2-megous@megous.com>
Date:   Thu, 28 Mar 2019 12:31:58 +0100
From:   megous@...ous.com
To:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     Ondrej Jirman <megous@...ous.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] ARM: dts: sun8i: a83t: Add missing cooling device properties for CPUs

From: Ondrej Jirman <megous@...ous.com>

Enable to use CPUs as cooling device in the future, by adding
"#cooling-cells" to each CPU node. This property should be present for
all the CPUs of a cluster. If these are present only for a subset of
CPUs of a cluster then things will start falling apart as soon as the
CPUs are brought online in a different order. For example, this will
happen because the operating system looks for such properties in the CPU
node it is trying to bring up, so that it can register a cooling device.

Signed-off-by: Ondrej Jirman <megous@...ous.com>
---
 arch/arm/boot/dts/sun8i-a83t.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-a83t.dtsi b/arch/arm/boot/dts/sun8i-a83t.dtsi
index fcb7ef5ce2df..7a40b7d77ec0 100644
--- a/arch/arm/boot/dts/sun8i-a83t.dtsi
+++ b/arch/arm/boot/dts/sun8i-a83t.dtsi
@@ -69,6 +69,7 @@
 			cci-control-port = <&cci_control0>;
 			enable-method = "allwinner,sun8i-a83t-smp";
 			reg = <0>;
+			#cooling-cells = <2>;
 		};
 
 		cpu@1 {
@@ -78,6 +79,7 @@
 			cci-control-port = <&cci_control0>;
 			enable-method = "allwinner,sun8i-a83t-smp";
 			reg = <1>;
+			#cooling-cells = <2>;
 		};
 
 		cpu@2 {
@@ -87,6 +89,7 @@
 			cci-control-port = <&cci_control0>;
 			enable-method = "allwinner,sun8i-a83t-smp";
 			reg = <2>;
+			#cooling-cells = <2>;
 		};
 
 		cpu@3 {
@@ -96,6 +99,7 @@
 			cci-control-port = <&cci_control0>;
 			enable-method = "allwinner,sun8i-a83t-smp";
 			reg = <3>;
+			#cooling-cells = <2>;
 		};
 
 		cpu100: cpu@100 {
@@ -107,6 +111,7 @@
 			cci-control-port = <&cci_control1>;
 			enable-method = "allwinner,sun8i-a83t-smp";
 			reg = <0x100>;
+			#cooling-cells = <2>;
 		};
 
 		cpu@101 {
@@ -116,6 +121,7 @@
 			cci-control-port = <&cci_control1>;
 			enable-method = "allwinner,sun8i-a83t-smp";
 			reg = <0x101>;
+			#cooling-cells = <2>;
 		};
 
 		cpu@102 {
@@ -125,6 +131,7 @@
 			cci-control-port = <&cci_control1>;
 			enable-method = "allwinner,sun8i-a83t-smp";
 			reg = <0x102>;
+			#cooling-cells = <2>;
 		};
 
 		cpu@103 {
@@ -134,6 +141,7 @@
 			cci-control-port = <&cci_control1>;
 			enable-method = "allwinner,sun8i-a83t-smp";
 			reg = <0x103>;
+			#cooling-cells = <2>;
 		};
 	};
 
-- 
2.21.0