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From:   Ben Tseng <ben.tseng@mediatek.com>
To:     Fan Chen <fan.chen@mediatek.com>, Zhang Rui <rui.zhang@intel.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        <linux-pm@vger.kernel.org>, <srv_heupstream@mediatek.com>
CC:     Eduardo Valentin <edubezval@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        <hsinyi@chromium.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-mediatek@lists.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@mediatek.com>,
        Michael Kao <michael.kao@mediatek.com>,
        Ben Tseng <ben.tseng@mediatek.com>
Subject: [PATCH v3] arm64: dts: mt8183-kukui: Add tboard thermal zones
Date:   Fri, 4 Jun 2021 17:37:55 +0800
Message-ID: <20210604093755.13288-1-ben.tseng@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

From: Michael Kao <michael.kao@mediatek.com>

Add tboard thermal zones.
The tboard thermal sensors are a kind of NTC sensors which are located
on PCB board to correlate the temperature of the case (Tskin).

pull-up voltage: 1800 mv
pull-up resistor: 75K

Vsense = pull-up voltage * Rntc / ( pull-up resistor + Rntc )
AuxIn = Vsense * 4096 / 1500

Signed-off-by: Michael Kao <michael.kao@mediatek.com>
Signed-off-by: Ben Tseng <ben.tseng@mediatek.com>
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>

---
Change in v3:
        - Modify Tboard to tbaord in mt8183-kukui.dtsi
        - Add more description about tboard thermal sensor

Change in v2:
        - Rebase to kernel-v5.13-rc1
        - Resend
---
 arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 14 ++++++++++++++
 arch/arm64/boot/dts/mediatek/mt8183.dtsi       |  2 +-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
index ff56bcf..601f866 100644
--- a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
@@ -847,6 +847,20 @@
 	status = "okay";
 };
 
+&thermal_zones {
+	tboard1 {
+		polling-delay = <1000>; /* milliseconds */
+		polling-delay-passive = <0>; /* milliseconds */
+		thermal-sensors = <&tboard_thermistor1>;
+	};
+
+	tboard2 {
+		polling-delay = <1000>; /* milliseconds */
+		polling-delay-passive = <0>; /* milliseconds */
+		thermal-sensors = <&tboard_thermistor2>;
+	};
+};
+
 &u3phy {
 	status = "okay";
 };
diff --git a/arch/arm64/boot/dts/mediatek/mt8183.dtsi b/arch/arm64/boot/dts/mediatek/mt8183.dtsi
index c5e822b..4173a5d 100644
--- a/arch/arm64/boot/dts/mediatek/mt8183.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8183.dtsi
@@ -673,7 +673,7 @@
 			nvmem-cell-names = "calibration-data";
 		};
 
-		thermal-zones {
+		thermal_zones: thermal-zones {
 			cpu_thermal: cpu_thermal {
 				polling-delay-passive = <100>;
 				polling-delay = <500>;
-- 
1.8.1.1.dirty