The NVIDIA Tegra186 SoC has a Tachometer Controller that analyzes the
PWM signal of a Fan and reports the period value through pwm interface.
Signed-off-by: Rajkumar Rampelli <rrajk@xxxxxxxxxx>
---
arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts | 5 +++++
arch/arm64/boot/dts/nvidia/tegra186.dtsi | 11 +++++++++++
2 files changed, 16 insertions(+)
diff --git a/arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts b/arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts
index bd5305a..13c3e59 100644
--- a/arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts
+++ b/arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts
@@ -172,4 +172,9 @@
vin-supply = <&vdd_5v0_sys>;
};
};
+
+ tachometer@39c0000 {
+ nvidia,pulse-per-rev = <2>;
+ nvidia,capture-window-len = <2>;
+ };
};
diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
index b762227..8f2d598 100644
--- a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
@@ -1031,4 +1031,15 @@
(GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
interrupt-parent = <&gic>;
};
+
+ tegra_tachometer: tachometer@39c0000 {
+ compatible = "nvidia,tegra186-pwm-tachometer";
+ reg = <0x0 0x039c0000 0x0 0x10>;
+ #pwm-cells = <2>;
+ clocks = <&bpmp TEGRA186_CLK_TACH>;
+ clock-names = "tachometer";
+ resets = <&bpmp TEGRA186_RESET_TACH>;
+ reset-names = "tachometer";
+ status = "disabled";
+ };
};
--
2.1.4
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