linux-kernel - [PATCH 02/10] dt-bindings: Tegra186 tachometer device tree bindings

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Date:   Wed, 21 Feb 2018 12:28:51 +0530
From:   Rajkumar Rampelli <rrajk@...dia.com>
To:     <robh+dt@...nel.org>, <mark.rutland@....com>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <jdelvare@...e.com>, <linux@...ck-us.net>, <corbet@....net>,
        <catalin.marinas@....com>, <will.deacon@....com>,
        <kstewart@...uxfoundation.org>, <gregkh@...uxfoundation.org>,
        <pombredanne@...b.com>, <mmaddireddy@...dia.com>,
        <mperttunen@...dia.com>, <arnd@...db.de>,
        <gregory.clement@...e-electrons.com>, <timur@...eaurora.org>,
        <andy.gross@...aro.org>, <xuwei5@...ilicon.com>,
        <elder@...aro.org>, <heiko@...ech.de>, <krzk@...nel.org>,
        <ard.biesheuvel@...aro.org>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pwm@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-hwmon@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <ldewangan@...dia.com>,
        <rrajk@...dia.com>
Subject: [PATCH 02/10] dt-bindings: Tegra186 tachometer device tree bindings

Supply Device tree binding documentation for the NVIDIA
Tegra186 SoC's Tachometer Controller

Signed-off-by: Rajkumar Rampelli <rrajk@...dia.com>
---
 .../bindings/pwm/pwm-tegra-tachometer.txt          | 31 ++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/pwm-tegra-tachometer.txt

diff --git a/Documentation/devicetree/bindings/pwm/pwm-tegra-tachometer.txt b/Documentation/devicetree/bindings/pwm/pwm-tegra-tachometer.txt
new file mode 100644
index 0000000..4a7ead4
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/pwm-tegra-tachometer.txt
@@ -0,0 +1,31 @@
+Bindings for a PWM based Tachometer driver
+
+Required properties:
+- compatible: Must be "nvidia,tegra186-pwm-tachometer"
+- reg: physical base addresses of the controller and length of
+  memory mapped region.
+- #pwm-cells: should be 2. See pwm.txt in this directory for a
+  description of the cells format.
+- clocks: phandle list of tachometer clocks
+- clock-names: should be "tachometer". See clock-bindings.txt in documentations
+- resets: phandle to the reset controller for the Tachometer IP
+- reset-names: should be "tachometer". See reset.txt in documentations
+- nvidia,pulse-per-rev: Integer, pulses per revolution of a Fan. This value
+  obtained from Fan specification document.
+- nvidia,capture-window-len: Integer, window of the Fan Tach monitor, it indicates
+  that how many period of the input fan tach signal will the FAN TACH logic
+  monitor. Valid values are 1, 2, 4 and 8 only.
+
+Example:
+	tegra_tachometer: tachometer@...0000 {
+		compatible = "nvidia,tegra186-pwm-tachometer";
+		reg = <0x0 0x039c0000 0x0 0x10>;
+		#pwm-cells = <2>;
+		clocks = <&tegra_car TEGRA186_CLK_TACH>;
+		clock-names = "tachometer";
+		resets = <&tegra_car TEGRA186_RESET_TACH>;
+		reset-names = "tachometer";
+		nvidia,pulse-per-rev = <2>;
+		nvidia,capture-window-len = <2>;
+		status = "disabled";
+	};
-- 
2.1.4