linux-kernel - [PATCH 04/10] hwmon: generic-pwm-tachometer: Add DT binding details

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Date:   Wed, 21 Feb 2018 12:28:53 +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 04/10] hwmon: generic-pwm-tachometer: Add DT binding details

Add DT binding details for the PWM based generic tachometer
driver which gets the period of the PWM tach-output from Fan
via PWM IP having capability of capturing the signal.

Signed-off-by: Rajkumar Rampelli <rrajk@...dia.com>
---
 .../bindings/hwmon/generic-pwm-tachometer.txt      | 25 ++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/generic-pwm-tachometer.txt

diff --git a/Documentation/devicetree/bindings/hwmon/generic-pwm-tachometer.txt b/Documentation/devicetree/bindings/hwmon/generic-pwm-tachometer.txt
new file mode 100644
index 0000000..3541fe5
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/generic-pwm-tachometer.txt
@@ -0,0 +1,25 @@
+Device tree bindings for fan tach output connected to PWM controller with
+PWM capture capability.
+
+Required properties:
+- compatible : Should be "generic-pwm-tachometer"
+- pwms       : PWM handle. Please refer pwm.txt DT binding for more details.
+
+Example:
+	tegra_tachometer: tachometer@...0000 {
+		compatible = "nvidia,tegra186-pwm-tachometer";
+		reg = <0x0 0x039c0000 0x0 0x10>;
+		clocks = <&bpmp_clks TEGRA194_CLK_TACH>;
+		clock-names = "tachometer";
+		resets = <&bpmp_resets TEGRA194_RESET_TACH>;
+		reset-names = "tachometer";
+		nvidia,pulse-per-rev = <2>;
+		nvidia,sampling-window = <2>;
+		status = "okay";
+	};
+
+	generic_pwm_tachometer {
+		compatible = "generic-pwm-tachometer";
+		pwms = <&tegra_tachometer 0 1000000>;
+		status = "okay";
+	};
-- 
2.1.4