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Message-ID: <20190130172815.GC14781@roeck-us.net>
Date: Wed, 30 Jan 2019 09:28:15 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Stefan Wahren <stefan.wahren@...e.com>
Cc: Kamil Debski <kamil@...as.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Jean Delvare <jdelvare@...e.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 1/3] dt-bindings: hwmon: Add tachometer interrupt to
pwm-fan
On Wed, Jan 30, 2019 at 04:07:05PM +0100, Stefan Wahren wrote:
> This adds the tachometer interrupt to the pwm-fan binding, which is
> necessary for RPM support.
>
> Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
> ---
> Documentation/devicetree/bindings/hwmon/pwm-fan.txt | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
> index 49ca5d8..7f69b0b 100644
> --- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
> +++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
> @@ -8,6 +8,9 @@ Required properties:
>
> Optional properties:
> - fan-supply : phandle to the regulator that provides power to the fan
> +- interrupts : contains a single interrupt specifier which describes the
> + tachometer pin output of a 2 pulse-per-revolution fan.
> + See interrupt-controller/interrupts.txt for the format.
So a hypothetical {1,4} pulse-per-revolution fan would explicitly not be
supported ? Why ?
Guenter
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