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From: Billy Tsai <billy_tsai@aspeedtech.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>, "jdelvare@suse.com"
	<jdelvare@suse.com>, "linux@roeck-us.net" <linux@roeck-us.net>,
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	<u.kleine-koenig@pengutronix.de>, "p.zabel@pengutronix.de"
	<p.zabel@pengutronix.de>, "naresh.solanki@9elements.com"
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	<linux-pwm@vger.kernel.org>, BMC-SW <BMC-SW@aspeedtech.com>,
	"patrick@stwcx.xyz" <patrick@stwcx.xyz>
Subject: Re: [PATCH v12 1/3] dt-bindings: hwmon: fan: Add fan binding to
 schema
Thread-Topic: [PATCH v12 1/3] dt-bindings: hwmon: fan: Add fan binding to
 schema
Thread-Index: AQHaQgZu5E6zHIhZfEy632aEYqumvLDapZqAgAEmR1s=
Date: Tue, 16 Jan 2024 03:09:59 +0000
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References: <20240108074348.735014-1-billy_tsai@aspeedtech.com>
 <20240108074348.735014-2-billy_tsai@aspeedtech.com>
 <54929342-7e06-4e39-a7e9-e5dc787406ce@linaro.org>
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> > +  pwms:=0A=
> > +    description:=0A=
> > +      PWM provider.=0A=
> > +    maxItems: 1=0A=
> > +=0A=
> > +  "#cooling-cells":=0A=
> > +    const: 2=0A=
> > +=0A=
> > +  cooling-levels:=0A=
> > +    description:=0A=
> > +      The control value which correspond to thermal cooling states.=0A=
> > +    $ref: /schemas/types.yaml#/definitions/uint32-array=0A=
> > +=0A=
> > +  tach-ch:=0A=
> > +    description:=0A=
> > +      The tach channel used for the fan.=0A=
> > +    $ref: /schemas/types.yaml#/definitions/uint8-array=0A=
=0A=
> What is the tach-channel and why is it different from pwm specifier?=0A=
=0A=
Hi Krzysztof,=0A=
=0A=
Using the Aspeed SoC as an example, our SoC features 16 PWMs and 16 tachome=
ter channels that can be employed to control and monitor fans.=0A=
The "tach-ch" parameter is utilized to specify which tachometer channel is =
being used to monitor a specific fan.=0A=
The "pwms" parameter is utilized to specify which pwm channel is being used=
 to control a specific fan.=0A=
=0A=
Thanks=0A=
Best regards,=0A=
Billy Tsai=0A=