linux-kernel - Re: [v5 3/5] dt-bindings: mfd: Add aspeed pwm-tach binding

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Date:   Wed, 7 Jun 2023 20:26:38 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Billy Tsai <billy_tsai@...eedtech.com>,
        Patrick Williams <patrick@...cx.xyz>
Cc:     "jdelvare@...e.com" <jdelvare@...e.com>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "joel@....id.au" <joel@....id.au>,
        "andrew@...id.au" <andrew@...id.au>,
        "lee@...nel.org" <lee@...nel.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "corbet@....net" <corbet@....net>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [v5 3/5] dt-bindings: mfd: Add aspeed pwm-tach binding

On 07/06/2023 08:26, Billy Tsai wrote:
>> Missing description. But more important - why do you have such child
>> nodes? Your example does not have them. What's the point? Do you expect
>> different number of fans per one device (one compatible)?
> 
> In this patch series, I have included examples and descriptions to provide additional information.
> The child node is used to enable the channel of this tach controller.


Children are not for this. Look for cells examples (e.g. gpio-cells,
pwm-cells). It seems this is the same as Nuvoton NCT7362Y, so no. Don't
use reg for that purpose.

Best regards,
Krzysztof