linux-kernel - Re: [PATCH v5 05/10] ARM: dts: aspeed: catalina: Add second source fan controller support

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Message-ID: <26a1d17c47c5ca6036dd58ac3b953daeec9f5ef8.camel@codeconstruct.com.au>
Date: Fri, 21 Mar 2025 11:47:22 +1030
From: Andrew Jeffery <andrew@...econstruct.com.au>
To: Potin Lai <potin.lai.pt@...il.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski
	 <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Joel Stanley
	 <joel@....id.au>, Patrick Williams <patrick@...cx.xyz>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org, Cosmo Chou
	 <cosmo.chou@...ntatw.com>, Potin Lai <potin.lai@...ntatw.com>
Subject: Re: [PATCH v5 05/10] ARM: dts: aspeed: catalina: Add second source
 fan controller support

Hi Potin,

On Thu, 2025-03-20 at 23:21 +0800, Potin Lai wrote:
> Add device tree nodes for the NCT7363 fan controllers on the second-
> source
> Power Distribution Board (PDB).
> 
> Signed-off-by: Potin Lai <potin.lai.pt@...il.com>
> ---
>  .../dts/aspeed/aspeed-bmc-facebook-catalina.dts    | 76
> ++++++++++++++++++++++
>  1 file changed, 76 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-
> catalina.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-
> catalina.dts
> index fd22add90449..9cbb296dcd9e 100644
> --- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-catalina.dts
> +++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-catalina.dts
> @@ -467,6 +467,82 @@ i2c1mux0ch2: i2c@2 {
>                         #size-cells = <0>;
>                         reg = <0x2>;
>  
> +                       hwmon0: hwmon@1 {

There might be instances of calling nodes and labels 'hwmon' in other
(BMC) devicetrees, but I don't think we should continue that practice.
I think in this case it should be 'fan-controller'.

hwmon is the name of a kernel subsystem, not a class of hardware. The
devicetrees should describe the hardware (and not concepts from the
kernel).


> +                               compatible = "nuvoton,nct7363";
> +                               reg = <0x01>;
> +                               #pwm-cells = <2>;
> +
> +                               fan-9 {
> +                                       pwms = <&hwmon0 0 40000>;
> +                                       tach-ch = /bits/ 8 <0x09>;
> +                               };
> +                               fan-11 {
> +                                       pwms = <&hwmon0 0 40000>;
> +                                       tach-ch = /bits/ 8 <0x0b>;
> +                               };
> +                               fan-10 {
> +                                       pwms = <&hwmon0 4 40000>;
> +                                       tach-ch = /bits/ 8 <0x0a>;
> +                               };
> +                               fan-13 {
> +                                       pwms = <&hwmon0 4 40000>;
> +                                       tach-ch = /bits/ 8 <0x0d>;
> +                               };
> +                               fan-15 {
> +                                       pwms = <&hwmon0 6 40000>;
> +                                       tach-ch = /bits/ 8 <0x0f>;
> +                               };
> +                               fan-1 {
> +                                       pwms = <&hwmon0 6 40000>;
> +                                       tach-ch = /bits/ 8 <0x01>;
> +                               };
> +                               fan-0 {
> +                                       pwms = <&hwmon0 10 40000>;
> +                                       tach-ch = /bits/ 8 <0x00>;
> +                               };
> +                               fan-3 {
> +                                       pwms = <&hwmon0 10 40000>;
> +                                       tach-ch = /bits/ 8 <0x03>;
> +                               };
> +                       };
> +                       hwmon1: hwmon@2 {

As above.

Andrew