linux-kernel - Re: [PATCH v12 2/3] dt-bindings: hwmon: Support Aspeed g6 PWM TACH Control

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Message-ID:
 <OSQPR06MB725208AEF8779B0BC971DFF48B6C2@OSQPR06MB7252.apcprd06.prod.outlook.com>
Date: Mon, 15 Jan 2024 07:05:43 +0000
From: Billy Tsai <billy_tsai@...eedtech.com>
To: Rob Herring <robh@...nel.org>
CC: "jdelvare@...e.com" <jdelvare@...e.com>, "linux@...ck-us.net"
	<linux@...ck-us.net>, "krzysztof.kozlowski+dt@...aro.org"
	<krzysztof.kozlowski+dt@...aro.org>, "joel@....id.au" <joel@....id.au>,
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	"p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
	"naresh.solanki@...ements.com" <naresh.solanki@...ements.com>,
	"linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
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	<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-doc@...r.kernel.org"
	<linux-doc@...r.kernel.org>, "linux-pwm@...r.kernel.org"
	<linux-pwm@...r.kernel.org>, BMC-SW <BMC-SW@...eedtech.com>,
	"patrick@...cx.xyz" <patrick@...cx.xyz>
Subject: Re: [PATCH v12 2/3] dt-bindings: hwmon: Support Aspeed g6 PWM TACH
 Control

> > Document the compatible for aspeed,ast2600-pwm-tach device, which can
> > support up to 16 PWM outputs and 16 fan tach input.
> >
> > Signed-off-by: Billy Tsai <billy_tsai@...eedtech.com>
> > ---
> >  .../bindings/hwmon/aspeed,g6-pwm-tach.yaml    | 69 +++++++++++++++++++
> >  1 file changed, 69 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tachyaml b/Documentation/> devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml
> > new file mode 100644
> > index 000000000000..c615fb10705c
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml
> > @@ -0,0 +1,69 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +# Copyright (C) 2023 Aspeed, Inc.
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/hwmon/aspeed,g6-pwm-tach.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: ASPEED G6 PWM and Fan Tach controller
> > +
> > +maintainers:
> > +  - Billy Tsai <billy_tsai@...eedtech.com>
> > +
> > +description: |
> > +  The ASPEED PWM controller can support up to 16 PWM outputs.
> > +  The ASPEED Fan Tacho controller can support up to 16 fan tach input.
> > +  They are independent hardware blocks, which are different from the
> > +  previous version of the ASPEED chip.
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - aspeed,ast2600-pwm-tach
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  resets:
> > +    maxItems: 1
> > +
> > +  "#pwm-cells":
> > +    const: 3
> > +
> > +patternProperties:
> > +  "^fan-[0-9]+$":
> > +    $ref: fan-common.yaml#
> > +    unevaluatedProperties: false
> > +    required:
> > +      - tach-ch
> > +
> > +required:
> > +  - reg
> > +  - clocks
> > +  - resets
> > +  - "#pwm-cells"
> > +  - compatible
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/clock/aspeed-clock.h>
> > +    pwm_tach: pwm-tach-controller@...10000 {
> > +      compatible = "aspeed,ast2600-pwm-tach";
> > +      reg = <0x1e610000 0x100>;
> > +      clocks = <&syscon ASPEED_CLK_AHB>;
> > +      resets = <&syscon ASPEED_RESET_PWM>;
> > +      #pwm-cells = <3>;
> > +
> > +      fan-0 {
> > +        tach-ch = /bits/ 8 <0x0>;
> > +      };
> > +
> > +      fan-1 {
> > +        tach-ch = /bits/ 8 <0x1 0x2>;
> > +      };

> NAK on this based on how you are using pwm-fan in v10 discussion. See my
> comments there.

Okay, I will merge everything from the pwm-fan0 node into the fan-0 node
and add the 'simple-bus' to the compatible string of the pwm_tach node.

Thanks

Billy Tsai