linux-kernel - Re: [PATCH v7 1/2] dt-bindings: hwmon: Support Aspeed g6 PWM TACH Control

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Message-ID: <CABqG17g-s4h810JO-MO_TRRJhPkP=RMLDm7Jq6Sx4Gm1hRKqLg@mail.gmail.com>
Date:   Mon, 28 Aug 2023 13:23:33 +0530
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     Billy Tsai <billy_tsai@...eedtech.com>
Cc:     Rob Herring <robh@...nel.org>,
        "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>,
        "andrew@...id.au" <andrew@...id.au>,
        "corbet@....net" <corbet@....net>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "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-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>,
        Luke Chen <luke_chen@...eedtech.com>
Subject: Re: [PATCH v7 1/2] dt-bindings: hwmon: Support Aspeed g6 PWM TACH Control

Hi Billy,


On Mon, 28 Aug 2023 at 09:33, Billy Tsai <billy_tsai@...eedtech.com> wrote:
>
> On Thu, Aug 17, 2023 at 08:00:28PM +0800, Billy Tsai wrote:
>
> >> Document the compatible for aspeed,ast2600-pwm-tach device, which can
>
> >> support upto 16 PWM outputs and 16 fan tach input.
>
> >>
>
> >> Signed-off-by: Billy Tsai <billy_tsai@...eedtech.com>
>
> >> ---
>
> >>  .../bindings/hwmon/aspeed,g6-pwm-tach.yaml    | 57 +++++++++++++++++++
>
> >>  1 file changed, 57 insertions(+)
>
> >>  create mode 100644 Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml
>
> >>
>
> >> diff --git a/Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml b/Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml
>
> >> new file mode 100644
>
> >> index 000000000000..1666304d0b0f
>
> >> --- /dev/null
>
> >> +++ b/Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml
>
> >> @@ -0,0 +1,57 @@
>
> >> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>
> >> +# Copyright (C) 2021 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 device driver
>
> >> +
>
> >> +maintainers:
>
> >> +  - Billy Tsai <billy_tsai@...eedtech.com>
>
> >> +
>
> >> +description: |
>
> >> +  The ASPEED PWM controller can support upto 16 PWM outputs.
>
> >> +  The ASPEED Fan Tacho controller can support upto 16 fan tach input.
>
> >> +
>
> >> +properties:
>
> >> +  compatible:
>
> >> +    enum:
>
> >> +      - aspeed,ast2600-pwm-tach
>
> >> +
>
> >> +  reg:
>
> >> +    maxItems: 1
>
> >> +
>
> >> +  clocks:
>
> >> +    maxItems: 1
>
> >> +
>
> >> +  resets:
>
> >> +    maxItems: 1
>
> >> +
>
> >> +  "#pwm-cells":
>
> >> +    const: 3
>
> >> +
>
> >> +  aspeed,fan-tach-ch:
>
> >> +    description: Specify the Fan tach input channels.
>
> >> +    $ref: "/schemas/types.yaml#/definitions/uint8-array"
>
>
>
> >This property is already defined in aspeed-pwm-tacho.txt as a single u8
>
> >that goes in a fan node. You can't redefine its type and location here.
>
>
>
> Hi Rob,
>
>
>
> I didn't redefine the type of property. The type of the aspeed,fan-tach-ch is unit8-array
>
> in aspeed-pwm-tacho.txt.
>
> https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/hwmon/aspeed-pwm-tacho.txt#L48
>
> https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/hwmon/aspeed-pwm-tacho.txt#L71
>
>
>
> >To repeat what I've said in previous versions, work with others to
>
> >define a common fan and fan controller binding. Otherwise, anything new
>
> >with fan related properties is simply going to be rejected.
>
>
>
> Okay I will try to work with Naresh for defining a common fan binding.
>
>
>
> Thanks for your suggestion.
>
>
>
> Hi Naresh,
>
>
>
> As Rob mentioned, it would be advisable for my dt-bindings to reference the common fan bindings instead of introducing specific properties.
>
> I noticed that you have already submitted a related patch to the community, which seems to be pending for around 10 months.
>
> https://lore.kernel.org/lkml/20221116213615.1256297-2-Naresh.Solanki@9elements.com/
>
> Do you have plans to send the next version of the patch? Alternatively, can I proceed to cherry-pick this version of the patch and continue with
>
> the upstreaming process in my patch serial?
Sure, go ahead.

Regards,
Naresh
>
>
>
> Thanks
>
> Best Regards,
>
> Billy Tsai