linux-kernel - Re: [PATCH v2 2/4] dt-bindings: arm: mediatek: Add new bindings of MediaTek frequency hopping

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Message-ID: <2179d4fd670b6035b38eff3daa21a39fb25b234a.camel@mediatek.com>
Date:   Wed, 28 Sep 2022 06:18:07 +0000
From:   Johnson Wang (王聖鑫) 
        <Johnson.Wang@...iatek.com>
To:     "sboyd@...nel.org" <sboyd@...nel.org>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Edward-JW Yang (楊哲維) 
        <Edward-JW.Yang@...iatek.com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] dt-bindings: arm: mediatek: Add new bindings of
 MediaTek frequency hopping

Hi Krzysztof,

Sorry for the late reply.
Thanks for your review.

On Sun, 2022-09-18 at 10:38 +0100, Krzysztof Kozlowski wrote:
> On 14/09/2022 13:45, Johnson Wang wrote:
> > Add the new binding documentation for MediaTek frequency hopping
> > and spread spectrum clocking control.
> > 
> > Co-developed-by: Edward-JW Yang <edward-jw.yang@...iatek.com>
> > Signed-off-by: Edward-JW Yang <edward-jw.yang@...iatek.com>
> > Signed-off-by: Johnson Wang <johnson.wang@...iatek.com>
> > ---
> >  .../bindings/arm/mediatek/mediatek,fhctl.yaml | 47
> > +++++++++++++++++++
> >  1 file changed, 47 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yaml
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yam
> > l
> > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yam
> > l
> > new file mode 100644
> > index 000000000000..7b0fd0889bb6
> > --- /dev/null
> > +++
> > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yam
> > l
> 
> Name of file matching compatible.

I will change file name in the next version.
> 
> > @@ -0,0 +1,47 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: 
> > https://urldefense.com/v3/__http://devicetree.org/schemas/arm/mediatek/mediatek,fhctl.yaml*__;Iw!!CTRNKA9wMg0ARbw!3e-QEzJcF8ER6bi9pBinXakWUMDsurZPy-q69INHqalP_evj50meSBC7SN0ukZhfEmO-$
> >  
> > +$schema: 
> > https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!3e-QEzJcF8ER6bi9pBinXakWUMDsurZPy-q69INHqalP_evj50meSBC7SN0ukZLSg9mh$
> >  
> > +
> > +title: MediaTek frequency hopping and spread spectrum clocking
> > control
> > +
> > +maintainers:
> > +  - Edward-JW Yang <edward-jw.yang@...iatek.com>
> > +
> > +description: |
> > +  Frequency hopping control (FHCTL) is a piece of hardware that
> > control
> > +  some PLLs to adopt "hopping" mechanism to adjust their
> > frequency.
> > +  Spread spectrum clocking (SSC) is another function provided by
> > this hardware.
> > +
> > +properties:
> > +  compatible:
> > +    const: mediatek,mt8186-fhctl
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    description: Phandles of the PLL with FHCTL hardware
> > capability.
> 
> You need constraints here.

I will improve this in the next version.

> 
> > +
> > +  mediatek,hopping-ssc-percents:
> 
> That's not the correct unit suffix name.
> 
https://urldefense.com/v3/__https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/property-units.yaml__;!!CTRNKA9wMg0ARbw!3e-QEzJcF8ER6bi9pBinXakWUMDsurZPy-q69INHqalP_evj50meSBC7SN0ukaKEhFnN$

I will go with "mediatek,hopping-ssc-percent" in the next version.

Thanks!

BRs,
Johnson Wang
>  
> 
> 
> > +    description: The percentage of spread spectrum clocking for
> > one PLL.
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> 
> Best regards,
> Krzysztof