linux-kernel - Re: [PATCH v8 2/8] dt-bindings: phy: qcom,qmp-usb: Add IPQ9574 USB3 PHY

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Date:   Fri, 21 Apr 2023 15:28:39 +0530
From:   Varadarajan Narayanan <quic_varada@...cinc.com>
To:     Johan Hovold <johan@...nel.org>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <vkoul@...nel.org>,
        <kishon@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <gregkh@...uxfoundation.org>,
        <mturquette@...libre.com>, <sboyd@...nel.org>,
        <quic_wcheng@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <linux-phy@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v8 2/8] dt-bindings: phy: qcom,qmp-usb: Add IPQ9574 USB3
 PHY

On Mon, Apr 17, 2023 at 10:05:11AM +0200, Johan Hovold wrote:
> On Thu, Apr 06, 2023 at 09:41:49AM +0200, Krzysztof Kozlowski wrote:
> > On 05/04/2023 13:41, Varadarajan Narayanan wrote:
> > > Add dt-bindings for USB3 PHY found on Qualcomm IPQ9574
> > >
> > > Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> > > ---
> > >  Changes in v8:
> > > 	- Update clock names for ipq9574
> > >
> > >  Changes in v6:
> > > 	- Made power-domains optional
> > >
> > > Note: In the earlier patch sets, had used the (legacy)
> > > specification available in qcom,msm8996-qmp-usb3-phy.yaml. Moved
> > > to newer specification in qcom,sc8280xp-qmp-usb3-uni-phy.yaml
> > > ---
> > >  .../phy/qcom,sc8280xp-qmp-usb3-uni-phy.yaml        | 43 +++++++++++++++++++---
> > >  1 file changed, 37 insertions(+), 6 deletions(-)
>
> > > +        clock-names:
> > > +          items:
> > > +            - const: aux
> > > +            - const: ref
> > > +            - const: com_aux
> >
> > Can anyone explain me why do we name these (here and other Qualcomm
> > bindings) based on clock name, not input? Just because different clock
> > is fed to the block, does not necessarily mean the input should be named
> > differently.
>
> I guess part of the answer is that this has just been copied from the
> vendor dts and (almost) no one but Qualcomm has access to the
> documentation. What would the input names be here?
>
> Also note that there are SoCs that enable both 'cfg_ahb' and 'com_aux'
> (e.g. sc7180).

The clock name definitions are auto-generated based on the clock
tree definitions provided by the h/w team. We followed the naming
pattern done in the previous SoCs.

Thanks
Varada

>
> > > +            - const: pipe
> > > +
> > >  examples:
> > >    - |
> > >      #include <dt-bindings/clock/qcom,gcc-sc8280xp.h>
>
> Johan