linux-kernel - Re: [PATCH v3 1/2] dt-bindings: pinctrl: aspeed,ast2600-pinctrl: add NCSI group

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Date: Fri, 21 Jun 2024 16:53:40 +0800
From: Potin Lai <potin.lai.pt@...il.com>
To: Andrew Jeffery <andrew@...econstruct.com.au>
Cc: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Joel Stanley <joel@....id.au>, linux-aspeed@...ts.ozlabs.org, openbmc@...ts.ozlabs.org, 
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Patrick Williams <patrick@...cx.xyz>, Cosmo Chou <cosmo.chou@...ntatw.com>, 
	Potin Lai <potin.lai@...ntatw.com>, 
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v3 1/2] dt-bindings: pinctrl: aspeed,ast2600-pinctrl: add
 NCSI group

On Fri, Jun 21, 2024 at 8:46 AM Andrew Jeffery
<andrew@...econstruct.com.au> wrote:
>
> Hi Potin,
>
> On Thu, 2024-06-20 at 16:43 +0800, Potin Lai wrote:
> > In the NCSI pin table, the reference clock output pin (RMIIXRCLKO) is not
> > needed on the management controller side.
> >
> > Add NCSI group to distinguish the pin group between RMII and NCSI.
> >
> > - RMII pins:
> >   - RMIIXRCLKI
> >   - RMIIXRXD0
> >   - RMIIXRXD1
> >   - RMIIXCRSDV
> >   - RMIIXRXER
> >   - RMIIXRCLKO
> >   - RMIIXTXEN
> >   - RMIIXTXD0
> >   - RMIIXTXD1
> >
> > - NCSI pins:
> >   - RMIIXRCLKI
> >   - RMIIXRXD0
> >   - RMIIXRXD1
> >   - RMIIXCRSDV
> >   - RMIIXRXER
> >   - RMIIXTXEN
> >   - RMIIXTXD0
> >   - RMIIXTXD1
>
> I think listing all the pins for both groups obscures the fact that
> there aren't more changes than removing RMIIXRCLKO.
>
> Can we instead drop these lists and replace
>
> > Add NCSI group to distinguish the pin group between RMII and NCSI.
>
> With:
>
> > Add "NCSI" pin groups that are equivalent to the RMII pin groups,
> > but without the RMIIXRCLKO pin
>
> ?
>
Got it, will update it in the next version.

> >
> > Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> > Signed-off-by: Potin Lai <potin.lai.pt@...il.com>
> > ---
> >  .../devicetree/bindings/pinctrl/aspeed,ast2600-pinctrl.yaml     | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/pinctrl/aspeed,ast2600-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/aspeed,ast2600-pinctrl.yaml
> > index 00b6974a5ed3d..3f02dc94a7ce2 100644
> > --- a/Documentation/devicetree/bindings/pinctrl/aspeed,ast2600-pinctrl.yaml
> > +++ b/Documentation/devicetree/bindings/pinctrl/aspeed,ast2600-pinctrl.yaml
> > @@ -337,6 +337,8 @@ additionalProperties:
> >          - MDIO2
> >          - MDIO3
> >          - MDIO4
> > +        - NCSI3
> > +        - NCSI4
>
> Can we also do this for RMII{1,2}RCLKO (and in the driver patch as
> well)?
>
The power of RMII{1,2} is 1.8v, which does not meet NCSI requirements.

> >          - NCTS1
> >          - NCTS2
> >          - NCTS3
>
> Overall, what I was hoping for with the comment on the earlier patch
> was that you would add the discussion in the commit message to the
> "description" entry in the binding YAML. Can you please do so? That way
> the information is always present for people reading the binding
> without them having to look at the binding's change history.
>
Got it, I will add note into aspeed,ast2600-pinctrl.yaml.

> Thanks,
>
> Andrew