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Subject: Re: [PATCH v7 1/3] dt-bindings: pinctrl: Add
 aspeed,ast2700-soc0-pinctrl
Thread-Topic: [PATCH v7 1/3] dt-bindings: pinctrl: Add
 aspeed,ast2700-soc0-pinctrl
Thread-Index: AQHczXLoc0DWafBAUU23YFhFi4LfGrXh15uAgACsm2Q=
Date: Fri, 17 Apr 2026 02:20:25 +0000
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References: <20260416-upstream_pinctrl-v7-0-d72762253163@aspeedtech.com>
 <20260416-upstream_pinctrl-v7-1-d72762253163@aspeedtech.com>
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> > +=A0=A0=A0=A0=A0 pins:=0A=
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> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0 - AB13=0A=
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0 - AB14=0A=
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0 - AC13=0A=
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0 - AC14=0A=
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0 - AD13=0A=
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0 - AD14=0A=
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0 - AE13=0A=
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0 - AE14=0A=
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0 - AE15=0A=
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0 - AF13=0A=
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0 - AF14=0A=
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0 - AF15=0A=
=0A=
> Why do you have groups and pins?=0A=
=0A=
> Is it valid in your device to have groups and pins in the same node?=0A=
=0A=
The intent is to support both group-based mux selection and=0A=
configuration, as well as per-pin configuration.=0A=
=0A=
In our hardware:=0A=
=0A=
- `function` + `groups` are used for pinmux selection.=0A=
- `pins` is used for per-pin configuration (e.g. drive strength,=0A=
  bias settings).=0A=
- `groups` may also be used for group-level configuration.=0A=
=0A=
As a result, both `groups` and `pins` may appear in the same node,=0A=
but they serve different purposes and do not conflict:=0A=
=0A=
- `groups` selects the mux function and may apply configuration to=0A=
  the entire group.=0A=
- `pins` allows overriding or specifying configuration for individual=0A=
  pins.=0A=
=0A=
In most cases, only one of them is needed, but both are allowed when=0A=
both group-level and per-pin configuration are required.=0A=
=0A=
Thanks=0A=
Billy Tsai=0A=