Re: [PATCH v2] dt-bindings: mips: lantiq: Document lantiq dcdc binding

Conor Dooley
2025-08-15T16:49:00Z

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On Fri, Aug 15, 2025 at 06:46:21PM +0200, Aleksander Jan Bajkowski wrote:
>
> On 8/15/25 17:48, Conor Dooley wrote:
> > On Fri, Aug 15, 2025 at 12:13:41PM +0200, Aleksander Jan Bajkowski wrote:
> > > Hi Conor,
> > >
> > > On 8/14/25 22:48, Conor Dooley wrote:
> > > > On Thu, Aug 14, 2025 at 10:26:56AM +0200, Aleksander Jan Bajkowski wrote:
> > > > > Lantiq DCDC is a voltage converter with a voltage sensor.
> > > > >
> > > > > Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
> > > > > ---
> > > > > .../mips/lantiq/lantiq,dcdc-xrx200.yaml | 32 +++++++++++++++++++
> > > > > 1 file changed, 32 insertions(+)
> > > > > create mode 100644 Documentation/devicetree/bindings/mips/lantiq/lantiq,dcdc-xrx200.yaml
> > > > >
> > > > > diff --git a/Documentation/devicetree/bindings/mips/lantiq/lantiq,dcdc-xrx200.yaml b/Documentation/devicetree/bindings/mips/lantiq/lantiq,dcdc-xrx200.yaml
> > > > > new file mode 100644
> > > > > index 000000000000..5648b9676b3c
> > > > > --- /dev/null
> > > > > +++ b/Documentation/devicetree/bindings/mips/lantiq/lantiq,dcdc-xrx200.yaml
> > > > > @@ -0,0 +1,32 @@
> > > > > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > > > > +%YAML 1.2
> > > > > +---
> > > > > +$id: http://devicetree.org/schemas/mips/lantiq/lantiq,dcdc-xrx200.yaml#
> > > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > > +
> > > > > +title: Lantiq DCDC (DC-DC converter with voltage sensor)
> > > > > +
> > > > > +maintainers:
> > > > > + - Aleksander Jan Bajkowski <olek2@wp.pl>
> > > > > +
> > > > > +properties:
> > > > > + compatible:
> > > > > + items:
> > > > > + - enum:
> > > > > + - lantiq,dcdc-xrx200
> > > > What is "xrx2000" in this context?
> > >
> > > “xrx200” is one of the generations of Lantiq SoCs. It includes four part
> > > numbers
> > > with the same memory map. The other generations are amazon-se, danube,
> > > ARX100,
> > > GRX100, xRX200, xRX300, xRX330. These correspond to the internal code names:
> > > ase,
> > > danube, ar9, gr9, vr9, ar10, grx390.
> > And the dc-dc converter is part of the SoC?
> > Either way, you've got this file in the wrong location probably, dc-dc
> > converters are usually under the regulator directory.
>
>
> The converter is inside the SoC. This driver only reads the voltage and
> prints it at startup. The voltage supplied by this converter powers one
> of the power domains. It powers the CPU core and probably other
> peripherals as well. The voltage is programmed by the bootloader and
> Linux never touches it.

Okay cool, compatible is fine then :) The location change and more
information (like what you've given here) in the description are still
needed though unfortunately for you.