linux-kernel - Re: [PATCH v2 RESEND 1/5] dt-bindings: soc: samsung: Add Exynos USI bindings

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Date:   Wed, 1 Dec 2021 10:19:47 -0600
From:   Rob Herring <robh@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Sam Protsenko <semen.protsenko@...aro.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-samsung-soc@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Chanho Park <chanho61.park@...sung.com>,
        linux-serial@...r.kernel.org,
        Youngmin Nam <youngmin.nam@...sung.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        David Virag <virag.david003@...il.com>,
        Jaewon Kim <jaewon02.kim@...sung.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 RESEND 1/5] dt-bindings: soc: samsung: Add Exynos USI bindings

On Tue, Nov 30, 2021 at 2:04 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...onical.com> wrote:
>
> On 30/11/2021 18:43, Rob Herring wrote:
> > On Tue, 30 Nov 2021 13:13:21 +0200, Sam Protsenko wrote:
> >> Add constants for choosing USIv2 configuration mode in device tree.
> >> Those are further used in USI driver to figure out which value to write
> >> into SW_CONF register. Also document USIv2 IP-core bindings.
> >>
> >> Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
> >> ---
> >> Changes in v2:
> >>   - Combined dt-bindings doc and dt-bindings header patches
> >>   - Added i2c node to example in bindings doc
> >>   - Added mentioning of shared internal circuits
> >>   - Added USI_V2_NONE value to bindings header
> >>
> >>  .../bindings/soc/samsung/exynos-usi.yaml      | 135 ++++++++++++++++++
> >>  include/dt-bindings/soc/samsung,exynos-usi.h  |  17 +++
> >>  2 files changed, 152 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml
> >>  create mode 100644 include/dt-bindings/soc/samsung,exynos-usi.h
> >>
> >
> > My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
> > on your patch (DT_CHECKER_FLAGS is new in v5.13):
> >
> > yamllint warnings/errors:
> >
> > dtschema/dtc warnings/errors:
> > Documentation/devicetree/bindings/soc/samsung/exynos-usi.example.dts:35.39-42.15: Warning (unique_unit_address): /example-0/usi@...200c0/serial@...20000: duplicate unit-address (also used in node /example-0/usi@...200c0/i2c@...20000)
>
> Rob,
>
> The checker complains about two nodes with same unit-address, even
> though the node name is different. Does it mean that our idea of
> embedding two children in USI and having enabled only one (used one) is
> wrong?

IIRC, we allow for this exact scenario, and there was a change in dtc
for it. So I'm not sure why this triggered.

Rob