linux-kernel - Re: [PATCH] dt-bindings: Only show unique unit address warning for enabled nodes

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Message-ID: <Ya5wRwx9xZX9pQBV@robh.at.kernel.org>
Date:   Mon, 6 Dec 2021 14:19:19 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sam Protsenko <semen.protsenko@...aro.org>
Cc:     Jaewon Kim <jaewon02.kim@...sung.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        David Virag <virag.david003@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        devicetree@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: Only show unique unit address warning for
 enabled nodes

On Fri, 03 Dec 2021 20:35:17 +0200, Sam Protsenko wrote:
> There are valid cases when two nodes can have the same address. For
> example, in Exynos SoCs there is USI IP-core, which might be configured
> to provide UART, SPI or I2C block, all of which having the same base
> register address. But only one can be enabled at a time. That looks like
> this:
> 
>     usi@...200c0 {
>         serial@...20000 {
>             status = "okay";
>         };
> 
>         i2c@...20000 {
>             status = "disabled";
>         };
>     };
> 
> When running "make dt_binding_check", it reports next warning:
> 
>     Warning (unique_unit_address):
>     /example-0/usi@...200c0/serial@...20000:
>     duplicate unit-address (also used in node
>     /example-0/usi@...200c0/i2c@...20000)
> 
> Disable "unique_unit_address" in DTC_FLAGS to suppress warnings like
> that, but enable "unique_unit_address_if_enabled" warning, so that dtc
> still reports a warning when two enabled nodes are having the same
> address.
> 
> Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
> Reported-by: Rob Herring <robh@...nel.org>
> Suggested-by: Rob Herring <robh@...nel.org>
> ---
>  Documentation/devicetree/bindings/Makefile | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 

Applied, thanks!