Re: linux-next: build warnings after merge of the renesas tree

Geert Uytterhoeven <[email protected]> Tue, 6 May 2025 12:05:15 +0200

Newsgroups	org.kernel.vger.devicetree-compiler,org.kernel.vger.linux-devicetree,org.kernel.vger.linux-kernel,org.kernel.vger.linux-next
Message-ID	<CAMuHMdX_K7EA4kE2mqxv+BkfR_oQmcpek2B3LxiYxMjSMfwjAw@mail.gmail.com>

Hi Stephen,

On Tue, 6 May 2025 at 11:20, Stephen Rothwell <[email protected]> wrote:
> After merging the renesas tree, today's linux-next build (arm64 defconfig)
> produced these warnings:
>
> arch/arm64/boot/dts/renesas/r8a779g0.dtsi:1269.24-1283.5: Warning (spi_bus_bridge): /soc/spi@e6ea0000: incorrect #address-cells for SPI bus
>   also defined at arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk.dts:463.9-478.3
> arch/arm64/boot/dts/renesas/r8a779g0.dtsi:1269.24-1283.5: Warning (spi_bus_bridge): /soc/spi@e6ea0000: incorrect #size-cells for SPI bus
>   also defined at arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk.dts:463.9-478.3
> arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk.dtb: Warning (spi_bus_reg): Failed prerequisite 'spi_bus_bridge'
>
> Introduced by commit
>
>   c29748ccad88 ("arm64: dts: renesas: sparrow-hawk: Add MSIOF Sound support")

Thanks, this is a known conflict between SPI bus bindings and dtc:
  - Serial engines that can be SPI controllers must use "spi" as their
    node names,
  - Dtc assumes nodes named "spi" are always SPI controllers.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds