[PATCH 3/4] arm64: dts: imx8mn: Remove unreferenced clock-controller clocks in SPL DTs

[Simon Glass]

Hi Marek,

On Thu, 21 Nov 2024 at 18:59, Marek Vasut <marex at denx.de> wrote:
>
> Since 50cdd3f74af3 ("clk: imx: clk-imx8mn Fix nand and spi clock parent"),
> drivers/clk/imx/clk-imx8mn.c clk_get_by_name(dev, "osc_24m", &osc_24m_clk)
> fails with error -22 EINVAL in SPL. This is because clk_get_by_name() in the
> end calls fdtdec_parse_phandle_with_args(), which iterates over all phandles
> in clock-controller at 30380000 { clocks = <&osc_32k>, <&osc_24m>, ... } node
> 'clocks' property in an attempt to find the "osc_24m" clock, but fails to
> resolve the &osc_32k phandle and returns with -EINVAL.
>
> Remove the clocks property phandles which cannot be resolved because their
> matching nodes are removed from SPL DTs, so fdtdec_parse_phandle_with_args()
> can resolve all the remaining valid nodes and successfully look up the osc_24m
> clock.
>
> Fixes: 50cdd3f74af3 ("clk: imx: clk-imx8mn Fix nand and spi clock parent")
> Signed-off-by: Marek Vasut <marex at denx.de>
> ---
> Cc: "NXP i.MX U-Boot Team" <uboot-imx at nxp.com>
> Cc: Bryan Brattlof <bb at ti.com>
> Cc: Fabio Estevam <festevam at gmail.com>
> Cc: Greg Malysa <greg.malysa at timesys.com>
> Cc: Ian Roberts <ian.roberts at timesys.com>
> Cc: Ilias Apalodimas <ilias.apalodimas at linaro.org>
> Cc: Jonathan Humphreys <j-humphreys at ti.com>
> Cc: Masahisa Kojima <kojima.masahisa at socionext.com>
> Cc: Nathan Barrett-Morrison <nathan.morrison at timesys.com>
> Cc: Rasmus Villemoes <rasmus.villemoes at prevas.dk>
> Cc: Simon Glass <sjg at chromium.org>
> Cc: Stefano Babic <sbabic at denx.de>
> Cc: Sumit Garg <sumit.garg at linaro.org>
> Cc: Tim Harvey <tharvey at gateworks.com>
> Cc: Tom Rini <trini at konsulko.com>
> Cc: u-boot at lists.denx.de
> ---
> NOTE: For v2025.04
> ---
>  arch/arm/dts/imx8mn-u-boot.dtsi | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm/dts/imx8mn-u-boot.dtsi b/arch/arm/dts/imx8mn-u-boot.dtsi
> index 6d80d856365..38e1934aee8 100644
> --- a/arch/arm/dts/imx8mn-u-boot.dtsi
> +++ b/arch/arm/dts/imx8mn-u-boot.dtsi
> @@ -51,6 +51,10 @@
>         /delete-property/ assigned-clocks;
>         /delete-property/ assigned-clock-parents;
>         /delete-property/ assigned-clock-rates;
> +#ifdef CONFIG_SPL_BUILD
> +       clocks = <&osc_24m>;
> +       clock-names = "osc_24m";
> +#endif
>  };
>
>  #ifdef CONFIG_FSL_CAAM
> --
> 2.45.2
>

We should not be checking U-Boot CONFIG things in .dts sources, since
there is no way it could go upstream.

get_phandle_argc() shows how this is done in dtoc. It seems we will
need similar logic in fdtgrep to handle this. You'll be pleased to
hear it is written in C :-)

BTW the bootph tags should be able to go upstream and be dropped from
the .dtsi - the only thing in the dtsi these days in the Binman
definition, which is barely started upstream.

Regards,
Simon