Re: [PATCH 6/6] arm64: dts: ls1028a-rdb: Add a spidev node for the mikroBUS

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Am 2020-03-09 19:50, schrieb Vladimir Oltean:
On Mon, 9 Mar 2020 at 20:35, Michael Walle <michael@xxxxxxxx> wrote:

Am 2020-03-09 15:56, schrieb Vladimir Oltean:
> From: Vladimir Oltean <vladimir.oltean@xxxxxxx>
>
> For debugging, it is useful to have access to the DSPI controller
> signals. On the reference design board, these are exported to either
> the
> mikroBUS1 or mikroBUS2 connector (according to the CPLD register
> BRDCFG3[SPI3]).
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>
> ---
>  arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts
> b/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts
> index bb7ba3bcbe56..43f403b30dae 100644
> --- a/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts
> +++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts
> @@ -83,6 +83,20 @@
>       };
>  };
>
> +&dspi2 {
> +     bus-num = <2>;
> +     status = "okay";
> +
> +     /* mikroBUS1 */
> +     spidev@0 {
> +             compatible = "spidev";

As far as I know this throws a warning at boot that you
shouldn't use the compatible = "spidev", doesn't it?

/*
  * spidev should never be referenced in DT without a specific
  * compatible string, it is a Linux implementation thing
  * rather than a description of the hardware.
  */


If this is supposed to mean that the "spidev" string is less
adequate/expressive than "rohm,dh2228fv", then ok, I'll use that.

TBH I don't care, its your board ;) But I suppose that there is no
Rohm DH2228FV on the (pluggable) mikroBUS board. I just noticed
that compatible string. Don't shoot the messenger ;)

-michael


-michael

> +             reg = <0>;
> +             spi-max-frequency = <20000000>;
> +             fsl,spi-cs-sck-delay = <100>;
> +             fsl,spi-sck-cs-delay = <100>;
> +     };
> +};
> +
>  &esdhc {
>       sd-uhs-sdr104;
>       sd-uhs-sdr50;



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