Hi!
> [ Upstream commit 8240c972c1798ea013cbb407722295fc826b3584 ]
>
> On LS2088A-RDB board, if the spi-fsl-dspi driver is built as module
> then its probe fails with the following warning:
>
> [ 10.471363] couldn't get idr
> [ 10.471381] WARNING: CPU: 4 PID: 488 at drivers/spi/spi.c:2689 spi_register_controller+0x73c/0x8d0
> ...
> [ 10.471651] fsl-dspi 2100000.spi: Problem registering DSPI ctlr
> [ 10.471708] fsl-dspi: probe of 2100000.spi failed with error -16
>
> Reason for the failure is that bus-num property is set for dspi node.
> However, bus-num property is not set for the qspi node. If probe for
> spi-fsl-qspi happens first then id 0 is dynamically allocated to it.
> Call to spi_register_controller() from spi-fsl-dspi driver then fails.
> Since commit 29d2daf2c33c ("spi: spi-fsl-dspi: Make bus-num property
> optional") bus-num property is optional. Remove bus-num property from
> dspi node to fix the issue.
According to changelog this depends on 29d2daf2c33c. Than one is
present in 5.10-stable, but not in 4.19-stable, AFAICT.
Best regards,
Pavel
> +++ b/arch/arm64/boot/dts/freescale/fsl-ls208xa.dtsi
> @@ -479,7 +479,6 @@ dspi: spi@2100000 {
> clocks = <&clockgen 4 3>;
> clock-names = "dspi";
> spi-num-chipselects = <5>;
> - bus-num = <0>;
> };
>
> esdhc: esdhc@2140000 {
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