Re: [PATCH AUTOSEL 4.19 31/39] arm64: dts: ls208xa: remove bus-num from dspi node
From: Pavel Machek <hidden>
Date: 2021-07-23 20:11:09
Also in:
linux-arm-kernel, linux-devicetree, lkml
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
quoted hunk ↗ jump to hunk
+++ 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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