linux-kernel - [PATCH] arm64: dts: ls208xa: remove bus-num from dspi node

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Date:   Wed, 28 Apr 2021 14:58:07 +0200
From:   Mian Yousaf Kaukab <ykaukab@...e.de>
To:     shawnguo@...nel.org, leoyang.li@....com, robh+dt@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mian Yousaf Kaukab <ykaukab@...e.de>
Subject: [PATCH] arm64: dts: ls208xa: remove bus-num from dspi node

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.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@...e.de>
---
 arch/arm64/boot/dts/freescale/fsl-ls208xa.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/fsl-ls208xa.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls208xa.dtsi
index 135ac8210871..801ba9612d36 100644
--- a/arch/arm64/boot/dts/freescale/fsl-ls208xa.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-ls208xa.dtsi
@@ -929,7 +929,6 @@ dspi: spi@...0000 {
 					    QORIQ_CLK_PLL_DIV(4)>;
 			clock-names = "dspi";
 			spi-num-chipselects = <5>;
-			bus-num = <0>;
 		};

 		esdhc: esdhc@...0000 {
-- 
2.26.2