linux-kernel - [PATCH 4.19 026/120] arm64: dts: ls208xa: remove bus-num from dspi node

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Message-Id: <20210726153833.226163477@linuxfoundation.org>
Date:   Mon, 26 Jul 2021 17:37:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mian Yousaf Kaukab <ykaukab@...e.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 026/120] arm64: dts: ls208xa: remove bus-num from dspi node

From: Mian Yousaf Kaukab <ykaukab@...e.de>

[ 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.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@...e.de>
Signed-off-by: Shawn Guo <shawnguo@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 ebe0cd4bf2b7..8c22ce904e65 100644
--- a/arch/arm64/boot/dts/freescale/fsl-ls208xa.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-ls208xa.dtsi
@@ -479,7 +479,6 @@
 			clocks = <&clockgen 4 3>;
 			clock-names = "dspi";
 			spi-num-chipselects = <5>;
-			bus-num = <0>;
 		};
 
 		esdhc: esdhc@...0000 {
-- 
2.30.2