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* [PATCH] arm64: dts: ls208xa: remove bus-num from dspi node
@ 2021-04-28 12:58 Mian Yousaf Kaukab
  2021-05-13  7:59 ` Shawn Guo
  0 siblings, 1 reply; 2+ messages in thread
From: Mian Yousaf Kaukab @ 2021-04-28 12:58 UTC (permalink / raw)
  To: shawnguo, leoyang.li, robh+dt
  Cc: linux-arm-kernel, devicetree, linux-kernel, Mian Yousaf Kaukab

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@suse.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@2100000 {
 					    QORIQ_CLK_PLL_DIV(4)>;
 			clock-names = "dspi";
 			spi-num-chipselects = <5>;
-			bus-num = <0>;
 		};
 
 		esdhc: esdhc@2140000 {
-- 
2.26.2


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^ permalink raw reply related	[flat|nested] 2+ messages in thread

* Re: [PATCH] arm64: dts: ls208xa: remove bus-num from dspi node
  2021-04-28 12:58 [PATCH] arm64: dts: ls208xa: remove bus-num from dspi node Mian Yousaf Kaukab
@ 2021-05-13  7:59 ` Shawn Guo
  0 siblings, 0 replies; 2+ messages in thread
From: Shawn Guo @ 2021-05-13  7:59 UTC (permalink / raw)
  To: Mian Yousaf Kaukab
  Cc: leoyang.li, robh+dt, linux-arm-kernel, devicetree, linux-kernel

On Wed, Apr 28, 2021 at 02:58:07PM +0200, Mian Yousaf Kaukab wrote:
> 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@suse.de>

Applied, thanks.

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^ permalink raw reply	[flat|nested] 2+ messages in thread

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