linux-kernel - 6.8 SPI Chip Select Regression

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Date: Tue, 2 Apr 2024 16:32:50 -0500
From: Colin Foster <colin.foster@...advantage.com>
To: Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>,
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Mark Brown <broonie@...nel.org>
Subject: 6.8 SPI Chip Select Regression

Hi Amit,

I finally got around to testing 6.9-rc2. I must've missed testing
6.8, however, because it seems there are issues - at least in my device
tree - with commit: 4d8ff6b0991d "spi: Add multi-cs memories support in SPI core"

I'm running on a BeagleBone Black, and have a single MFD attached to CS
0. At boot, I see the following:

[    3.459990] omap2_mcspi 48030000.spi: chipselect 0 already in use
[    3.466135] spi_master spi0: spi_device register error /ocp/interconnect@...00000/segment@...arget-module@...00/spi@...oc@0
[    3.477495] spi_master spi0: Failed to create SPI device for /ocp/interconnect@...00000/segment@...arget-module@...00/spi@...oc@0

Is this a known issue? Is there anything I either might need to do to a
device tree, or something you might suggest to help troubleshoot this?

Hardware name: Generic AM33XX (Flattened Device Tree)
Workqueue: events_unbound deferred_probe_work_func
Backtrace:
 dump_backtrace from show_stack+0x20/0x24
 show_stack from dump_stack_lvl+0x60/0x78
 dump_stack_lvl from dump_stack+0x18/0x1c
 dump_stack from __spi_add_device+0x190/0x224
 __spi_add_device from spi_add_device+0x50/0x64
 spi_add_device from of_register_spi_device+0x3d4/0x594
 of_register_spi_device from spi_register_controller+0x3b0/0x6b8
 spi_register_controller from devm_spi_register_controller+0x54/0x94
 devm_spi_register_controller from omap2_mcspi_probe+0x4c4/0x584
 omap2_mcspi_probe from platform_probe+0x6c/0xcc
 platform_probe from really_probe+0xd8/0x2e8


 Thank you.

 Colin Foster