Kernel Warning on spidev

[ski7777]

[    2.237102] ------------[ cut here ]------------
[    2.237152] WARNING: CPU: 0 PID: 1 at drivers/spi/spidev.c:729 spidev_probe+0x190/0x1f0
[    2.237170] Modules linked in:
[    2.237210] CPU: 0 PID: 1 Comm: swapper Not tainted 4.14.97 #5
[    2.237226] Hardware name: Generic AM33XX (Flattened Device Tree)
[    2.237269] [<c010e4ec>] (unwind_backtrace) from [<c010be2c>] (show_stack+0x10/0x14)
[    2.237300] [<c010be2c>] (show_stack) from [<c013287c>] (__warn+0xc8/0x100)
[    2.237325] [<c013287c>] (__warn) from [<c0132964>] (warn_slowpath_null+0x20/0x28)
[    2.237349] [<c0132964>] (warn_slowpath_null) from [<c06138d0>] (spidev_probe+0x190/0x1f0)
[    2.237374] [<c06138d0>] (spidev_probe) from [<c060f00c>] (spi_drv_probe+0x78/0xa8)
[    2.237400] [<c060f00c>] (spi_drv_probe) from [<c0584a14>] (driver_probe_device+0x274/0x390)
[    2.237437] [<c0584a14>] (driver_probe_device) from [<c0582aa8>] (bus_for_each_drv+0x74/0x98)
[    2.237462] [<c0582aa8>] (bus_for_each_drv) from [<c0584448>] (__device_attach+0xd4/0x14c)
[    2.237484] [<c0584448>] (__device_attach) from [<c0583ae0>] (bus_probe_device+0x88/0x90)
[    2.237508] [<c0583ae0>] (bus_probe_device) from [<c058120c>] (device_add+0x3e4/0x604)
[    2.237533] [<c058120c>] (device_add) from [<c060fc5c>] (spi_add_device+0x94/0x134)
[    2.237557] [<c060fc5c>] (spi_add_device) from [<c0610360>] (spi_register_controller+0x4f0/0xac4)
[    2.237581] [<c0610360>] (spi_register_controller) from [<c0610964>] (devm_spi_register_controller+0x30/0x70)
[    2.237606] [<c0610964>] (devm_spi_register_controller) from [<c0615010>] (omap2_mcspi_probe+0x268/0x32c)
[    2.237634] [<c0615010>] (omap2_mcspi_probe) from [<c05867e0>] (platform_drv_probe+0x50/0xac)
[    2.237657] [<c05867e0>] (platform_drv_probe) from [<c0584a14>] (driver_probe_device+0x274/0x390)
[    2.237680] [<c0584a14>] (driver_probe_device) from [<c0584c0c>] (__driver_attach+0xdc/0x100)
[    2.237704] [<c0584c0c>] (__driver_attach) from [<c0582a10>] (bus_for_each_dev+0x7c/0xa0)
[    2.237728] [<c0582a10>] (bus_for_each_dev) from [<c0583d50>] (bus_add_driver+0x16c/0x200)
[    2.237750] [<c0583d50>] (bus_add_driver) from [<c05859f4>] (driver_register+0x8c/0x10c)
[    2.237775] [<c05859f4>] (driver_register) from [<c0101d10>] (do_one_initcall+0x3c/0x178)
[    2.237811] [<c0101d10>] (do_one_initcall) from [<c0d00d54>] (kernel_init_freeable+0x100/0x1b4)
[    2.237842] [<c0d00d54>] (kernel_init_freeable) from [<c09151d8>] (kernel_init+0x8/0x10c)
[    2.237873] [<c09151d8>] (kernel_init) from [<c0107bd4>] (ret_from_fork+0x14/0x20)
[    2.237962] ---[ end trace 19676f3620d5f7dc ]---

This might be the fix: https://github.com/fischertechnik/FT-TXT/blob/master/board/FT/TXT/DTS_4.1/am335x-kno_txt.dts#L131