mcp23s08: invalid spi-present-mask in 6.18.39

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Issue 类型
缺陷
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技术栈
c, linux

调研方向

Start by inspecting the linked commit 3fdcca838f971 and the mcp23s08 driver code that reports “invalid spi-present-mask.” Reproduce the behavior with the supplied device-tree values on a Raspberry Pi 4, then verify that the original mask is accepted and both GPIO expanders work without the dmesg error.

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描述

Describe the bug

After upgrading from 6.18.34 to 6.18.39, my 2 mcp23s08 gpio expanders are not working anymore.

In dmesg I get this:

[ 6.025048] mcp23s08 spi0.0: invalid spi-present-mask

/proc/device-tree/soc/spi@7e204000/mcp23s08@0 $ xxd < microchip,spi-present-mask
00000000: 0000 0003

The mcp23s08 part of my dts file, looks like this:

        mcp23s08@0 {
            compatible = "microchip,mcp23s08";
            microchip,spi-present-mask = <3>;
            gpio-controller;
            #gpio-cells = <2>;
            interrupt-parent = <&gpio>;
            interrupts = <23 2>;
            interrupt-controller;
            #interrupt-cells = <2>;
            reg = <0>;
            spi-max-frequency = <10000000>;
        };

If I change spi-present-mask, to this:
microchip,spi-present-mask = <0x03000000>;

/proc/device-tree/soc/spi@7e204000/mcp23s08@0 $ xxd < microchip,spi-present-mask
00000000: 0300 0000

It works again.

The problem seems to be this commit:
https://github.com/raspberrypi/linux/commit/3fdcca838f971

Steps to reproduce the behaviour

Upgrade from 6.18.34 to 6.18.39

Device (s)

Raspberry Pi 4 Mod. B

System

$ cat /etc/rpi-issue
Raspberry Pi reference 2025-12-04
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 4997bf4e4e49bc3305eb182a4a08bd023529da04, stage2

$ vcgencmd version
May 21 2026 11:20:25
Copyright (c) 2012 Broadcom
version 288930ab4712b99596f32732664aaaeb881ef1e0 (clean) (release) (start)

$ uname -a
Linux prod-test 6.18.39+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.18.39-1+rpt1 (2026-07-29) aarch64 GNU/Linux

Logs

[ 6.025048] mcp23s08 spi0.0: invalid spi-present-mask

Additional context

https://lore.kernel.org/all/CAD++jLkmOHF8sPa2OMW9QF3+MHaFWtmpsZje0UU2q0EaN4OExA@mail.gmail.com/

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