Re: [PATCH v2 0/3] MIPS: BCM47XX: convert buttons to software nodes

[Waldemar Brodkorb <wbx@openadk.org>]

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Hi,
Arnd Bergmann wrote,

> On Mon, Jul 13, 2026, at 23:58, Dmitry Torokhov wrote:
> > This series converts the legacy gpio-keys platform device on BCM47XX
> > boards to use software nodes and static properties.
> >
> > To do this properly without relying on legacy name-based matching
> > (which is being removed from gpiolib), we introduce and register
> > software nodes for the underlying GPIO controllers (BCMA and SSB)
> > and reference them in the button properties.
> >
> > The first two patches add the software nodes to bcma-gpio and
> > ssb-gpio respectively. The third patch performs the conversion
> > for the BCM47XX buttons.
> >
> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> > ---
> > As Johannes mentioned on v1 this best should go through MIPS tree.
> 
> Adding Waldemar to Cc. He has recently done some work to
> get this platform working again in FreeWRT and should
> be able to test your patches on hardware.

I normally use LTS kernel on the hardware (Linksys WRT54GS v1.0).
But for testing I updated to 7.1.3. Attached is the dmesg without
Dmitry's patches.  Button works, I can go into failsafe mode after
pressing the reset button on bootup.

With Dmitry's three patches applied I directly getting into failsafe
mode without pressing any button. Dmesg looks similar, but I get
following kernel message:
platform gpio-keys.0: deferred probe pending: gpio-keys: failed to get gpio

Looking at /dev I see no /dev/input/event0 device node anymore.

Attached is the small failsafe script I use on bootup.
Hope this helps.

Do I need to change my failsafe script for the new stuff or is
something else broken now? Do I miss some new kernel config option?
Or is the patch only for latest Linus git repo.

best regards
 Waldemar


[-- Attachment #2: dmesg.txt --]
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Linux version 7.1.3 (wbx@macbook) (mipsel-freewrt-linux-uclibc-gcc (GCC) 16.1.0, GNU ld (GNU Binutils) 2.46.1) #1 Tue Jul 14 22:54:31 CEST 2026
printk: legacy bootconsole [early0] enabled
CPU0 revision is: 00029007 (Broadcom BMIPS3300)
bcm47xx: Using ssb bus
ssb: Found chip with id 0x4712, rev 0x01 and package 0x00
can not parse nvram name (null)ag0(null) with value 255 got -34
ssb: Sonics Silicon Backplane found at address 0x18000000
Primary instruction cache 8kB, VIPT, 2-way, linesize 16 bytes.
Primary data cache 4kB, 2-way, VIPT, no aliases, linesize 16 bytes
Zone ranges:
  Normal   [mem 0x0000000000000000-0x0000000001ffffff]
Movable zone start for each node
Early memory node ranges
  node   0: [mem 0x0000000000000000-0x0000000001ffffff]
Initmem setup node 0 [mem 0x0000000000000000-0x0000000001ffffff]
pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
pcpu-alloc: [0] 0 
Kernel command line: root=/dev/mtdblock4 rootfstype=squashfs init=/etc/preinit noinitrd console=ttyS0,115200
Unknown kernel command line parameters "noinitrd", will be passed to user space.
printk: log buffer data + meta data: 131072 + 409600 = 540672 bytes
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes, linear)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
Built 1 zonelists, mobility grouping on.  Total pages: 8192
mem auto-init: stack:all(zero), heap alloc:off, heap free:off
SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
NR_IRQS: 256
MIPS: machine is Linksys WRT54G/GS/GL
clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns
sched_clock: 32 bits at 100MHz, resolution 10ns, wraps every 21474836475ns
Console: colour dummy device 80x25
Calibrating delay loop... 198.65 BogoMIPS (lpj=397312)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
VFS: Finished mounting rootfs on nullfs
Memory: 25676K/32768K available (4010K kernel code, 555K rwdata, 956K rodata, 228K init, 268K bss, 6348K reserved, 0K cma-reserved)
devtmpfs: initialized
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
posixtimers hash table entries: 512 (order: 0, 2048 bytes, linear)
futex hash table entries: 256 (4096 bytes on 1 NUMA nodes, total 4 KiB, linear).
NET: Registered PF_NETLINK/PF_ROUTE protocol family
clocksource: Switched to clocksource MIPS
PCI host bridge to bus 0000:00
pci_bus 0000:00: root bus resource [mem 0x40000000-0x7fffffff]
pci_bus 0000:00: root bus resource [io  0x0100-0x07ff]
pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
pci 0000:00:00.0: PCI: Fixing up bridge 0000:00:00.0
pci 0000:00:00.0: PCI: Fixing up device 0000:00:00.0
pci 0000:00:00.0: PCI: Fixing latency timer of device 0000:00:00.0 to 168
pci 0000:00:00.0: ssb_pcicore_fixup_pcibridge+0x0/0xf8 took 17926 usecs
pci 0000:00:00.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:00.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:00.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:01.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:01.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:01.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:02.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:02.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:02.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:03.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:03.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:03.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:04.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:04.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:04.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:05.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:05.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:05.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:06.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:06.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:06.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:07.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:07.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:07.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:08.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:08.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:08.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:09.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:09.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:09.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:0a.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:0a.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:0a.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:0b.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:0b.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:0b.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:0c.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:0c.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:0c.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:0d.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:0d.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:0d.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:0e.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:0e.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:0e.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci 0000:00:0f.0: [14e4:4712] type 00 class 0x060000 conventional PCI endpoint
pci 0000:00:0f.0: BAR 0 [mem 0x00000000-0x00001fff]
pci 0000:00:0f.0: BAR 1 [mem 0x00000000-0x07ffffff pref]
pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 00
gpio gpiochip0: Static allocation of GPIO base is deprecated, use dynamic allocation.
NET: Registered PF_INET protocol family
IP idents hash table entries: 2048 (order: 2, 16384 bytes, linear)
tcp_listen_portaddr_hash hash table entries: 1024 (order: 0, 4096 bytes, linear)
Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear)
TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear)
TCP bind hash table entries: 1024 (order: 1, 8192 bytes, linear)
TCP: Hash tables configured (established 1024 bind 1024)
UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
NET: Registered PF_UNIX/PF_LOCAL protocol family
PCI: CLS 0 bytes, default 16
Initialise system trusted keyrings
workingset: timestamp_bits=30 (anon: 26) max_order=13 bucket_order=0 (anon: 0)
squashfs: version 4.0 (2009/01/31) Phillip Lougher
Key type asymmetric registered
Asymmetric key parser 'x509' registered
io scheduler mq-deadline registered
Serial: 8250/16550 driver, 2 ports, IRQ sharing disabled
printk: legacy console [ttyS0] disabled
serial8250.0: ttyS0 at MMIO 0xb8000300 (irq = 3, base_baud = 3125000) is a 16550A
printk: legacy console [ttyS0] enabled
printk: legacy bootconsole [early0] disabled
serial8250.0: ttyS1 at MMIO 0xb8000400 (irq = 3, base_baud = 3125000) is a 16550A
physmap-flash physmap-flash.0: physmap platform flash device: [mem 0x1c000000-0x1e000000]
physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank. Manufacturer ID 0x000089 Chip ID 0x000017
physmap-flash.0: Found an alias at 0x800000 for the chip at 0x0
physmap-flash.0: Found an alias at 0x1000000 for the chip at 0x0
physmap-flash.0: Found an alias at 0x1800000 for the chip at 0x0
Intel/Sharp Extended Query Table at 0x0031
Intel/Sharp Extended Query Table at 0x0031
Using buffer write method
cfi_cmdset_0001: Erase suspend on write enabled
erase region 0: offset=0x0,size=0x20000,blocks=64
4 bcm47xxpart partitions found on MTD device physmap-flash.0
Creating 4 MTD partitions on "physmap-flash.0":
0x000000000000-0x000000040000 : "boot"
0x000000040000-0x0000007c0000 : "firmware"
failed to parse "brcm,trx-magic" DT attribute, using default: -89
3 trx partitions found on MTD device firmware
Creating 3 MTD partitions on "firmware":
0x00000000001c-0x000000000938 : "loader"
mtd: partition "loader" doesn't start on an erase/write block boundary -- force read-only
0x000000000938-0x0000001c0800 : "linux"
mtd: partition "linux" doesn't start on an erase/write block boundary -- force read-only
0x0000001c0800-0x000000780000 : "rootfs"
mtd: partition "rootfs" doesn't start on an erase/write block boundary -- force read-only
0x0000007c0000-0x0000007e0000 : "fwcf"
0x0000007e0000-0x000000800000 : "nvram"
b44 ssb0:1: could not find PHY at 30, use fixed one
Generic PHY fixed-0:00: attached PHY driver (mii_bus:phy_addr=fixed-0:00, irq=POLL)
b44 ssb0:1 eth0: Broadcom 44xx/47xx 10/100 PCI ethernet driver 00:0f:66:c8:74:47
NET: Registered PF_PACKET protocol family
8021q: 802.1Q VLAN Support v1.8
Loading compiled-in X.509 certificates
input: gpio-keys as /devices/platform/gpio-keys.0/input/input0
VFS: Mounted root (squashfs filesystem) readonly on device 31:4.
devtmpfs: mounted
VFS: Pivoted into new rootfs
Freeing unused kernel image (initmem) memory: 228K
This architecture does not have kernel memory protection.
Run /etc/preinit as init process
  with arguments:
    /etc/preinit
    noinitrd
  with environment:
    HOME=/
    TERM=linux
random: crng init done
b44 ssb0:1 eth0: Link is up at 100 Mbps, half duplex
b44 ssb0:1 eth0: Flow control is off for TX and off for RX
b44 ssb0:1 eth0: Link is Up - 100Mbps/Full - flow control off
cfg80211: Loading compiled-in X.509 certificates for regulatory database
Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
Loaded X.509 cert 'wens: 61c038651aabdcf94bd0ac7ff06c7248db18c600'
faux_driver regulatory: Direct firmware load for regulatory.db failed with error -2
cfg80211: failed to load regulatory.db
adm6996: adm6996_gpio: ADM6996L model PHY found.
b43-phy0: Broadcom 4712 WLAN found (core revision 7)
b43-phy0: Found PHY: Analog 2, Type 2 (G), Revision 2
b43-phy0: Found Radio: Manuf 0x17F, ID 0x2050, Revision 2, Version 0
Broadcom 43xx driver loaded [ Features: PL ]
ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'

[-- Attachment #3: failsafe --]
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#!/bin/sh

# detect router
id=$(nvram get productid)

case "$id" in
  WL500*)
    LED_PATH="/sys/class/leds/bcm47xx:unk:power"
    ;;
  *)
    LED_PATH="/sys/class/leds/bcm47xx:green:dmz"
    ;;
esac

# CONFIGURE
EVENT_DEV="/dev/input/event0"    # change if your reset button is on a different event device
KEY_CODE="KEY_RESTART"           # as reported by evtest
FAILSAFE_IP="192.168.1.1"
FAILSAFE_BCAST="192.168.1.255"

# Bring up LAN
ip link set up dev eth0
ip addr add ${FAILSAFE_IP}/24 broadcast ${FAILSAFE_BCAST} dev eth0

# Warn the user
netmsg ${FAILSAFE_BCAST} "Press reset now, to enter Failsafe!"
echo "Press reset now to enter Failsafe!"
sleep 2 &

# Check for reset press during the 2s window
# We'll read the event stream for KEY_RESTART with value 1 (press)
pressed=0
timeout 2 sh -c "
    evtest ${EVENT_DEV} 2>/dev/null | \
    grep -m1 '${KEY_CODE}.*value 1' && exit 0 || exit 1
"
if [ $? -eq 0 ]; then
    pressed=1
fi

if [ "$pressed" -eq 1 ]; then
    # Blink LED in background
    (
        while :; do
            echo 1 > ${LED_PATH}/brightness
            sleep 0.5
            echo 0 > ${LED_PATH}/brightness
            sleep 0.5
        done
    ) &

    netmsg ${FAILSAFE_BCAST} "Entering Failsafe!"
    telnetd -l /bin/sh
    exit 1
else
    ip addr flush dev eth0
    killall evtest
fi