[FS#797] Asus RT-N12 rev. D1: Wireless not detected

[LEDE Bugs]

The following task has a new comment added:

FS#797 - Asus RT-N12 rev. D1: Wireless not detected
User who did this - Heinz Repp (h1onlede)

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This severe bug bites me too, same router. Let me add some details:
Lede 17.01.2 , lede-17.01.2-brcm47xx-mips74k-asus-rt-n12-d1-squashfs.trx

After correcting the switch ethernet works as expected, but there is no wifi at all. /etc/config/wireless is missing, and 'wifi config' creates just an empty file there. So clearly the wifi chip is not detected at all ...

root at LEDE:~# cat /proc/cpuinfo 
system type		: Broadcom BCM53572
machine			: Asus RT-N12D1
processor		: 0
cpu model		: MIPS 74Kc V4.9
BogoMIPS		: 149.91
wait instruction	: yes
microsecond timers	: yes
tlb_entries		: 32
extra interrupt vector	: yes
hardware watchpoint	: yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb]
isa			: mips1 mips2 mips32r1 mips32r2
ASEs implemented	: mips16 dsp dsp2
shadow register sets	: 1
kscratch registers	: 0
package			: 0
core			: 0
VCED exceptions		: not available
VCEI exceptions		: not available

root at LEDE:~# dmesg
...
[    0.000000] bcma: bus0: Core 0 found: ChipCommon (manuf 0x4BF, id 0x800, rev 0x27, class 0x0)
[    0.000000] bcma: bus0: Core 1 found: IEEE 802.11 (manuf 0x4BF, id 0x812, rev 0x1C, class 0x0)
[    0.000000] bcma: bus0: Core 2 found: GBit MAC (manuf 0x4BF, id 0x82D, rev 0x03, class 0x0)
[    0.000000] bcma: bus0: Core 3 found: MIPS 74K (manuf 0x4A7, id 0x82C, rev 0x05, class 0x0)
[    0.000000] bcma: bus0: Core 4 found: SDR/DDR1 Memory Controller (manuf 0x4BF, id 0x835, rev 0x02, class 0x0)
[    0.000000] bcma: bus0: Found rev 9 PMU (capabilities 0x28982A09)
[    0.000000] bcma: bus0: Found serial flash
[    0.000000] bcma: bus0: Found M25P64 serial flash (size: 8192KiB, blocksize: 0x10000, blocks: 128)
[    0.000000] bcma: bus0: Early bus registered
[    0.000000] MIPS: machine is Asus RT-N12D1
...
[    0.162552] bcma: bus0: Using SPROM revision 8 provided by platform.
[    0.162604] bcma: bus0: PMU resource config unknown or not needed for device 0xD144
[    0.164633] bcma: bus0: Workarounds unknown or not needed for device 0xD144
[    0.164658] bcma: bus0: Initializing MIPS core...
[    0.164699] bcma: bus0: set_irq: core 0x0812, irq 3 => 3
[    0.164734] bcma: bus0: set_irq: core 0x082d, irq 4 => 4
[    0.164766] bcma: bus0: set_irq: core 0x0800, irq 2 => 2
[    0.164788] bcma: bus0: IRQ reconfiguration done
[    0.164811] bcma: core 0x0800, irq : 2(S)* 3  4  5  6  D  I 
[    0.164881] bcma: core 0x0812, irq : 2(S)  3* 4  5  6  D  I 
[    0.164944] bcma: core 0x082d, irq : 2(S)  3  4* 5  6  D  I 
[    0.165004] bcma: core 0x082c, irq : 2(S)  3  4  5  6  D  I*
[    0.165066] bcma: core 0x0835, irq : 2(S)  3  4  5  6  D* I 
[    0.166841] bcma: bus0: Bus registered
...
and no dmesg line mentioning anything with wifi at all ...

According to https://lede-project.org/toh/hwdata/asus/asus_rt-n12_d1 the wifi chip is:
WLAN Hardware:
    Broadcom BCM5357C0 (integrated)
and dmesg lists it as bus 0 core 1, but it seems the driver is missing?
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=797#comment2956