ipq40xx: use NVMEM-on-UBI for ASUS devices

[dangowrt]

Some recent ASUS devices started storing their factory data inside a UBI volume. Instead of extracting WiFi EEPROM data and MAC addresses in userspace, use the now available new way to reference the NVMEM bits in device tree.

Lacking the hardware no runtime testing has been done on my end, hence I rely on users to give feedback if this series works as intended.

User tested and confirmed MAC addresses and WiFi EEPROM:

• ASUS RT-AC42U
• ASUS RT-AC58U
• ASUS Lyra MAP-AC2200

Similar changes for mediatek/filogic-based ASUS devices:
#14676

[dangowrt]

@remittor Would be glad if you can take a look

[Leo-PL]

I think I'll try to take my MR33 on a spin for it - it stores caldata on both raw MTD and UBI, the latter being currently preferred by OpenWrt implementation.

[robimarko]

Since I don't have any of these boards, I can just say that the changes look sane to me.

[dangowrt]

@robimarko Thank you for reviewing. The thing is that ASUS bootloaders are full of surprises and may do things like replacing the MTD partitions in DT... So it will need to be tested by someone who got the device.

[robimarko]

Yes, which is why I am refraining from merging this until somebody runtime test this.

[chunkeey]

I've tested this with an ASUS RT-AC58U.

from what I can tell, it works.

[   15.887348] ath10k_ahb a000000.wifi: qca4019 hw1.0 target 0x01000000 chip_id 0x003b00ff sub 0000:0000
[   15.887435] ath10k_ahb a000000.wifi: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 0
[   15.899600] ath10k_ahb a000000.wifi: firmware ver 10.4-3.6-00140 api 5 features no-p2p,mfp,peer-flow-ctrl,btcoex-param,allows-mesh-bcast,no-ps crc32 ba79b746
[   16.050440] ath10k_ahb a000000.wifi: board_file api 2 bmi_id 0:16 crc32 d140cd7d
[   17.397544] ath10k_ahb a000000.wifi: 10.4 wmi init: vdevs: 16  peers: 528  tid: 102
[   17.397674] ath10k_ahb a000000.wifi: msdu-desc: 2500  skid: 32
[   17.458573] ath10k_ahb a000000.wifi: htt-ver 2.2 wmi-op 6 htt-op 4 cal pre-cal-nvmem max-sta 512 raw 0 hwcrypto 1
[   17.466898] ath: EEPROM regdomain: 0x0
[   17.466924] ath: EEPROM indicates default country code should be used
[   17.466932] ath: doing EEPROM country->regdmn map search
[   17.466943] ath: country maps to regdmn code: 0x3a
[   17.466953] ath: Country alpha2 being used: US
[   17.466963] ath: Regpair used: 0x3a
[   18.301316] ath10k_ahb a800000.wifi: qca4019 hw1.0 target 0x01000000 chip_id 0x003b00ff sub 0000:0000
[   18.301439] ath10k_ahb a800000.wifi: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 0
[   18.313579] ath10k_ahb a800000.wifi: firmware ver 10.4-3.6-00140 api 5 features no-p2p,mfp,peer-flow-ctrl,btcoex-param,allows-mesh-bcast,no-ps crc32 ba79b746
[   18.376092] ath10k_ahb a800000.wifi: board_file api 2 bmi_id 0:17 crc32 d140cd7d
[   19.723383] ath10k_ahb a800000.wifi: 10.4 wmi init: vdevs: 16  peers: 528  tid: 102
[   19.723468] ath10k_ahb a800000.wifi: msdu-desc: 2500  skid: 32
[   19.784098] ath10k_ahb a800000.wifi: htt-ver 2.2 wmi-op 6 htt-op 4 cal pre-cal-nvmem max-sta 512 raw 0 hwcrypto 1
[   19.792260] ath: EEPROM regdomain: 0x0
[   19.792286] ath: EEPROM indicates default country code should be used
[   19.792294] ath: doing EEPROM country->regdmn map search
[   19.792304] ath: country maps to regdmn code: 0x3a
[   19.792315] ath: Country alpha2 being used: US
[   19.792324] ath: Regpair used: 0x3a

Content of /dev/ubi0_1 (aka Factory) matches that of /sys/devices/platform/soc/78b5000.spi/spi_master/spi0/spi0.1/mtd/mtd8/ubi0/ubi0_1/ubi0_1/nvmem

EDIT:

Tested-by: Christian Lamparter <chunkeey@gmail.com> (ASUS RT-AC58U)