Create radio1 for wifi 7 pcie phy (wcn7850) to enable dual band

Installing and Using OpenWrt
1

i am trying to create dual band ssid through wcn7850, but fail to create one.

 cat /etc/config/wireless

config wifi-device 'radio0'
        option type 'mac80211'
        option path 'fe180000.pcie/pci0003:30/0003:30:00.0/0003:31:00.0'
...

config wifi-device 'radio1'
        option type 'mac80211'
        option path 'fe180000.pcie/pci0003:30/0003:30:00.0/0003:31:00.0+1'
...


logread|grep radio
Fri Nov 22 20:36:29 2024 daemon.notice netifd: radio0 (16829): sh: acs_survey: out of range
Fri Nov 22 20:36:29 2024 daemon.notice netifd: Wireless device 'radio0' is now up
Fri Nov 22 20:49:41 2024 daemon.notice netifd: Wireless device 'radio0' is now down
Fri Nov 22 20:49:42 2024 daemon.notice netifd: radio0 (18582): WARNING: Variable 'data' does not exist or is not an array/object
Fri Nov 22 20:49:42 2024 daemon.notice netifd: radio1 (18583): WARNING: Variable 'data' does not exist or is not an array/object
Fri Nov 22 20:49:42 2024 daemon.notice netifd: radio1 (18583): Phy not found
Fri Nov 22 20:49:42 2024 daemon.notice netifd: radio1 (18583): Could not find PHY for device 'radio1'
Fri Nov 22 20:49:42 2024 daemon.notice netifd: Wireless device 'radio1' set retry=0
Fri Nov 22 20:49:42 2024 daemon.crit netifd: Wireless device 'radio1' setup failed, retry=0
Fri Nov 22 20:49:42 2024 daemon.notice netifd: radio1 (18642): WARNING: Variable 'data' does not exist or is not an array/object
Fri Nov 22 20:49:42 2024 daemon.notice netifd: radio1 (18642): Bug: PHY is undefined for device 'radio1'
Fri Nov 22 20:49:42 2024 daemon.notice netifd: Wireless device 'radio1' is now down
Fri Nov 22 20:49:43 2024 daemon.notice netifd: radio0 (18582): sh: acs_survey: out of range
Fri Nov 22 20:49:43 2024 daemon.notice netifd: Wireless device 'radio0' is now up


Wiphy phy0
        wiphy index: 0
        max # scan SSIDs: 16
        max scan IEs length: 339 bytes
        max # sched scan SSIDs: 16
        max # match sets: 16
        Retry short limit: 7
        Retry long limit: 4
        Coverage class: 0 (up to 0m)
        Device supports AP-side u-APSD.
        Available Antennas: TX 0x3 RX 0x3
        Configured Antennas: TX 0x3 RX 0x3
        Supported interface modes:
                 * managed
                 * AP
                 * P2P-client
                 * P2P-GO
                 * P2P-device
        Band 1:
                Capabilities: 0x19ef
                        RX LDPC
                        HT20/HT40
                        SM Power Save disabled
                        RX HT20 SGI
                        RX HT40 SGI
                        TX STBC
                        RX STBC 1-stream
                        Max AMSDU length: 7935 bytes
                        DSSS/CCK HT40

...


        valid interface combinations:
                 * #{ managed } <= 1, #{ AP, P2P-client, P2P-GO } <= 16, #{ P2P-device } <= 1,
                   total <= 16, #channels <= 1, STA/AP BI must match, radar detect widths: { 20 MHz (no HT), 20 MHz, 40 MHz, 80 MHz }

        HT Capability overrides:
                 * MCS: ff ff ff ff ff ff ff ff ff ff
                 * maximum A-MSDU length
                 * supported channel width
                 * short GI for 40 MHz
                 * max A-MPDU length exponent
                 * min MPDU start spacing
        max # scan plans: 2
        max scan plan interval: 7200
        max scan plan iterations: 100
        Maximum associated stations in AP mode: 512
        Supported extended features:
                * [ RRM ]: RRM
                * [ FILS_STA ]: STA FILS (Fast Initial Link Setup)
                * [ CQM_RSSI_LIST ]: multiple CQM_RSSI_THOLD records
                * [ CONTROL_PORT_OVER_NL80211 ]: control port over nl80211
                * [ TXQS ]: FQ-CoDel-enabled intermediate TXQs
                * [ STA_TX_PWR ]: TX power control per station
                * [ CONTROL_PORT_NO_PREAUTH ]: disable pre-auth over nl80211 control port support
                * [ SCAN_FREQ_KHZ ]: scan on kHz frequency support
                * [ CONTROL_PORT_OVER_NL80211_TX_STATUS ]: tx status for nl80211 control port support
                * [ FILS_DISCOVERY ]: FILS discovery frame transmission support
                * [ UNSOL_BCAST_PROBE_RESP ]: unsolicated broadcast probe response transmission support
                * [ POWERED_ADDR_CHANGE ]: can change MAC address while up
                * [ PUNCT ]: preamble puncturing in AP mode
2 
wifi status
{
        "radio0": {
                "up": true,
                "pending": false,
                "autostart": true,
                "disabled": false,
                "retry_setup_failed": false,
                "config": {
                        "path": "fe180000.pcie/pci0003:30/0003:30:00.0/0003:31:00.0",
                        ...
                },
                "interfaces": [

                ]
        },
        "radio1": {
                "up": false,
                "pending": false,
                "autostart": true,
                "disabled": false,
                "retry_setup_failed": true,
                "config": {
                        "path": "fe180000.pcie/pci0003:30/0003:30:00.0/0003:31:00.0+1",
                        ...
                },
                "interfaces": [

                ]
        }
}
3

radio1 is always up: false

4

i also tried mt7921, but as clarified by @slh, this chip is not capable to support cocurrent dual band.