WL1837-st on imx6 request_firmware failed with 4.16-RC6

[Adam Ford]

I have an i.MX6 board and I am trying to get Bluetooth operational on
4.16-RC6 using the default imx_v6_v7_defconfig

I have my device tree configured as follows:

&uart2 {
  pinctrl-names = "default";
  pinctrl-0 = <&pinctrl_uart2>;
  uart-has-rtscts;
  status = "okay";

  bluetooth {
    compatible = "ti,wl1837-st";
    enable-gpios = <&gpio7 8 GPIO_ACTIVE_HIGH>;
  };
};

I have the firmware TIInit_11.8.32  available in /lib/firmware/ti-connectivity

# ls -l /lib/firmware/ti-connectivity/
total 2748
-rwxrwxrwx    1 root     root         53488 Mar 21  2018 TIInit_10.6.15.bts
-rwxrwxrwx    1 root     root         70313 Mar 21  2018 TIInit_11.8.32.bts
-rwxrwxrwx    1 root     root         14610 Mar 21  2018 TIInit_12.10.28.bts
-rwxrwxrwx    1 root     root         70313 Mar 21  2018 TIInit_12.8.32.bts
-rwxrwxrwx    1 root     root         48909 Jan  4  2018 TIInit_7.2.31.bts
-rwxrwxrwx    1 root     root         50695 Mar 21  2018 TIInit_7.6.15.bts

However, when the Bluetooth driver loads, it appears it cannot locate
the proper firmware image.

[    0.176338] Bluetooth: Core ver 2.22
[    0.176453] Bluetooth: HCI device and connection manager initialized
[    0.176529] Bluetooth: HCI socket layer initialized
[    0.176563] Bluetooth: L2CAP socket layer initialized
[    0.176705] Bluetooth: SCO socket layer initialized
[    2.043237] Bluetooth: HCI UART driver ver 2.3
[    2.047710] Bluetooth: HCI UART protocol H4 registered
[    2.055090] Bluetooth: HCI UART protocol LL registered
[    2.130658] Bluetooth: hci0: request_firmware failed(errno -2) for
ti-connectivity/TIInit_11.8.32.bts
[    2.147064] Bluetooth: hci0: download firmware failed, retrying...
[    2.218509] Bluetooth: hci0: request_firmware failed(errno -2) for
ti-connectivity/TIInit_11.8.32.bts
[    2.227752] Bluetooth: hci0: download firmware failed, retrying...
[    2.288584] Bluetooth: hci0: request_firmware failed(errno -2) for
ti-connectivity/TIInit_11.8.32.bts
[    2.306472] Bluetooth: hci0: download firmware failed, retrying...
[    2.380161] Bluetooth: hci0: request_firmware failed(errno -2) for
ti-connectivity/TIInit_11.8.32.bts
[    2.389459] Bluetooth: hci0: download firmware failed, retrying...

I was hoping someone might have some insight on what might be the issue.

Thanks

adam

pinctrl_uart2: uart2grp {
fsl,pins = <
MX6QDL_PAD_SD4_DAT4__UART2_RX_DATA 0x1b0b1
MX6QDL_PAD_SD4_DAT5__UART2_RTS_B 0x1b0b1
MX6QDL_PAD_SD4_DAT6__UART2_CTS_B 0x1b0b1
MX6QDL_PAD_SD4_DAT7__UART2_TX_DATA 0x1b0b1
MX6QDL_PAD_SD3_RST__GPIO7_IO08 0x13059 /* BT_EN */
>;
};