ath79: use gpios for switch management in WZR-HP-G300NH variants

The RTL8366S/RB switch node in DTS defines "mii-bus = <&mdio0>" to permit
management via SMI but this has likely never worked, instead falling back
to using GPIOs in the past:

     rtl8366s switch: cannot find mdio bus from bus handle (yet)
     rtl8366s switch: using GPIO pins 19 (SDA) and 20 (SCK)
     rtl8366s switch: RTL8366 ver. 1 chip found

Recently, the rtl8366s and rtl8366_smi drivers were changed from built-in
to loadable modules. This affected driver probing order and caused switch
initialization (and network access) to fail:

     rtl8366s switch: using MDIO bus 'ag71xx_mdio'
     rtl8366s switch: unknown chip id (ffff)
     rtl8366s switch: chip detection failed, err=-19

Force using GPIOs to manage the switch by dropping the "mii-bus" DTS
definition, which works for both built-in and loadable switch drivers.

Fixes: 6e0f0eae5b ("ath79: use rtl8366s and rtl8366_smi as a module")
Fixes: 575ec7a4b1 ("ath79: use rtl8366rb as a module")
Tested-by: Tony Ambardar <itugrok@yahoo.com> # WZR-HP-G300NH (RTL8366S)
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>

diff --git a/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh.dtsi b/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh.dtsi
index 4443ba583e0cbeb4157be0a25f7fe2e8d52d37b7..ac3af134577fa270b8912ee4abca43b1d053bf28 100644 (file)
--- a/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh.dtsi
+++ b/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh.dtsi
@@ -178,7 +178,6 @@
 
                gpio-sda = <&gpio 19 GPIO_ACTIVE_HIGH>;
                gpio-sck = <&gpio 20 GPIO_ACTIVE_HIGH>;
-               mii-bus = <&mdio0>;
 
                mdio-bus {
                        status = "okay";