[PATCH 4/5] arm: dts: k3-j721e-beagleboneai64: Fix USB operation

[Nishanth Menon]

On 15:06-20240112, Roger Quadros wrote:
> 
> 
> On 12/01/2024 15:02, Nishanth Menon wrote:
> > On 14:49-20240112, Roger Quadros wrote:
> >> Without correct SERDES MUX and Lane control settings
> >> USB0 will be broken. Set the MUX and Lane control devices
> >> to be auto probed so they are configured correctly.
> >>
> >> Signed-off-by: Roger Quadros <rogerq at kernel.org>
> >> ---
> >>  arch/arm/dts/k3-j721e-beagleboneai64-u-boot.dtsi | 2 ++
> >>  1 file changed, 2 insertions(+)
> >>
> >> diff --git a/arch/arm/dts/k3-j721e-beagleboneai64-u-boot.dtsi b/arch/arm/dts/k3-j721e-beagleboneai64-u-boot.dtsi
> >> index f83caf7998..017a5a722e 100644
> >> --- a/arch/arm/dts/k3-j721e-beagleboneai64-u-boot.dtsi
> >> +++ b/arch/arm/dts/k3-j721e-beagleboneai64-u-boot.dtsi
> >> @@ -165,6 +165,7 @@
> >>  
> >>  &serdes_ln_ctrl {
> >>  	bootph-all;
> >> +	u-boot,mux-autoprobe;
> >>  };
> >>  
> >>  &serdes2_usb_link {
> >> @@ -173,6 +174,7 @@
> >>  
> >>  &usb_serdes_mux {
> >>  	bootph-all;
> >> +	u-boot,mux-autoprobe;
> >>  };
> >>  
> >>  &serdes_wiz2 {
> >> -- 
> >> 2.34.1
> >>
> > 
> > Is this a u-boot thing? or a driver limitation?
> > 
> 
> u-boot specific. We just want the mux driver to probe
> and apply the settings.
> 
> from drivers/mux/mux-uclass.c
> 
> int dm_mux_init(void)
> {
>         struct uclass *uc;
>         struct udevice *dev;
>         int ret;
> 
>         ret = uclass_get(UCLASS_MUX, &uc);
>         if (ret < 0) {
>                 log_debug("unable to get MUX uclass\n");
>                 return ret;
>         }
>         uclass_foreach_dev(dev, uc) {
>                 if (dev_read_bool(dev, "u-boot,mux-autoprobe")) {
>                         ret = device_probe(dev);
>                         if (ret)
>                                 log_debug("unable to probe device %s\n",
>                                           dev->name);
>                 }
>         }
> 
>         return 0;
> }
> 
> 

Uggh.. We need to see eventually how to get rid of this.
This makes
https://lore.kernel.org/u-boot/20240110103547.719757-1-sumit.garg@linaro.org/#t
harder now?

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D