[PATCH v3] net: mdio: mux-meson-gxl: set reversed bit when using internal phy

[Jakub Kicinski]

On Mon, 28 Apr 2025 20:44:14 -0400 Da Xue wrote:
> > On Fri, Apr 25, 2025 at 03:20:09PM -0400, Da Xue wrote:  
> > > This bit is necessary to receive packets from the internal PHY.
> > > Without this bit set, no activity occurs on the interface.
> > >
> > > Normally u-boot sets this bit, but if u-boot is compiled without
> > > net support, the interface will be up but without any activity.
> > >
> > > The vendor SDK sets this bit along with the PHY_ID bits.  
> >
> > I'd like to clarify that:
> > Without this patch the writel the patch is modifying will clear the PHY_ID bit.
> > But despite that the system works if at some point (uboot) set the PHY_ID bit?  
> 
> Correct. If this is set once, it will work until the IP is powered
> down or reset.
> If u-boot does not set it, Linux will not set it and the IP will not work.
> If u-boot does set it, the IP will not work after suspend-resume since
> the IP is reset.
> Thus, we need to set it on the Linux side when bringing up the interface.

Added to the commit message when applying, thank you both!