+ Rafal, Anil, Sanket, Jayshri, Rahul > >We are discussing if Cadence/TI/NXP could use the same USB PHY driver > >(drivers/phy/cadence/phy-cadence-sierra.c), I find I can't get > >Alan Douglas <adoug...@cadence.com>, would you please forward related > >people? The question is like below, thanks. > > > >Alan, we find the suggested value at this driver >(drivers/phy/cadence/phy-cadence-sierra.c) > >is so different with "USB 3.0 PHY User Guide for 28FDSOI" CH 3.1.1 Bring-up >Sequence. > >Does this driver support this 28nm PHY? If it supports, why the initialized >value is so different? > >The UG suggested value can be used at NXP platform. > > > >Peter > > > >> > > > >> > > This is indeed a different driver. IMO it would be better to keep > >> > > the driver closer to its linux version. The reason for that is that > >> > > it is quite new and will be adapted when platforms starts supporting > >> > > it. If we start with something too far from the original, it will hard >> > > to update. > >> > > Already I see that the registers initialized are not all the same as > >> > > in the linux driver and not all the values are the same either, nor > >> > > are the register names > >> > > > >> > > TI's J7 platforms is using this PHY driver for USB3/PCIe support, > >> > > and the linux driver has already seen quite a few modifications to > >> > > get it to work > >> > (https://urldefense.proofpoint.com/v2/url?u=https-3A__eur01.safelinks.protection.outlook.com_-3Furl-3Dhttps-253A-252F- >252Fgit.ti&d=DwIGaQ&c=aUq983L2pue2FqKFoP6PGHMJQyoJ7kl3s3GZ-_haXqY&r=e1OgxfvkL0qo9XO6fX1gscva-w03uSYC1nIyxl89- >rI&m=Ip2RbyxoGLS3zuYNjazxkPFURIUZllrs6iSfUmllZGM&s=MG2JpCkGii7tKv3Sb4ekJ08smJd54TTIC6jmZpOdzY0&e= > . > >> > > com%2Fti-linux-kernel%2Fti-linux-kernel%2Fblobs%2Fhistory%2Fti-linux > >> > > - > >> > > 4.19.y%2Fdrivers%2Fphy%2Fcadence%2Fphy-cadence- > >> > > sierra.c&data=02%7C01%7Csherry.sun%40nxp.com%7C84f9122d7eb64 > >> > > 9820bae08d72b997681%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0 > >> > > %7C637025810458595586&sdata=6JpD7VcFudhzXSVP0WaGVEp7Fwrue > >> > > A%2B4V6eeOfif19w%3D&reserved=0) > >> > > Adding support for it on top of this current version will be rather >> > > difficult. > >> > > > >> > > >> > Thanks for your advice. > >> > Actually I am not familiar with this phy driver in linux, so also > >> > +peter, who worked on this USB driver under linux, maybe he can give some > >> suggestions. > >> > > >> > >> Add Alan from Cadence > >> > >> Alan, we find the suggested value at this driver >> (drivers/phy/cadence/phy-cadence- > >> sierra.c) > >> is so different with "USB 3.0 PHY User Guide for 28FDSOI" CH 3.1.1 Bring-up > >> Sequence. > >> Does this driver support this 28nm PHY? If it supports, why the initialized >> value is so > >> different? > >> The UG suggested value can be used at NXP platform. > >> > >> Peter
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