RE: [PATCH 00/16] Add initial USB support for the Renesas RZ/G3S SoC

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> -----Original Message-----
> From: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> Sent: Tuesday, September 3, 2024 12:07 PM
> To: Claudiu.Beznea <claudiu.beznea@xxxxxxxxx>; Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> Cc: vkoul@xxxxxxxxxx; kishon@xxxxxxxxxx; robh@xxxxxxxxxx; krzk+dt@xxxxxxxxxx; conor+dt@xxxxxxxxxx;
> p.zabel@xxxxxxxxxxxxxx; geert+renesas@xxxxxxxxx; magnus.damm@xxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx;
> mturquette@xxxxxxxxxxxx; sboyd@xxxxxxxxxx; Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>;
> linux-phy@xxxxxxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-
> renesas-soc@xxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-
> clk@xxxxxxxxxxxxxxx; linux-pm@xxxxxxxxxxxxxxx; Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
> Subject: RE: [PATCH 00/16] Add initial USB support for the Renesas RZ/G3S SoC
> 
> Hi Claudiu,
> 
> > -----Original Message-----
> > From: claudiu beznea <claudiu.beznea@xxxxxxxxx>
> > Sent: Tuesday, September 3, 2024 12:00 PM
> > Subject: Re: [PATCH 00/16] Add initial USB support for the Renesas
> > RZ/G3S SoC
> >
> >
> >
> > On 03.09.2024 13:31, Biju Das wrote:
> > >>> During boot clr USB PWR READY signal in TF-A.
> > >>> STR case, suspend set USB PWR READY signal in TF-A.
> > >>> STR case, resume clr USB PWR READY signal in TF-A.
> > >> As I said previously, it can be done in different ways. My point
> > >> was to let Linux set what it needs for all it's devices to work. I
> > >> think the way to go forward is a
> > maintainer decision.
> > >
> > > I agree, there can be n number of solution for a problem.
> > >
> > > Since you modelled system state signal (USB PWRRDY) as reset control
> > > signal, it is reset/DT maintainer's decision to say the final word
> > > whether this signal fits in reset
> > system framework or not?
> >
> > I was thinking:
> > 1/ Geert would be the best to say if he considers it OK to handle this
> >    in Linux
> 
> I agree Geert is the right person for taking SYSTEM decisions, since the signal is used only during
> state transitions (Table 41.6.4 AWO to ALL_ON and 41.6.3 ALL_ON to AWO)

One more info, as per [1], this USB PWRRDY signal setting to be before Linux kernel boots.

All clocks/reset happens after setting USB PWRRDY signal

https://pasteboard.co/qbz021q7KPyi.png

Cheers,
Biju




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