linux-kernel - Re: [PATCH v3 4/5] dt-bindings: usb/ti,am62-usb.yaml: Add PHY2 register space

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Date: Thu, 1 Feb 2024 12:35:22 -0600
From: Bin Liu <b-liu@...com>
To: Conor Dooley <conor@...nel.org>
CC: Roger Quadros <rogerq@...nel.org>, <nm@...com>, <vigneshr@...com>,
        <afd@...com>, <kristo@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <srk@...com>, <r-gunasekaran@...com>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 4/5] dt-bindings: usb/ti,am62-usb.yaml: Add PHY2
 register space

On Thu, Feb 01, 2024 at 06:18:05PM +0000, Conor Dooley wrote:
> On Thu, Feb 01, 2024 at 06:15:20PM +0000, Conor Dooley wrote:
> > On Thu, Feb 01, 2024 at 02:03:31PM +0200, Roger Quadros wrote:
> > > So far this was not required but due to the newly identified
> > > Errata i2409 [1] we need to poke this register space.
> > > 
> > > [1] https://www.ti.com/lit/er/sprz487d/sprz487d.pdf
> > > 
> > > Signed-off-by: Roger Quadros <rogerq@...nel.org>
> > 
> > Acked-by: Conor Dooley <conor.dooley@...rochip.com>
> 
> Actually, where is the user for this that actually pokes the register
> space?
> You're adding another register region, so I went to check how you were
> handling that in drivers, but there's no driver patch.

See Roger's another patch set 'Add workaround for Errata i2409' posted
on 16th.

-Bin.

> 
> 
> > 
> > > ---
> > > 
> > > Notes:
> > >     Changelog:
> > >     
> > >     v3 - new patch
> > > 
> > >  Documentation/devicetree/bindings/usb/ti,am62-usb.yaml | 7 +++++--
> > >  1 file changed, 5 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/usb/ti,am62-usb.yaml b/Documentation/devicetree/bindings/usb/ti,am62-usb.yaml
> > > index fec5651f5602..c02d9d467d9c 100644
> > > --- a/Documentation/devicetree/bindings/usb/ti,am62-usb.yaml
> > > +++ b/Documentation/devicetree/bindings/usb/ti,am62-usb.yaml
> > > @@ -14,7 +14,9 @@ properties:
> > >      const: ti,am62-usb
> > >  
> > >    reg:
> > > -    maxItems: 1
> > > +    items:
> > > +      - description: USB CFG register space
> > > +      - description: USB PHY2 register space
> > >  
> > >    ranges: true
> > >  
> > > @@ -82,7 +84,8 @@ examples:
> > >  
> > >        usbss1: usb@...0000 {
> > >          compatible = "ti,am62-usb";
> > > -        reg = <0x00 0x0f910000 0x00 0x800>;
> > > +        reg = <0x00 0x0f910000 0x00 0x800>,
> > > +              <0x00 0x0f918000 0x00 0x400>;
> > 
> > Why the double zeros btw?
> > 
> > Cheers,
> > Conor.
> > 
> > >          clocks = <&k3_clks 162 3>;
> > >          clock-names = "ref";
> > >          ti,syscon-phy-pll-refclk = <&wkup_conf 0x4018>;
> > > -- 
> > > 2.34.1
> > > 
> 
>