linux-kernel - Re: [PATCH v2 1/3] dt-bindings: usb: add rk3588 compatible to rockchip,dwc3

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Message-ID: <20230731-decipher-smuggler-2f83caa8c616@spud>
Date:   Mon, 31 Jul 2023 16:32:40 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-rockchip@...ts.infradead.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v2 1/3] dt-bindings: usb: add rk3588 compatible to
 rockchip,dwc3

On Mon, Jul 31, 2023 at 05:12:24PM +0200, Sebastian Reichel wrote:
> Hi,
> 
> On Sat, Jul 22, 2023 at 12:42:09PM +0100, Conor Dooley wrote:
> > On Thu, Jul 20, 2023 at 07:36:41PM +0200, Sebastian Reichel wrote:
> > > RK3588 has three DWC3 controllers. Two of them are fully functional in
> > > host, device and OTG mode including USB2 support. They are connected to
> > > dedicated PHYs, that also support USB-C's DisplayPort alternate mode.
> > > 
> > > The third controller is connected to one of the combphy's shared
> > > with PCIe and SATA. It can only be used in host mode and does not
> > > support USB2. Compared to the other controllers this one needs
> > > some extra clocks.
> > > 
> > > Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> > 
> > I feel like I say it a bunch for some of these Rockchip bindings
> > patches, but if you're adding more clocks for some SoCs, should some
> > per-SoC constraints not also be added?
> 
> The extra clocks are not actually needed by all the USB3 controllers
> in the SoC. Only one of three USB3 controllers needs them. In v1 I
> used different compatible values to narrow the clock binding down
> and Krzysztof asked to remove that. So please tell me what it should
> look like.

Maybe Krzysztof and I were talking about different things. I was talking
about constraining !3588 SoCs so that nobody tries to use a utmi and
pipe clock on those, and only allowing them on a 3588. AFAICT, what
Krzysztof objected to was having more than one compatible for
controllers on the 3588. Maybe he weigh in.

Thanks,
Conor.

> > > ---
> > >  .../devicetree/bindings/usb/rockchip,dwc3.yaml        | 11 +++++++++--
> > >  1 file changed, 9 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml b/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml
> > > index 291844c8f3e1..cbc3e55e05e1 100644
> > > --- a/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml
> > > +++ b/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml
> > > @@ -30,6 +30,7 @@ select:
> > >          enum:
> > >            - rockchip,rk3328-dwc3
> > >            - rockchip,rk3568-dwc3
> > > +          - rockchip,rk3588-dwc3
> > >    required:
> > >      - compatible
> > >  
> > > @@ -39,6 +40,7 @@ properties:
> > >        - enum:
> > >            - rockchip,rk3328-dwc3
> > >            - rockchip,rk3568-dwc3
> > > +          - rockchip,rk3588-dwc3
> > >        - const: snps,dwc3
> > >  
> > >    reg:
> > > @@ -58,7 +60,9 @@ properties:
> > >            Master/Core clock, must to be >= 62.5 MHz for SS
> > >            operation and >= 30MHz for HS operation
> > >        - description:
> > > -          Controller grf clock
> > > +          Controller grf clock OR UTMI clock
> > > +      - description:
> > > +          PIPE clock
> > >  
> > >    clock-names:
> > >      minItems: 3
> > > @@ -66,7 +70,10 @@ properties:
> > >        - const: ref_clk
> > >        - const: suspend_clk
> > >        - const: bus_clk
> > > -      - const: grf_clk
> > > +      - enum:
> > > +          - grf_clk
> > > +          - utmi
> > > +      - const: pipe
> > >  
> > >    power-domains:
> > >      maxItems: 1
> > > -- 
> > > 2.40.1
> > > 
> 
> 



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