linux-kernel - Re: [PATCH v2 1/7] dt-bindings: usb: document the Renesas UPD720201/UPD720202 USB 3.0 xHCI Host Controller

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Message-ID: <CAMuHMdU9HcK3xX=itqe2di1HS1SJvV6=ySqKyrtj7Yr1yXyuqQ@mail.gmail.com>
Date: Tue, 27 Jan 2026 11:20:59 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, Rob Clark <robin.clark@....qualcomm.com>, 
	Dmitry Baryshkov <lumag@...nel.org>, Abhinav Kumar <abhinav.kumar@...ux.dev>, 
	Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, Magnus Damm <magnus.damm@...il.com>, 
	Bartosz Golaszewski <brgl@...nel.org>, Manivannan Sadhasivam <mani@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, linux-usb@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 1/7] dt-bindings: usb: document the Renesas
 UPD720201/UPD720202 USB 3.0 xHCI Host Controller

Hi Neil,

On Tue, 27 Jan 2026 at 10:57, Neil Armstrong <neil.armstrong@...aro.org> wrote:
> Document the Renesas UPD720201/UPD720202 USB 3.0 xHCI Host Controller,
> which connects over PCIe and requires specific power supplies to

Here: "requires"...

> start up.
>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  .../bindings/usb/renesas,upd720201-pci.yaml        | 55 ++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/usb/renesas,upd720201-pci.yaml b/Documentation/devicetree/bindings/usb/renesas,upd720201-pci.yaml
> new file mode 100644
> index 000000000000..df3cdcf44747
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/renesas,upd720201-pci.yaml
> @@ -0,0 +1,55 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/renesas,upd720201-pci.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: UPD720201/UPD720202 USB 3.0 xHCI Host Controller (PCIe)
> +
> +maintainers:
> +  - Neil Armstrong <neil.armstrong@...aro.org>
> +
> +description:
> +  UPD720201 USB 3.0 xHCI Host Controller via PCIe x1 Gen2 interface.
> +  The UPD720202 up to two downstream ports, while UPD720201 supports up to
> +  four downstream USB 3.0 rev1.0 ports.
> +
> +properties:
> +  compatible:
> +    const: pci1912,0014

Just wondering: how does having a new driver
drivers/pci/pwrctrl/pci-pwrctrl-upd720201.c matching against this
compatible play well with normal PCI discovery and probing of
drivers/usb/host/xhci-pci-renesas.c?

> +
> +  reg:
> +    maxItems: 1
> +
> +  avdd33-supply:
> +    description: +3.3 V power supply for analog circuit
> +
> +  vdd10-supply:
> +    description: +1.05 V power supply
> +
> +  vdd33-supply:
> +    description: +3.3 V power supply
> +
> +required:
> +  - compatible
> +  - reg

... but no power supplies are listed here? ...

> +
> +allOf:
> +  - $ref: usb-xhci.yaml
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    pcie@0 {
> +        reg = <0x0 0x1000>;
> +        ranges = <0x02000000 0x0 0x100000 0x10000000 0x0 0x0>;
> +        #address-cells = <3>;
> +        #size-cells = <2>;
> +        device_type = "pci";
> +
> +        usb@0 {

The actual DTS uses "usb-controller".

> +            compatible = "pci1912,0014";
> +            reg = <0x0 0x0 0x0 0x0 0x0>;

... also not in the example?

> +        };
> +    };
>
> --
> 2.34.1

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds