linux-kernel - Re: [PATCH v3 4/9] ARM: dts: bcm2711: Add reset controller to xHCI node

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Message-ID: <9450f86c15ecd8435bcdbc395f8674172a975100.camel@suse.de>
Date:   Wed, 17 Jun 2020 21:21:31 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     f.fainelli@...il.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-usb@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com, tim.gover@...pberrypi.org,
        linux-pci@...r.kernel.org, andy.shevchenko@...il.com,
        mathias.nyman@...ux.intel.com, lorenzo.pieralisi@....com,
        devicetree@...r.kernel.org, wahrenst@....net,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH v3 4/9] ARM: dts: bcm2711: Add reset controller to xHCI
 node

Hi All,

On Fri, 2020-06-12 at 19:13 +0200, Nicolas Saenz Julienne wrote:
> The chip is hardwired to the board's PCIe bus and needs to be properly
> setup trough a firmware routine after a PCI fundamental reset. Pass the
> reset controller phandle that takes care of triggering the
> initialization to the relevant PCI device.
>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
>
> ---
>
> Changes since v2:
>  - Use dt-bindings to access IDs
>
> Changes since v1:
>  - Update to match new binding
>
>  arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
> b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
> index 0cef95058fb0..e20979013414 100644
> --- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
> +++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
> @@ -4,6 +4,8 @@
>  #include "bcm2835-rpi.dtsi"
>  #include "bcm283x-rpi-usb-peripheral.dtsi"
>
> +#include <dt-bindings/reset/raspberrypi,firmware-reset.h>
> +
>  / {
>  	compatible = "raspberrypi,4-model-b", "brcm,bcm2711";
>  	model = "Raspberry Pi 4 Model B";
> @@ -207,6 +209,13 @@ phy1: ethernet-phy@1 {
>  	};
>  };
>
> +&pcie0 {
> +	usb@1,0 {
> +		reg = <0 0 0 0 0>;
> +		resets = <&reset RASPBERRYPI_FIRMWARE_RESET_ID_USB>;
> +	};
> +};
> +

I'm now double-guessing this is correct. With this lspci -tv output:

[0000:00]---00.0-[01]----00.0  VIA Technologies, Inc. VL805 USB 3.0 Host Controller

The DT patch should be more like this:

+&pcie0 {
+       pci@0 {
+               #address-cells = <3>;
+               #size-cells = <2>;
+               ranges;
+
+               reg = <0 0 0 0 0>;
+
+               usb@1,0 {
+                       reg = <0x10000 0 0 0 0>;
+                       resets = <&reset RASPBERRYPI_FIRMWARE_RESET_ID_USB>;
+               };
+       };
+};

Small details aside I'm pretty confident this is the way to go, but would
appreciate some comments/validation.

Regards,
Nicolas


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