linux-kernel - Re: [PATCH v3 01/13] dt-bindings: usb: tegra-xudc: Add Tegra234 XUSB controller support

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Message-ID: <8d1d3ef9-2fee-12ab-3297-680ec9df5a40@nvidia.com>
Date:   Thu, 17 Nov 2022 12:05:30 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Rob Herring <robh@...nel.org>, Wayne Chang <waynec@...dia.com>
Cc:     gregkh@...uxfoundation.org, krzysztof.kozlowski+dt@...aro.org,
        treding@...dia.com, thierry.reding@...il.com,
        heikki.krogerus@...ux.intel.com, ajayg@...dia.com,
        vkoul@...nel.org, p.zabel@...gutronix.de, balbi@...nel.org,
        mathias.nyman@...el.com, jckuo@...dia.com,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, singhanc@...dia.com,
        linux-i2c@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH v3 01/13] dt-bindings: usb: tegra-xudc: Add Tegra234 XUSB
 controller support


On 16/11/2022 21:05, Rob Herring wrote:
> On Mon, Nov 14, 2022 at 08:40:41PM +0800, Wayne Chang wrote:
>> Extend the Tegra XUSB controller device tree binding with Tegra234
>> support.
> 
> Why do you need any order and number of phys? Please explain in the
> commit msg.

I have been having a quick look at this and for the devices that
this binding is applicable to, they only support one port for USB2
and one port for USB3. So I don't think that we should have all
these ports defined in this binding doc. So ideally, we should have
...

diff --git a/Documentation/devicetree/bindings/usb/nvidia,tegra-xudc.yaml b/Documentation/devicetree/bindings/usb/nvidia,tegra-xudc.yaml
index 52488a731c4e..031796b68bbb 100644
--- a/Documentation/devicetree/bindings/usb/nvidia,tegra-xudc.yaml
+++ b/Documentation/devicetree/bindings/usb/nvidia,tegra-xudc.yaml
@@ -98,17 +98,9 @@ properties:
  
    phy-names:
      minItems: 1
-    maxItems: 8
      items:
-      enum:
-        - usb2-0
-        - usb2-1
-        - usb2-2
-        - usb2-3
-        - usb3-0
-        - usb3-1
-        - usb3-2
-        - usb3-3
+      - const: usb2
+      - const: usb3
  
    dma-coherent:
      type: boolean
diff --git a/arch/arm64/boot/dts/nvidia/tegra234-p3737-0000+p3701-0000.dts b/arch/arm64/boot/dts/nvidia/tegra234-p3737-0000+p3701-0000.dts
index 0556bc64287d..349a98119608 100644
--- a/arch/arm64/boot/dts/nvidia/tegra234-p3737-0000+p3701-0000.dts
+++ b/arch/arm64/boot/dts/nvidia/tegra234-p3737-0000+p3701-0000.dts
@@ -2128,7 +2128,7 @@ usb@...0000 {
  
                         phys = <&{/bus@...adctl@...0000/pads/usb2/lanes/usb2-0}>,
                                 <&{/bus@...adctl@...0000/pads/usb3/lanes/usb3-1}>;
-                       phy-names = "usb2-0", "usb3-1";
+                       phy-names = "usb2", "usb3";
                 };
  
                 usb@...0000 {

Jon

-- 
nvpublic