linux-kernel - Re: [PATCH] dt-bindings: usb: dwc3: Add interrupt-names to include hibernation interrupt

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Message-ID: <46b9bb31-efb5-1e1f-9d01-3841661293dc@amd.com>
Date:   Thu, 15 Sep 2022 11:04:56 +0200
From:   Michal Simek <michal.simek@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "Mehta, Piyush" <piyush.mehta@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "balbi@...nel.org" <balbi@...nel.org>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Paladugu, Siva Durga Prasad" <siva.durga.prasad.paladugu@....com>,
        Manish Narani <manish.narani@...inx.com>
Subject: Re: [PATCH] dt-bindings: usb: dwc3: Add interrupt-names to include
 hibernation interrupt



On 9/15/22 10:44, Krzysztof Kozlowski wrote:
> On 14/09/2022 14:15, Mehta, Piyush wrote:
>>   
>>> Where is the user (DTS) and implementation of this change? If this is specific
>>> to Xilinx, why you do not have device specific compatible?
>> [Piyush]:
>> We have dedicated irq line for hibernation feature,  "hiber" irq line triggers hibernation interrupt.
>> DWC3 core supports the hibernation feature, we have a dedicated code which is yet to be upstreamed.
>> As the hibernation feature provided by dwc3-core, so this will be supported by other SOC/vendors.
> 
> But is hiber irq line present in other vendors? What confuses me is
> adding not only "hiber" irq but also otg in completely new enum.

I will let Piyush to comment hiber IRQ. But I expect we don't have visibility 
what others are doing but this is line is not Xilinx invention that's why I 
expect IP from Synopsys have it by default but it is up to soc vendor if 
hibernation feature is enabled or not.

otg is already listed in
Documentation/devicetree/bindings/usb/snps,dwc3.yaml

It is only about order.
Driver is already using
platform_get_irq_byname..() functions

I think any combination should be fine. Do we need to record used order or there 
is way in yaml to support any combination with dwc_usb3, host, peripheral, otg 
should be working (ignoring that hiber which should be likely there too).

Thanks,
Michal