linux-kernel - Re: [PATCH 1/6] dt-bindings: usb: dwc3: Clean up hs_phy

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Date:   Tue, 28 Nov 2023 11:57:50 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, quic_wcheng@...cinc.com,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_ppratap@...cinc.com, quic_jackp@...cinc.com
Subject: Re: [PATCH 1/6] dt-bindings: usb: dwc3: Clean up hs_phy_irq in
 bindings

On Tue, Nov 28, 2023 at 04:02:53PM +0530, Krishna Kurapati PSSNV wrote:

> >    >> My opinion would be to keep the power_event irq as mandatory and not to
> >> include the hs_phy_irq.
> > 
> > Ok, but you still need to explain why dropping hs_phy_irq is correct.
> > 
> > Until there's a clear answer to that, it seems we need to include it.
> 
> Sure, I agree with you. It should describe what hardware is capable of, 
> not what we choose to add in driver code. In that sense we can add the 
> hs_phy_irq to all targets.
> 
> In my next revision, I can do the following:
> 
> 	- anyOf:
> 	  - items:
> 	    - const: qusb2_phy
> 	  - items:
> 	    - const: dp_hs_phy_irq
> 	    - const: dm_hs_phy_irq
> 	- const: hs_phy_irq
> 	- const: pwr_event
> 	- const: ss_phy_irq	(optional)
> 
> A modified version of your suggestion should help cover all cases and 
> describe all DT's perfectly.

It may be better to spell out the permutations. Especially since there
are no platforms with both qusb2_phy and dp/dm as I thought when
mentioning the above. Using anyOf also makes it hard to specify
min/maxItems as you'll need to do.

So back to my initial proposal, with a slight modification moving
pwr_event first (e.g. as it is not a wakeup interrupt):

qusb2-:

	- const: pwr_event
	- const: qusb2_phy
	- const: ss_phy_irq	(optional)

qusb2:

	- const: pwr_event
	- const: hs_phy_irq
	- const: qusb2_phy
	- const: ss_phy_irq	(optional)

femto-:
	- const: pwr_event
	- const: dp_hs_phy_irq
	- const: dm_hs_phy_irq
	- const: ss_phy_irq	(optional)

femto:
	- const: pwr_event
	- const: hs_phy_irq
	- const: dp_hs_phy_irq
	- const: dm_hs_phy_irq
	- const: ss_phy_irq	(optional)

That ss_phy_irq is optional would be expressed as minItems being one
less than maxItems for each permutation.

Johan