linux-kernel - Re: [PATCH v2 1/6] dt-bindings: usb: dwc3: Clean up hs_phy

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Message-ID: <20231208162923.GA1635292-robh@kernel.org>
Date:   Fri, 8 Dec 2023 10:29:23 -0600
From:   Rob Herring <robh@...nel.org>
To:     Krishna Kurapati <quic_kriskura@...cinc.com>
Cc:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Johan Hovold <johan@...nel.org>,
        cros-qcom-dts-watchers@...omium.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, quic_ppratap@...cinc.com,
        quic_jackp@...cinc.com
Subject: Re: [PATCH v2 1/6] dt-bindings: usb: dwc3: Clean up hs_phy_irq in
 bindings

On Mon, Dec 04, 2023 at 03:39:45PM +0530, Krishna Kurapati wrote:
> The high speed related interrupts present on QC targets are as follows:
> 
> dp/dm irq's
> These IRQ's directly reflect changes on the DP/DM pads of the SoC. These
> are used as wakeup interrupts only on SoCs with non-QUSB2 targets with
> exception of SDM670/SDM845/SM6350.
> 
> qusb2_phy irq
> SoCs with QUSB2 PHY do not have separate DP/DM IRQs and expose only a
> single IRQ whose behavior can be modified by the QUSB2PHY_INTR_CTRL
> register. The required DPSE/DMSE configuration is done in
> QUSB2PHY_INTR_CTRL register of phy address space.
> 
> hs_phy_irq
> This is completely different from the above two and is present on all
> targets with exception of a few IPQ ones. The interrupt is not enabled by
> default and its functionality is mutually exclusive of qusb2_phy on QUSB
> targets and DP/DM on femto phy targets.
> 
> The DTs of several QUSB2 PHY based SoCs incorrectly define "hs_phy_irq"
> when they should have been "qusb2_phy_irq". On Femto phy targets, the
> "hs_phy_irq" mentioned is either the actual "hs_phy_irq" or "pwr_event",
> neither of which would never be triggered directly are non-functional
> currently. The implementation tries to clean up this issue by addressing
> the discrepencies involved and fixing the hs_phy_irq's in respective DT's.
> 
> Classify interrupts based on whether qusb2_phy interrupt is used or
> {dp/dm}_hs_phy_irq is used and whether hs_phy_irq is present or not.
> 
> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
> ---
>  .../devicetree/bindings/usb/qcom,dwc3.yaml    | 147 +++++++-----------
>  1 file changed, 58 insertions(+), 89 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
> index 3ec62027f663..94deef765ec3 100644
> --- a/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
> @@ -98,12 +98,30 @@ properties:
>        - const: apps-usb
>  
>    interrupts:
> -    minItems: 1
> -    maxItems: 4
> +    description: |
> +      Different types of interrupts are used based on HS phy used on target::

Why the double colon? This isn't rSt.

Rob