linux-kernel - Re: [PATCH v3 2/3] usb: dwc3: Add Qualcomm DWC3 glue driver

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Message-ID: <7bc35d33-c819-fb64-353c-f64dce08505f@codeaurora.org>
Date:   Tue, 8 May 2018 09:36:48 +0530
From:   Manu Gautam <mgautam@...eaurora.org>
To:     balbi@...nel.org, robh@...nel.org, andy.gross@...aro.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        linux-arm-msm@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v3 2/3] usb: dwc3: Add Qualcomm DWC3 glue driver



On 5/5/2018 12:18 AM, Manu Gautam wrote:
> DWC3 controller on Qualcomm SOCs has a Qscratch wrapper.
> Some of its uses are described below resulting in need to
> have a separate glue driver instead of using dwc3-of-simple:
>  - It exposes register interface to override vbus-override
>    and lane0-pwr-present signals going to hardware. These
>    must be updated in peripheral mode for DWC3 if vbus lines
>    are not connected to hardware block. Otherwise RX termination
>    in SS mode or DP pull-up is not applied by device controller.
>  - pwr_events_irq_stat support to check if USB2 PHY is in L2 state
>    before glue driver proceeds with suspend.
>  - Support for wakeup interrupts lines that are asserted whenever
>    there is any wakeup event on USB3 or USB2 bus.
>  - Support to replace pip3 clock going to DWC3 with utmi clock
>    for hardware configuration where SSPHY is not used with DWC3.
>
> Signed-off-by: Manu Gautam <mgautam@...eaurora.org>
[snip]
> +static const struct of_device_id dwc3_qcom_of_match[] = {
> +	{ .compatible = "qcom,dwc3" },

I should also add SOC specific compatibles.
Will do that in next patch.


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