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From: Jack Pham <>
To: Manu Gautam <>
	Greg Kroah-Hartman <>
Subject: Re: [PATCH v2 2/3] usb: dwc3: Add Qualcomm DWC3 glue driver
Date: Fri, 13 Apr 2018 10:33:22 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Hi Manu,

On Fri, Apr 13, 2018 at 10:21:23PM +0530, 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 <>


> +static int dwc3_qcom_register_extcon(struct dwc3_qcom *qcom)
> +{
> +	struct device		*dev = qcom->dev;
> +	struct extcon_dev	*host_edev;
> +	int			ret;
> +
> +	if (!of_property_read_bool(dev->of_node, "extcon"))
> +		return 0;
> +
> +	qcom->edev = extcon_get_edev_by_phandle(dev, 0);

Are the extcon phandles bound to the glue node? I don't see the
description in the bindings doc in PATCH 1/3. And if so, would it be
a duplicate of the child node's extcon binding? Then again, the
alternative would be to grab it directly from the child (i.e.
qcom->dwc3->dev.of_node) which I'm not sure is ok to do or not.

The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

  reply	other threads:[~2018-04-13 17:33 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-13 16:51 [PATCH v2 0/3] usb: dwc3: support for Qualcomm DWC3 glue Manu Gautam
2018-04-13 16:51 ` [PATCH v2 1/3] dt-bindings: usb: Update documentation for Qualcomm DWC3 driver Manu Gautam
2018-04-16 20:38   ` Rob Herring
2018-04-17  3:39     ` Manu Gautam
2018-04-13 16:51 ` [PATCH v2 2/3] usb: dwc3: Add Qualcomm DWC3 glue driver Manu Gautam
2018-04-13 17:33   ` Jack Pham [this message]
2018-04-13 18:02     ` Manu Gautam
2018-04-13 18:23       ` Jack Pham
2018-04-13 16:51 ` [PATCH v2 3/3] usb: dwc3: core: Suspend PHYs on runtime suspend in host mode Manu Gautam

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