Re: [PATCH RFC] usb: chipidea: add support for usb_phy in generic usb2

From: Kishon Vijay Abraham I
Date: Mon Jan 05 2015 - 00:40:01 EST


Hi,

On Sunday 04 January 2015 11:58 AM, Baruch Siach wrote:
> Signed-off-by: Baruch Siach <baruch@xxxxxxxxxx>
> ---
> drivers/usb/chipidea/ci_hdrc_usb2.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> I'm sending this as RFC as I'm not sure this is the right thing to do. There
> seems to be a move away from USB specific PHY drivers towards the generic PHY
> framework (drivers/phy). The trouble is that my PHY is similar to the mxs PHY
> (phy-mxs-usb.c), and like mxs I need the notify_connect/notify_disconnect
> callbacks. This functionality is not available is the generic PHY
> framework. Having support for both 'usb-phy' and 'phy' properties (as dwc3
> seems to do) is particularly bad, since the distinction between the two is a
> Linux implementation detail that has nothing to do with hardware description.
>
> So my questions are:
>
> 1. Is there a plan to add notifications support to the generic PHY?
>
> 2. If not, what are my options?

extcon framework has notification support. I feel your driver should use the
extcon framework along with phy framework.

Adding extcon support in the generic PHY framework is something I have not
thought through in detail.

Thanks
Kishon

>
> Thanks,
> baruch
>
> diff --git a/drivers/usb/chipidea/ci_hdrc_usb2.c b/drivers/usb/chipidea/ci_hdrc_usb2.c
> index 45844c951788..cc3aeb781a57 100644
> --- a/drivers/usb/chipidea/ci_hdrc_usb2.c
> +++ b/drivers/usb/chipidea/ci_hdrc_usb2.c
> @@ -35,11 +35,16 @@ static int ci_hdrc_usb2_probe(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct ci_hdrc_usb2_priv *priv;
> struct ci_hdrc_platform_data *ci_pdata = dev_get_platdata(dev);
> + struct usb_phy *usb_phy;
> int ret;
>
> if (!ci_pdata)
> ci_pdata = &ci_default_pdata;
>
> + usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
> + if (!IS_ERR(usb_phy))
> + ci_pdata->usb_phy = usb_phy;
> +
> priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> if (!priv)
> return -ENOMEM;
>
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