linux-kernel - Re: [PATCH RFC] usb: chipidea: add support for usb

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Date:	Mon, 5 Jan 2015 11:09:35 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Baruch Siach <baruch@...s.co.il>, Felipe Balbi <balbi@...com>,
	Peter Chen <Peter.Chen@...escale.com>
CC:	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Antoine Tenart <antoine.tenart@...e-electrons.com>
Subject: Re: [PATCH RFC] usb: chipidea: add support for usb_phy in generic
 usb2

Hi,

On Sunday 04 January 2015 11:58 AM, Baruch Siach wrote:
> Signed-off-by: Baruch Siach <baruch@...s.co.il>
> ---
>  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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