linux-kernel - Re: [PATCH v2 2/6] usb: otg: utils: add facilities in phy lib to support multiple PHYs of same type

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Date:	Fri, 01 Feb 2013 22:54:49 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Kishon Vijay Abraham I <kishon@...com>
CC:	tony@...mide.com, balbi@...com, linux-usb@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux@....linux.org.uk,
	eballetbo@...il.com, javier@...hile0.org,
	gregkh@...uxfoundation.org
Subject: Re: [PATCH v2 2/6] usb: otg: utils: add facilities in phy lib to
 support multiple PHYs of same type

On 01/25/2013 03:33 AM, Kishon Vijay Abraham I wrote:
> In order to add support for multipe PHY's of the same type, new API's
> for adding PHY and getting PHY has been added. Now the binding
> information for the PHY and controller should be done in platform file
> using usb_bind_phy API. And for getting a PHY, the device pointer of the
> USB controller and an index should be passed. Based on the binding
> information that is added in the platform file, usb_get_phy_dev will return the
> appropriate PHY.
> Already existing API's to add and get phy by type is not removed. These
> API's are deprecated and will be removed once all the platforms start to
> use the new API.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/usb/otg/otg.c   |  118 ++++++++++++++++++++++++++++++++++++++++++++++-
>  include/linux/usb/phy.h |   13 ++++++
>  2 files changed, 130 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c
> index 8e756d9..4bb4333 100644
> --- a/drivers/usb/otg/otg.c
> +++ b/drivers/usb/otg/otg.c
> @@ -36,6 +36,24 @@ static struct usb_phy *__usb_find_phy(struct list_head *list,
>  	return ERR_PTR(-ENODEV);
>  }
>  
> +static struct usb_phy *__usb_find_phy_dev(struct device *dev,
> +	struct list_head *list, u8 index)
> +{
> +	struct usb_phy_bind *phy_bind = NULL;
> +
> +	list_for_each_entry(phy_bind, list, list) {
> +		if (!(strcmp(phy_bind->dev_name, dev_name(dev))) &&
> +				phy_bind->index == index) {
> +			if (phy_bind->phy)
> +				return phy_bind->phy;
> +			else
> +				return ERR_PTR(-EPROBE_DEFER);
> +		}
> +	}
> +
> +	return ERR_PTR(-ENODEV);
> +}
> +
>  static void devm_usb_phy_release(struct device *dev, void *res)
>  {
>  	struct usb_phy *phy = *(struct usb_phy **)res;
> @@ -112,6 +130,69 @@ err0:
>  EXPORT_SYMBOL(usb_get_phy);
>  
>  /**
> + * usb_get_phy_dev - find the USB PHY
> + * @dev - device that requests this phy
> + * @index - the index of the phy
> + *
> + * Returns the phy driver, after getting a refcount to it; or
> + * -ENODEV if there is no such phy.  The caller is responsible for
> + * calling usb_put_phy() to release that count.
> + *
> + * For use by USB host and peripheral drivers.
> + */
> +struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index)
> +{
> +	struct usb_phy	*phy = NULL;
> +	unsigned long	flags;
> +
> +	spin_lock_irqsave(&phy_lock, flags);
> +
> +	phy = __usb_find_phy_dev(dev, &phy_bind_list, index);
> +	if (IS_ERR(phy)) {

You should probably lock the phy module in memory. See my patch "usb:
otg: use try_module_get in all usb_get_phy functions and add missing
module_put".

Marc



-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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