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Message-ID: <50F7C643.600@ti.com>
Date: Thu, 17 Jan 2013 11:37:07 +0200
From: Roger Quadros <rogerq@...com>
To: Kishon Vijay Abraham I <kishon@...com>
CC: <devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-usb@...r.kernel.org>, <linux-sh@...r.kernel.org>,
<linuxppc-dev@...ts.ozlabs.org>, <balbi@...com>,
<grant.likely@...retlab.ca>, <rob.herring@...xeda.com>,
<rob@...dley.net>, <b-cousson@...com>, <tony@...mide.com>,
<linux@....linux.org.uk>, <horms@...ge.net.au>,
<magnus.damm@...il.com>, <cbou@...l.ru>, <dwmw2@...radead.org>,
<alexander.shishkin@...ux.intel.com>, <gregkh@...uxfoundation.org>,
<leoli@...escale.com>, <eric.y.miao@...il.com>,
<haojian.zhuang@...il.com>, <stern@...land.harvard.edu>
Subject: Re: [RFC PATCH 1/6] usb: otg: Add an API to bind the USB controller
and PHY
On 01/16/2013 05:00 PM, Kishon Vijay Abraham I wrote:
> New platforms are added which has multiple PHY's (of same type) and
> which has multiple USB controllers. The binding information has to be
> present in the PHY library (otg.c) in order for it to return the
> appropriate PHY whenever the USB controller request for the PHY. So
> added a new API to pass the binding information. This API should be
> called by platform specific initialization code.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
> drivers/usb/otg/otg.c | 37 +++++++++++++++++++++++++++++++++++++
> include/linux/usb/phy.h | 22 ++++++++++++++++++++++
> 2 files changed, 59 insertions(+)
>
> diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c
> index a30c041..492ba2f 100644
> --- a/drivers/usb/otg/otg.c
> +++ b/drivers/usb/otg/otg.c
> @@ -18,6 +18,7 @@
> #include <linux/usb/otg.h>
>
> static LIST_HEAD(phy_list);
> +static LIST_HEAD(phy_bind_list);
> static DEFINE_SPINLOCK(phy_lock);
>
> static struct usb_phy *__usb_find_phy(struct list_head *list,
> @@ -201,6 +202,42 @@ void usb_remove_phy(struct usb_phy *x)
> }
> EXPORT_SYMBOL(usb_remove_phy);
>
> +/**
> + * usb_bind_phy - bind the phy and the controller that uses the phy
> + * @dev_name: the device name of the device that will bind to the phy
> + * @index: index to specify the port number
> + * @phy_dev_name: the device name of the phy
> + *
> + * Fills the phy_bind structure with the dev_name and phy_dev_name. This will
> + * be used when the phy driver registers the phy and when the controller
> + * requests this phy.
> + *
> + * To be used by platform specific initialization code.
> + */
> +struct usb_phy_bind __init *usb_bind_phy(const char *dev_name, u8 index,
> + const char *phy_dev_name)
> +{
> + struct usb_phy_bind *phy_bind;
> + unsigned long flags;
> +
> + phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL);
> + if (!phy_bind) {
> + pr_err("phy_bind(): No memory for phy_bind");
Function name in comment doesn't match the actual.
Instead, you could use
pr_err("%s ...", __func__);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + phy_bind->dev_name = dev_name;
> + phy_bind->phy_dev_name = phy_dev_name;
> + phy_bind->index = index;
> +
> + spin_lock_irqsave(&phy_lock, flags);
> + list_add_tail(&phy_bind->list, &phy_bind_list);
> + spin_unlock_irqrestore(&phy_lock, flags);
> +
> + return phy_bind;
> +}
> +EXPORT_SYMBOL_GPL(usb_bind_phy);
> +
> const char *otg_state_string(enum usb_otg_state state)
> {
> switch (state) {
> diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
> index a29ae1e..fbeab1a 100644
> --- a/include/linux/usb/phy.h
> +++ b/include/linux/usb/phy.h
> @@ -106,6 +106,21 @@ struct usb_phy {
> enum usb_device_speed speed);
> };
>
> +/**
> + * struct usb_phy_bind - represent the binding for the phy
> + * @dev_name: the device name of the device that will bind to the phy
> + * @phy_dev_name: the device name of the phy
> + * @index: used if a single controller uses multiple phys
> + * @phy: reference to the phy
> + * @list: to maintain a linked list of the binding information
> + */
> +struct usb_phy_bind {
> + const char *dev_name;
> + const char *phy_dev_name;
> + u8 index;
> + struct usb_phy *phy;
> + struct list_head list;
> +};
>
> /* for board-specific init logic */
> extern int usb_add_phy(struct usb_phy *, enum usb_phy_type type);
> @@ -151,6 +166,8 @@ extern struct usb_phy *devm_usb_get_phy(struct device *dev,
> enum usb_phy_type type);
> extern void usb_put_phy(struct usb_phy *);
> extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x);
> +extern struct usb_phy_bind *usb_bind_phy(const char *dev_name, u8 index,
> + const char *phy_dev_name);
> #else
> static inline struct usb_phy *usb_get_phy(enum usb_phy_type type)
> {
> @@ -171,6 +188,11 @@ static inline void devm_usb_put_phy(struct device *dev, struct usb_phy *x)
> {
> }
>
> +static inline struct usb_phy_bind *usb_bind_phy(const char *dev_name, u8 index,
> + const char *phy_dev_name)
> +{
> + return NULL;
> +}
> #endif
>
> static inline int
>
Controllers like ehci-omap which don't need OTG functionality would
benefit from this API. Can we make these PHY APIs not dependent on OTG /
OTG_UTILS?
cheers,
-roger
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