Message-ID: <505322E3.4090806@pengutronix.de>
Date:	Fri, 14 Sep 2012 14:28:19 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Kishon Vijay Abraham I <kishon@...com>
CC:	balbi@...com, arnd@...db.de, gregkh@...uxfoundation.org,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, richard.zhao@...escale.com,
	B29397@...escale.com, alexander.shishkin@...ux.intel.com,
	marex@...x.de
Subject: Re: [RFC PATCH] drivers: phy: add generic PHY framework

On 09/14/2012 01:58 PM, Kishon Vijay Abraham I wrote:
> The PHY framework provides a set of API's for the PHY drivers to
> create/remove a PHY and the PHY users to obtain a reference to the PHY
> using or without using phandle. If the PHY users has to obtain a reference to
> the PHY without using phandle, the platform specfic intialization code (say
> from board file) should have already called phy_bind with the binding
> information. The binding information consists of phy's device name, phy
> user device name and an index. The index is used when the same phy user
> binds to mulitple phys.
> 
> PHY drivers should create the PHY by passing phy_descriptor that has
> information about the PHY and ops like init, exit, suspend, resume,
> poweron, shutdown.

Some comments inside.

While looking over the code, I was thinking why not abstract the phy
with a "bus" in the linux kernel. The ethernet phys are on the mdio_bus,
see /sys/bus/mdio_bus. This saves you hand crafting devices, drivers and
bindings,

Marc

> 
> Nyet-signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
> This framework is actually intended to be used by all the PHY drivers in the
> kernel. Though it's going to take a while for that, I intend to migrate
> existing USB/OTG phy drivers to use this framework as we align on the design
> of this framework. Once I migrate these phy drivers, I'll be able to test this
> framework (I haven't tested this framework so far). I sent this patch early
> so as to get review comments and align on the design. Thanks :-)
> 
>  drivers/Kconfig         |    2 +
>  drivers/Makefile        |    2 +
>  drivers/phy/Kconfig     |   13 ++
>  drivers/phy/Makefile    |    5 +
>  drivers/phy/phy-core.c  |  437 +++++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/phy/phy.h |  181 ++++++++++++++++++++
>  6 files changed, 640 insertions(+)
>  create mode 100644 drivers/phy/Kconfig
>  create mode 100644 drivers/phy/Makefile
>  create mode 100644 drivers/phy/phy-core.c
>  create mode 100644 include/linux/phy/phy.h
> 
> diff --git a/drivers/Kconfig b/drivers/Kconfig
> index ece958d..8488818 100644
> --- a/drivers/Kconfig
> +++ b/drivers/Kconfig
> @@ -152,4 +152,6 @@ source "drivers/vme/Kconfig"
>  
>  source "drivers/pwm/Kconfig"
>  
> +source "drivers/phy/Kconfig"
> +
>  endmenu
> diff --git a/drivers/Makefile b/drivers/Makefile
> index 5b42184..63d6bbe 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -38,6 +38,8 @@ obj-y				+= char/
>  # gpu/ comes after char for AGP vs DRM startup
>  obj-y				+= gpu/
>  
> +obj-y				+= phy/
> +
>  obj-$(CONFIG_CONNECTOR)		+= connector/
>  
>  # i810fb and intelfb depend on char/agp/
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> new file mode 100644
> index 0000000..34f7077
> --- /dev/null
> +++ b/drivers/phy/Kconfig
> @@ -0,0 +1,13 @@
> +#
> +# PHY
> +#
> +
> +menuconfig GENERIC_PHY
> +	tristate "Generic PHY Support"
> +	help
> +	  Generic PHY support.
> +
> +	  This framework is designed to provide a generic interface for PHY
> +	  devices present in the kernel. This layer will have the generic
> +	  API by which phy drivers can create PHY using the phy framework and
> +	  phy users can obtain reference to the PHY.
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> new file mode 100644
> index 0000000..9e9560f
> --- /dev/null
> +++ b/drivers/phy/Makefile
> @@ -0,0 +1,5 @@
> +#
> +# Makefile for the phy drivers.
> +#
> +
> +obj-$(CONFIG_GENERIC_PHY)	+= phy-core.o
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> new file mode 100644
> index 0000000..c55446a
> --- /dev/null
> +++ b/drivers/phy/phy-core.c
> @@ -0,0 +1,437 @@
> +/*
> + * phy-core.c  --  Generic Phy framework.
> + *
> + * Copyright (C) 2012 Texas Instruments
> + *
> + * Author: Kishon Vijay Abraham I <kishon@...com>
> + *
> + * This program is free software; you can redistribute  it and/or modify it
> + * under  the terms of  the GNU General  Public License as published by the
> + * Free Software Foundation;  either version 2 of the  License, or (at your
> + * option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/export.h>
> +#include <linux/module.h>
> +#include <linux/err.h>
> +#include <linux/device.h>
> +#include <linux/slab.h>
> +#include <linux/of.h>
> +#include <linux/phy/phy.h>
> +
> +static struct class *phy_class;
> +static LIST_HEAD(phy_list);
> +static DEFINE_MUTEX(phy_list_mutex);
> +static LIST_HEAD(phy_bind_list);
> +
> +static void devm_phy_release(struct device *dev, void *res)
> +{
> +	struct phy *phy = *(struct phy **)res;

What about adding a struct phy_res, doing so,m you don't need these
casts, and it's easier to add more pointers if needed.

> +
> +	phy_put(phy);
> +}
> +
> +static int devm_phy_match(struct device *dev, void *res, void *match_data)
> +{
> +	return res == match_data;
> +}
> +
> +static struct phy *phy_lookup(struct device *dev, u8 index)
> +{
> +	struct phy_bind *phy_bind = NULL;
> +
> +	list_for_each_entry(phy_bind, &phy_bind_list, list) {
> +		if (!(strcmp(phy_bind->dev_name, dev_name(dev))) &&
> +				phy_bind->index == index)
> +			return phy_bind->phy;
> +	}
> +
> +	return ERR_PTR(-ENODEV);
> +}
> +
> +static struct phy *of_phy_lookup(struct device *dev, struct device_node *node)
> +{
> +	int index = 0;
> +	struct phy  *phy;
                  ^^

Please remove that stray space.

> +	struct phy_bind *phy_map = NULL;
> +
> +	list_for_each_entry(phy_map, &phy_bind_list, list)
> +		if (!(strcmp(phy_map->dev_name, dev_name(dev))))
> +			index++;
> +
> +	list_for_each_entry(phy, &phy_list, head) {
> +		if (node != phy->desc->of_node)
> +			continue;
> +
> +		phy_map = phy_bind(dev_name(dev), index, dev_name(&phy->dev));
> +		if (!IS_ERR(phy_map)) {
> +			phy_map->phy = phy;
> +			phy_map->auto_bind = true;
> +		}
> +
> +		return phy;
> +	}
> +
> +	return ERR_PTR(-ENODEV);
> +}
> +
> +/**
> + * devm_phy_get - lookup and obtain a reference to a phy.
> + * @dev: device that requests this phy
> + * @index: the index of the phy
> + *
> + * Gets the phy using phy_get(), and associates a device with it using
> + * devres. On driver detach, release function is invoked on the devres data,
> + * then, devres data is freed.
> + */
> +struct phy *devm_phy_get(struct device *dev, u8 index)
> +{
> +	struct phy **ptr, *phy;
> +
> +	ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
> +	if (!ptr)
> +		return NULL;
> +
> +	phy = phy_get(dev, index);
> +	if (!IS_ERR(phy)) {
> +		*ptr = phy;
> +		devres_add(dev, ptr);
> +	} else
> +		devres_free(ptr);

nitpick: when when if has { }, else should have, too.

> +
> +	return phy;
> +}
> +EXPORT_SYMBOL_GPL(devm_phy_get);
> +
> +/**
> + * devm_phy_put - release the PHY
> + * @dev: device that wants to release this phy
> + * @phy: the phy returned by devm_phy_get()
> + *
> + * destroys the devres associated with this phy and invokes phy_put
> + * to release the phy.
> + */
> +void devm_phy_put(struct device *dev, struct phy *phy)
> +{
> +	int r;
> +
> +	r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
> +	dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
> +}
> +EXPORT_SYMBOL_GPL(devm_phy_put);
> +
> +/**
> + * devm_of_phy_get - lookup and obtain a reference to a phy by phandle
> + * @dev: device that requests this phy
> + * @phandle: name of the property holding the phy phandle value
> + *
> + * Returns the phy driver associated with the given phandle value,
> + * after getting a refcount to it or -ENODEV if there is no such phy.
> + * While at that, it also associates the device with the phy using devres.
> + * On driver detach, release function is invoked on the devres data,
> + * then, devres data is freed.
> + */
> +struct phy *devm_of_phy_get(struct device *dev, const char *phandle)

We should discuss first how the DT binding for a phy should look like. I
don't like that you hardcode the index (in of_parse_phandle()) to "0".
Then we have the problem with USB2 and USB3 phys for the same usb device.

> +{
> +	struct phy	*phy = NULL, **ptr;
> +	struct device_node *node;
> +
> +	if (!dev->of_node) {
> +		dev_dbg(dev, "device does not have a device node entry\n");
> +		return ERR_PTR(-EINVAL);
> +	}
> +
> +	node = of_parse_phandle(dev->of_node, phandle, 0);
> +	if (!node) {
> +		dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
> +			dev->of_node->full_name);
> +		return ERR_PTR(-ENODEV);
> +	}
> +
> +	ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
> +	if (!ptr) {
> +		dev_dbg(dev, "failed to allocate memory for devres\n");
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	mutex_lock(&phy_list_mutex);
> +
> +	phy = of_phy_lookup(dev, node);
> +	if (IS_ERR(phy) || !try_module_get(phy->dev.driver->owner)) {
> +		devres_free(ptr);
> +		goto err0;
> +	}

Please return -EPROBE_DEFER is the phy is not yet registered.

> +
> +	*ptr = phy;
> +	devres_add(dev, ptr);
> +
> +	get_device(&phy->dev);
> +
> +err0:
> +	mutex_unlock(&phy_list_mutex);
> +
> +	return phy;
> +}
> +EXPORT_SYMBOL_GPL(devm_of_phy_get);
> +
> +/**
> + * phy_get - lookup and obtain a reference to a 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 phy_put() to release that count.
> + */
> +struct phy *phy_get(struct device *dev, u8 index)
> +{
> +	struct phy	*phy = NULL;
> +
> +	mutex_lock(&phy_list_mutex);
> +
> +	phy = phy_lookup(dev, index);
> +	if (IS_ERR(phy)) {
> +		pr_err("unable to find phy\n");

dev_err()

> +		goto err0;
> +	}
> +
> +	get_device(&phy->dev);
> +
> +err0:
> +	mutex_unlock(&phy_list_mutex);
> +
> +	return phy;
> +}
> +EXPORT_SYMBOL_GPL(phy_get);
> +
> +/**
> + * phy_put - release the PHY
> + * @phy: the phy returned by phy_get()
> + *
> + * Releases a refcount the caller received from phy_get().
> + */
> +void phy_put(struct phy *phy)
> +{
> +	if (phy)
> +		put_device(&phy->dev);
> +}
> +EXPORT_SYMBOL_GPL(phy_put);
> +
> +/**
> + * create_phy - create a new phy
> + * @dev: device that is creating the new phy
> + * @desc: descriptor of the phy
> + *
> + * Called to create a phy using phy framework.
> + */
> +struct phy *create_phy(struct device *dev, struct phy_descriptor *desc)

All other functions are named phy_*, please rename this, too.

> +{
> +	int ret;
> +	struct phy *phy;
> +	struct phy_bind *phy_bind;
> +	const char *devname = NULL;
> +
> +	if (!dev || !desc) {
> +		dev_err(dev, "no descriptor/device provided for PHY\n");
> +		ret = -EINVAL;
> +		goto err0;
> +	}
> +
> +	if (!desc->ops) {
> +		dev_err(dev, "no PHY ops provided\n");
> +		ret = -EINVAL;
> +		goto err0;
> +	}
> +
> +	phy = kzalloc(sizeof(*phy), GFP_KERNEL);
> +	if (!phy) {
> +		dev_err(dev, "no memory for PHY\n");
> +		ret = -ENOMEM;
> +		goto err0;
> +	}
> +
> +	devname = dev_name(dev);
> +	device_initialize(&phy->dev);
> +	phy->desc = desc;
> +	phy->dev.class = phy_class;
> +	phy->dev.parent = dev;
> +	ret = dev_set_name(&phy->dev, "%s", devname);
> +	if (ret)
> +		goto err1;
> +
> +	mutex_lock(&phy_list_mutex);
> +	list_for_each_entry(phy_bind, &phy_bind_list, list)
> +		if (!(strcmp(phy_bind->phy_dev_name, devname)))
> +			phy_bind->phy = phy;
> +
> +	list_add_tail(&phy->head, &phy_list);
> +
> +	ret = device_add(&phy->dev);
> +	if (ret)
> +		goto err2;
> +
> +	mutex_unlock(&phy_list_mutex);
> +
> +	return phy;
> +
> +err2:
> +	phy_bind->phy = NULL;
> +	list_del(&phy->head);
> +	mutex_unlock(&phy_list_mutex);
> +
> +err1:
> +	put_device(&phy->dev);
> +	kfree(phy);
> +
> +err0:
> +	return ERR_PTR(ret);
> +}
> +EXPORT_SYMBOL_GPL(create_phy);
> +
> +/**
> + * destroy_phy - destroy the phy
> + * @phy: the phy to be destroyed
> + *
> + * Called to destroy the phy.
> + */
> +void destroy_phy(struct phy *phy)
> +{
> +	struct phy_bind *phy_bind;
> +
> +	mutex_lock(&phy_list_mutex);
> +	list_for_each_entry(phy_bind, &phy_bind_list, list) {
> +		if (phy_bind->phy == phy)
> +			phy_bind->phy = NULL;
> +
> +		if (phy_bind->auto_bind) {
> +			list_del(&phy_bind->list);
> +			kfree(phy_bind);
> +		}
> +	}
> +
> +	list_del(&phy->head);
> +	mutex_unlock(&phy_list_mutex);
> +
> +	device_unregister(&phy->dev);
> +}
> +EXPORT_SYMBOL_GPL(destroy_phy);
> +
> +/**
> + * phy_bind - 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 phy_bind *phy_bind(const char *dev_name, u8 index,
> +				const char *phy_dev_name)
> +{
> +	struct phy_bind *phy_bind;
> +
> +	phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL);
> +	if (!phy_bind) {
> +		pr_err("phy_bind(): No memory for phy_bind");
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	phy_bind->dev_name = dev_name;
> +	phy_bind->phy_dev_name = phy_dev_name;
> +	phy_bind->index = index;
> +	phy_bind->auto_bind = false;
> +
> +	list_add_tail(&phy_bind->list, &phy_bind_list);
> +
> +	return phy_bind;
> +}
> +EXPORT_SYMBOL_GPL(phy_bind);
> +
> +static ssize_t phy_name_show(struct device *dev,
> +			     struct device_attribute *attr, char *buf)
> +{
> +	struct phy *phy;
> +
> +	phy = container_of(dev, struct phy, dev);
> +
> +	return sprintf(buf, "%s\n", phy->desc->label);
> +}
> +
> +static ssize_t phy_bind_show(struct device *dev,
> +			     struct device_attribute *attr, char *buf)
> +{
> +	struct phy_bind *phy_bind;
> +	struct phy *phy;
> +	char *p = buf;
> +	int len;
> +
> +	phy = container_of(dev, struct phy, dev);
> +
> +	list_for_each_entry(phy_bind, &phy_bind_list, list)
> +		if (phy_bind->phy == phy)
> +			p += sprintf(p, "%s %d\n", phy_bind->dev_name,
> +							phy_bind->index);
> +	len = (p - buf);
> +
> +	return len;
> +}
> +
> +static struct device_attribute phy_dev_attrs[] = {
> +	__ATTR(label, 0444, phy_name_show, NULL),
> +	__ATTR(bind, 0444, phy_bind_show, NULL),
> +	__ATTR_NULL,
> +};
> +
> +/**
> + * phy_release - release the phy
> + * @dev: the dev member within phy
> + *
> + * when the last reference to the device is removed; it is called
> + * from the embedded kobject as release method.
> + */
> +static void phy_release(struct device *dev)
> +{
> +	struct phy *phy;
> +
> +	phy = container_of(dev, struct phy, dev);
> +	dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
> +	kfree(phy);
> +}
> +
> +static int __init phy_core_init(void)
> +{
> +	phy_class = class_create(THIS_MODULE, "phy");
> +	if (IS_ERR(phy_class)) {
> +		pr_err("failed to create phy class --> %ld\n",
> +			PTR_ERR(phy_class));
> +		return PTR_ERR(phy_class);
> +	}
> +
> +	phy_class->dev_release = phy_release;
> +	phy_class->dev_attrs = phy_dev_attrs;
> +
> +	return 0;
> +}
> +subsys_initcall(phy_core_init);
> +
> +static void __exit phy_core_exit(void)
> +{
> +	class_destroy(phy_class);
> +}
> +module_exit(phy_core_exit);
> +
> +MODULE_DESCRIPTION("Generic Phy Framework");
> +MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@...com>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> new file mode 100644
> index 0000000..831c1c0
> --- /dev/null
> +++ b/include/linux/phy/phy.h
> @@ -0,0 +1,181 @@
> +/*
> + * phy.h -- generic phy header file
> + *
> + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * Author: Kishon Vijay Abraham I <kishon@...com>
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#ifndef __DRIVERS_PHY_H
> +#define __DRIVERS_PHY_H
> +
> +struct phy;
> +
> +/**
> + * struct phy_descriptor - structure that describes the PHY
> + * @label: label given to phy
> + * @type: specifies the phy type
> + * @of_node: device node of the phy
> + * @ops: function pointers for performing phy operations
> + */
> +struct phy_descriptor {
> +	const char		*label;
> +	int			type;
> +	struct device_node	*of_node;
> +	struct phy_ops		*ops;
> +};
> +
> +/**
> + * struct phy_ops - set of function pointers for performing phy operations
> + * @init: operation to be performed for initializing phy
> + * @exit: operation to be performed while exiting
> + * @suspend: suspending the phy
> + * @resume: resuming the phy
> + * @poweron: powering on the phy
> + * @shutdown: shutting down the phy
> + */
> +struct phy_ops {
> +	int	(*init)(struct phy_descriptor *desc);
> +	int	(*exit)(struct phy_descriptor *desc);
> +	int	(*suspend)(struct phy_descriptor *desc);
> +	int	(*resume)(struct phy_descriptor *desc);
> +	int	(*poweron)(struct phy_descriptor *desc);
> +	int	(*shutdown)(struct phy_descriptor *desc);
> +};
> +
> +/**
> + * struct phy - represent the phy device
> + * @desc: descriptor for the phy
> + * @head: to support multiple transceivers
> + */
> +struct phy {
> +	struct device		dev;
> +	struct phy_descriptor	*desc;
> +	struct list_head	head;
> +};
> +
> +/**
> + * struct 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
> + * @auto_bind: tells if the binding is done explicitly from board file or not
> + * @phy: reference to the phy
> + * @list: to maintain a linked list of the binding information
> + */
> +struct phy_bind {
> +	const char	*dev_name;
> +	const char	*phy_dev_name;
> +	u8		index;
> +	int		auto_bind:1;
> +	struct phy	*phy;
> +	struct list_head list;
> +};
> +
> +#if defined(CONFIG_GENERIC_PHY) || defined(CONFIG_GENERIC_PHY_MODULE)
> +extern struct phy *devm_phy_get(struct device *dev, u8 index);
> +extern void devm_phy_put(struct device *dev, struct phy *phy);
> +extern struct phy *devm_of_phy_get(struct device *dev, const char *phandle);
> +extern struct phy *phy_get(struct device *dev, u8 index);
> +extern void phy_put(struct phy *phy);
> +extern struct phy *create_phy(struct device *dev, struct phy_descriptor *desc);
> +extern void destroy_phy(struct phy *phy);
> +extern struct phy_bind *phy_bind(const char *dev_name, u8 index,
> +				const char *phy_dev_name);
> +#else
> +static inline struct phy *devm_phy_get(struct device *dev, u8 index)
> +{
> +	return ERR_PTR(-EINVAL);
> +}
> +
> +static inline void devm_phy_put(struct device *dev, struct phy *phy)
> +{
> +}
> +
> +static inline struct phy *devm_of_phy_get(struct device *dev,
> +		const char *phandle)
> +{
> +	return ERR_PTR(-EINVAL);
> +}
> +
> +static inline struct phy *phy_get(struct device *dev, u8 index)
> +{
> +	return ERR_PTR(-EINVAL);
> +}
> +
> +static inline void phy_put(struct phy *phy)
> +{
> +}
> +
> +static inline struct phy *create_phy(struct device *dev,
> +	struct phy_descriptor *desc)
> +{
> +	return ERR_PTR(-EINVAL);
> +}
> +
> +static inline void destroy_phy(struct phy *phy)
> +{
> +}
> +
> +static inline struct phy_bind *phy_bind(const char *dev_name, u8 index,
> +				const char *phy_dev_name)
> +{
> +}
> +#endif
> +
> +static inline int phy_init(struct phy *phy)
> +{
> +	if (phy->desc->ops->init)
> +		return phy->desc->ops->init(phy->desc);
> +
> +	return -EINVAL;
> +}
> +
> +static inline int phy_exit(struct phy *phy)
> +{
> +	if (phy->desc->ops->exit)
> +		return phy->desc->ops->exit(phy->desc);
> +
> +	return -EINVAL;
> +}
> +
> +static inline int phy_suspend(struct phy *phy)
> +{
> +	if (phy->desc->ops->suspend)
> +		return phy->desc->ops->suspend(phy->desc);
> +
> +	return -EINVAL;
> +}
> +
> +static inline int phy_resume(struct phy *phy)
> +{
> +	if (phy->desc->ops->resume)
> +		return phy->desc->ops->resume(phy->desc);
> +
> +	return -EINVAL;
> +}
> +
> +static inline int phy_poweron(struct phy *phy)
> +{
> +	if (phy->desc->ops->poweron)
> +		return phy->desc->ops->poweron(phy->desc);
> +
> +	return -EINVAL;
> +}
> +
> +static inline void phy_shutdown(struct phy *phy)
> +{
> +	if (phy->desc->ops->shutdown)
> +		phy->desc->ops->shutdown(phy->desc);
> +}
> +#endif /* __DRIVERS_PHY_H */
> 


-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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