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Date: Thu, 28 Apr 2016 20:04:58 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Thierry Reding <thierry.reding@...il.com>
CC: <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] phy: core: Allow children node to be overridden
On Thursday 28 April 2016 07:01 PM, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
>
> In order to more flexibly support device tree bindings, allow drivers to
> override the container of the child nodes. By default the device node of
> the PHY provider is assumed to be the parent for children, but bindings
> may decide to add additional levels for better organization.
>
> Cc: Kishon Vijay Abraham I <kishon@...com>
> Signed-off-by: Thierry Reding <treding@...dia.com>
Acked-by: Kishon Vijay Abraham I <kishon@...com>
> ---
> Hi Kishon,
>
> I'm looking for an Acked-by from you on this patch. It's recently become
> a requirement for the new Tegra PHY driver. As a precaution and to speed
> things up I preemptively took it into linux-next and I think it's pretty
> well-cooked by now. I have this sitting in a branch that I can stabilize
> and send your way as a pull request.
>
> Thanks,
> Thierry
>
> Changes in v2:
> - check that specified node is a child (or further descendant) of the
> PHY provider (Kishon)
>
> Documentation/phy.txt | 16 ++++++++++++++--
> drivers/phy/phy-core.c | 50 +++++++++++++++++++++++++++++++++++++++++++------
> include/linux/phy/phy.h | 31 ++++++++++++++++++++----------
> 3 files changed, 79 insertions(+), 18 deletions(-)
>
> diff --git a/Documentation/phy.txt b/Documentation/phy.txt
> index b388c5af9e72..0aa994bd9a91 100644
> --- a/Documentation/phy.txt
> +++ b/Documentation/phy.txt
> @@ -31,16 +31,28 @@ should provide its own implementation of of_xlate. of_xlate is used only for
> dt boot case.
>
> #define of_phy_provider_register(dev, xlate) \
> - __of_phy_provider_register((dev), THIS_MODULE, (xlate))
> + __of_phy_provider_register((dev), NULL, THIS_MODULE, (xlate))
>
> #define devm_of_phy_provider_register(dev, xlate) \
> - __devm_of_phy_provider_register((dev), THIS_MODULE, (xlate))
> + __devm_of_phy_provider_register((dev), NULL, THIS_MODULE, (xlate))
>
> of_phy_provider_register and devm_of_phy_provider_register macros can be used to
> register the phy_provider and it takes device and of_xlate as
> arguments. For the dt boot case, all PHY providers should use one of the above
> 2 macros to register the PHY provider.
>
> +Often the device tree nodes associated with a PHY provider will contain a set
> +of children that each represent a single PHY. Some bindings may nest the child
> +nodes within extra levels for context and extensibility, in which case the low
> +level of_phy_provider_register_full() and devm_of_phy_provider_register_full()
> +macros can be used to override the node containing the children.
> +
> +#define of_phy_provider_register_full(dev, children, xlate) \
> + __of_phy_provider_register(dev, children, THIS_MODULE, xlate)
> +
> +#define devm_of_phy_provider_register_full(dev, children, xlate) \
> + __devm_of_phy_provider_register_full(dev, children, THIS_MODULE, xlate)
> +
> void devm_of_phy_provider_unregister(struct device *dev,
> struct phy_provider *phy_provider);
> void of_phy_provider_unregister(struct phy_provider *phy_provider);
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index e7e574dc667a..b72e9a3b6429 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -141,7 +141,7 @@ static struct phy_provider *of_phy_provider_lookup(struct device_node *node)
> if (phy_provider->dev->of_node == node)
> return phy_provider;
>
> - for_each_child_of_node(phy_provider->dev->of_node, child)
> + for_each_child_of_node(phy_provider->children, child)
> if (child == node)
> return phy_provider;
> }
> @@ -811,24 +811,59 @@ EXPORT_SYMBOL_GPL(devm_phy_destroy);
> /**
> * __of_phy_provider_register() - create/register phy provider with the framework
> * @dev: struct device of the phy provider
> + * @children: device node containing children (if different from dev->of_node)
> * @owner: the module owner containing of_xlate
> * @of_xlate: function pointer to obtain phy instance from phy provider
> *
> * Creates struct phy_provider from dev and of_xlate function pointer.
> * This is used in the case of dt boot for finding the phy instance from
> * phy provider.
> + *
> + * If the PHY provider doesn't nest children directly but uses a separate
> + * child node to contain the individual children, the @children parameter
> + * can be used to override the default. If NULL, the default (dev->of_node)
> + * will be used. If non-NULL, the device node must be a child (or further
> + * descendant) of dev->of_node. Otherwise an ERR_PTR()-encoded -EINVAL
> + * error code is returned.
> */
> struct phy_provider *__of_phy_provider_register(struct device *dev,
> - struct module *owner, struct phy * (*of_xlate)(struct device *dev,
> - struct of_phandle_args *args))
> + struct device_node *children, struct module *owner,
> + struct phy * (*of_xlate)(struct device *dev,
> + struct of_phandle_args *args))
> {
> struct phy_provider *phy_provider;
>
> + /*
> + * If specified, the device node containing the children must itself
> + * be the provider's device node or a child (or further descendant)
> + * thereof.
> + */
> + if (children) {
> + struct device_node *parent = of_node_get(children), *next;
> +
> + while (parent) {
> + if (parent == dev->of_node)
> + break;
> +
> + next = of_get_parent(parent);
> + of_node_put(parent);
> + parent = next;
> + }
> +
> + if (!parent)
> + return ERR_PTR(-EINVAL);
> +
> + of_node_put(parent);
> + } else {
> + children = dev->of_node;
> + }
> +
> phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
> if (!phy_provider)
> return ERR_PTR(-ENOMEM);
>
> phy_provider->dev = dev;
> + phy_provider->children = of_node_get(children);
> phy_provider->owner = owner;
> phy_provider->of_xlate = of_xlate;
>
> @@ -854,8 +889,9 @@ EXPORT_SYMBOL_GPL(__of_phy_provider_register);
> * on the devres data, then, devres data is freed.
> */
> struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
> - struct module *owner, struct phy * (*of_xlate)(struct device *dev,
> - struct of_phandle_args *args))
> + struct device_node *children, struct module *owner,
> + struct phy * (*of_xlate)(struct device *dev,
> + struct of_phandle_args *args))
> {
> struct phy_provider **ptr, *phy_provider;
>
> @@ -863,7 +899,8 @@ struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
> if (!ptr)
> return ERR_PTR(-ENOMEM);
>
> - phy_provider = __of_phy_provider_register(dev, owner, of_xlate);
> + phy_provider = __of_phy_provider_register(dev, children, owner,
> + of_xlate);
> if (!IS_ERR(phy_provider)) {
> *ptr = phy_provider;
> devres_add(dev, ptr);
> @@ -888,6 +925,7 @@ void of_phy_provider_unregister(struct phy_provider *phy_provider)
>
> mutex_lock(&phy_provider_mutex);
> list_del(&phy_provider->list);
> + of_node_put(phy_provider->children);
> kfree(phy_provider);
> mutex_unlock(&phy_provider_mutex);
> }
> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> index 8cf05e341cff..a810f2a18842 100644
> --- a/include/linux/phy/phy.h
> +++ b/include/linux/phy/phy.h
> @@ -77,6 +77,7 @@ struct phy {
> */
> struct phy_provider {
> struct device *dev;
> + struct device_node *children;
> struct module *owner;
> struct list_head list;
> struct phy * (*of_xlate)(struct device *dev,
> @@ -93,10 +94,16 @@ struct phy_lookup {
> #define to_phy(a) (container_of((a), struct phy, dev))
>
> #define of_phy_provider_register(dev, xlate) \
> - __of_phy_provider_register((dev), THIS_MODULE, (xlate))
> + __of_phy_provider_register((dev), NULL, THIS_MODULE, (xlate))
>
> #define devm_of_phy_provider_register(dev, xlate) \
> - __devm_of_phy_provider_register((dev), THIS_MODULE, (xlate))
> + __devm_of_phy_provider_register((dev), NULL, THIS_MODULE, (xlate))
> +
> +#define of_phy_provider_register_full(dev, children, xlate) \
> + __of_phy_provider_register(dev, children, THIS_MODULE, xlate)
> +
> +#define devm_of_phy_provider_register_full(dev, children, xlate) \
> + __devm_of_phy_provider_register(dev, children, THIS_MODULE, xlate)
>
> static inline void phy_set_drvdata(struct phy *phy, void *data)
> {
> @@ -147,11 +154,13 @@ struct phy *devm_phy_create(struct device *dev, struct device_node *node,
> void phy_destroy(struct phy *phy);
> void devm_phy_destroy(struct device *dev, struct phy *phy);
> struct phy_provider *__of_phy_provider_register(struct device *dev,
> - struct module *owner, struct phy * (*of_xlate)(struct device *dev,
> - struct of_phandle_args *args));
> + struct device_node *children, struct module *owner,
> + struct phy * (*of_xlate)(struct device *dev,
> + struct of_phandle_args *args));
> struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
> - struct module *owner, struct phy * (*of_xlate)(struct device *dev,
> - struct of_phandle_args *args));
> + struct device_node *children, struct module *owner,
> + struct phy * (*of_xlate)(struct device *dev,
> + struct of_phandle_args *args));
> void of_phy_provider_unregister(struct phy_provider *phy_provider);
> void devm_of_phy_provider_unregister(struct device *dev,
> struct phy_provider *phy_provider);
> @@ -312,15 +321,17 @@ static inline void devm_phy_destroy(struct device *dev, struct phy *phy)
> }
>
> static inline struct phy_provider *__of_phy_provider_register(
> - struct device *dev, struct module *owner, struct phy * (*of_xlate)(
> - struct device *dev, struct of_phandle_args *args))
> + struct device *dev, struct device_node *children, struct module *owner,
> + struct phy * (*of_xlate)(struct device *dev,
> + struct of_phandle_args *args))
> {
> return ERR_PTR(-ENOSYS);
> }
>
> static inline struct phy_provider *__devm_of_phy_provider_register(struct device
> - *dev, struct module *owner, struct phy * (*of_xlate)(struct device *dev,
> - struct of_phandle_args *args))
> + *dev, struct device_node *children, struct module *owner,
> + struct phy * (*of_xlate)(struct device *dev,
> + struct of_phandle_args *args))
> {
> return ERR_PTR(-ENOSYS);
> }
>
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