linux-kernel - Re: [PATCHv2 1/3] phy: core: Add devm_of_phy_get_by

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Message-ID: <20150416070822.GA4682@shlinux1.ap.freescale.net>
Date:	Thu, 16 Apr 2015 15:08:23 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>
CC:	Kishon Vijay Abraham I <kishon@...com>,
	Tony Prisk <linux@...sktech.co.nz>,
	Alan Stern <stern@...land.harvard.edu>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>, Felipe Balbi <balbi@...com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Paul Bolle <pebolle@...cali.nl>,
	Thomas Pugliese <thomas.pugliese@...il.com>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	David Mosberger <davidm@...uge.net>,
	Peter Griffin <peter.griffin@...aro.org>,
	"Gregory CLEMENT" <gregory.clement@...e-electrons.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Kevin Hao <haokexin@...il.com>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, Dmitry Torokhov <dtor@...gle.com>,
	"Anatol Pomazau" <anatol@...gle.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	<bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCHv2 1/3] phy: core: Add devm_of_phy_get_by_index to
 phy-core

On Mon, Apr 13, 2015 at 03:10:45PM -0700, Arun Ramamurthy wrote:
> Some generic drivers, such as ehci, may use multiple phys and for such
> drivers referencing phy(s) by name(s) does not make sense. Instead of
> inventing new naming schemes and using custom code to iterate through them,
> such drivers are better of using nameless phy bindings and using this newly
> introduced API to iterate through them.
> 
> Signed-off-by: Arun Ramamurthy <arun.ramamurthy@...adcom.com>
> Reviewed-by: Ray Jui <rjui@...adcom.com>
> Reviewed-by: Scott Branden <sbranden@...adcom.com>
> ---
>  drivers/phy/phy-core.c  | 32 ++++++++++++++++++++++++++++++++
>  include/linux/phy/phy.h |  2 ++
>  2 files changed, 34 insertions(+)
> 
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index 3791838..964a84d 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -623,6 +623,38 @@ struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
>  EXPORT_SYMBOL_GPL(devm_of_phy_get);
>  
>  /**
> + * devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index.
> + * @dev: device that requests this phy
> + * @np: node containing the phy
> + * @index: index of the phy
> + *
> + * Gets the phy using _of_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_of_phy_get_by_index(struct device *dev, struct device_node *np,
> +				     int index)
> +{
> +	struct phy **ptr, *phy;
> +
> +	ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
> +	if (!ptr)
> +		return ERR_PTR(-ENOMEM);
> +
> +	phy = _of_phy_get(np, index);
> +	if (!IS_ERR(phy)) {
> +		*ptr = phy;
> +		devres_add(dev, ptr);
> +	} else {
> +		devres_free(ptr);
> +	}
> +
> +	return phy;
> +}
> +EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
> +
> +/**
>   * phy_create() - create a new phy
>   * @dev: device that is creating the new phy
>   * @node: device node of the phy
> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> index a0197fa..ae2ffaf 100644
> --- a/include/linux/phy/phy.h
> +++ b/include/linux/phy/phy.h
> @@ -133,6 +133,8 @@ struct phy *devm_phy_get(struct device *dev, const char *string);
>  struct phy *devm_phy_optional_get(struct device *dev, const char *string);
>  struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
>  			    const char *con_id);
> +struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
> +				     int index);

You may need to add an implementation if CONFIG_GENERIC_PHY is not enabled.

>  void phy_put(struct phy *phy);
>  void devm_phy_put(struct device *dev, struct phy *phy);
>  struct phy *of_phy_get(struct device_node *np, const char *con_id);


> -- 
> 2.3.4
> 
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-- 

Best Regards,
Peter Chen
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