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

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Date:	Thu, 26 Mar 2015 03:33:33 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>,
	Dmitry Torokhov <dtor@...gle.com>
CC:	Tony Prisk <linux@...sktech.co.nz>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, 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: [PATCH 1/3] phy: core: Add devm_of_phy_get_by_index to phy-core

Hi,

On Saturday 21 March 2015 02:59 AM, Arun Ramamurthy wrote:
> 
> 
> On 15-03-20 02:26 PM, Dmitry Torokhov wrote:
>> Hi Arun,
>>
>> On Fri, Mar 20, 2015 at 02:07:08PM -0700, Arun Ramamurthy wrote:
>>> Adding devm_of_phy_get_by_index to get phys by supplying an index
>>> and not a phy name when multiple phys are declared

I think a bit more explanation on why get_by_index is needed here.
>>>
>>> Reviewed-by: Ray Jui <rjui@...adcom.com>
>>> Reviewed-by: Scott Branden <sbranden@...adcom.com>
>>> Signed-off-by: Arun Ramamurthy <arun.ramamurthy@...adcom.com>
>>> ---
>>>   drivers/phy/phy-core.c  | 30 ++++++++++++++++++++++++++++++
>>>   include/linux/phy/phy.h |  2 ++
>>>   2 files changed, 32 insertions(+)
>>>
>>> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
>>> index a12d353..0c03876 100644
>>> --- a/drivers/phy/phy-core.c
>>> +++ b/drivers/phy/phy-core.c
>>> @@ -622,6 +622,36 @@ 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;
>>> +}
>>
>> You want EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index); here.

Also update the Documentation/phy.txt.

-Kishon
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