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

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Date:	Wed, 25 Mar 2015 17:04:32 -0700
From:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>
To:	Kishon Vijay Abraham I <kishon@...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



On 15-03-25 03:03 PM, Kishon Vijay Abraham I wrote:
> 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.
Thanks Kison. Can you be more specific? I am unsure of what more I can 
explain 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.
>
Ok will do.
> -Kishon
>
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