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

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Message-ID: <55355F5B.6060504@broadcom.com>
Date:	Mon, 20 Apr 2015 13:19:39 -0700
From:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>
To:	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>
CC:	<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 15-04-15 02:59 AM, Kishon Vijay Abraham I wrote:
> Hi,
>
> On Tuesday 14 April 2015 03:40 AM, 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);
>
> Add stubs for this function too. Also update the Documentation/phy.txt.
>
Kishon, I have added stubs for this function in my next patch set. 
However I am still unclear on whether I need to make GENERIC_PHY an 
invisible option or change my "select" to "depend" ? It seems like there 
was no consensus on this? Do you have any final thoughts before i send 
out the next patch set? Thanks

> Thanks
> Kishon
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