linux-kernel - Re: [PATCHv2 2/3] usb: ehci-platform: Use devm_of_phy_get_by

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Date:	Tue, 14 Apr 2015 11:05:35 -0700
From:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>
To:	Kishon Vijay Abraham I <kishon@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	<bcm-kernel-feedback-list@...adcom.com>,
	Thomas Pugliese <thomas.pugliese@...il.com>,
	Peter Griffin <peter.griffin@...aro.org>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Anatol Pomazau <anatol@...gle.com>,
	Ray Jui <rjui@...adcom.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Dmitry Torokhov <dtor@...gle.com>,
	"David Mosberger" <davidm@...uge.net>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Kevin Hao <haokexin@...il.com>,
	"Paul Bolle" <pebolle@...cali.nl>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Scott Branden <sbranden@...adcom.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Felipe Balbi <balbi@...com>, Tony Prisk <linux@...sktech.co.nz>
Subject: Re: [PATCHv2 2/3] usb: ehci-platform: Use devm_of_phy_get_by_index



On 15-04-14 07:21 AM, Kishon Vijay Abraham I wrote:
> Hi,
>
> On Tuesday 14 April 2015 06:57 PM, Greg Kroah-Hartman wrote:
>> On Tue, Apr 14, 2015 at 03:17:30PM +0200, Arnd Bergmann wrote:
>>> On Tuesday 14 April 2015 14:37:37 Greg Kroah-Hartman wrote:
>>>> On Tue, Apr 14, 2015 at 01:33:08PM +0200, Arnd Bergmann wrote:
>>>>> This is true, but all other drivers do the same for GENERIC_PHY at the
>>>>> moment. If this one gets changed, we should probably apply the same
>>>>> solution to all current users and fix them consistently.
>>>>>
>>>>> We can do one of these two:
>>>>>
>>>>> a) make sure that the framework has 'static inline' stubs that let you
>>>>>     build all drivers using it when the framework itself is disabled.
>>>>
>>>> Yes, please do that.
>>>>
>>>>> b) change the drivers using it to 'depends on', and make GENERIC_PHY
>>>>>     itself a hidden option without a Kconfig prompt.
>>>>
>>>> Then how could GENERIC_PHY ever get set?
>>>
>>> Right now, every driver that provides a phy uses 'select GENERIC_PHY',
>>> and they would have to keep doing that. This is not unlike what we
>>> do for other silent symbols like MFD_CORE, REGMAP_I2C, or PINCTRL,
>>> and it's not as problematic as 'select' on a user-visible option,
>>> or (worst) mixing 'select' and 'depends on'.
>>
>> Ok, that would make more sense, but it would be good for the PHY
>> maintainer to agree to it as well :)
>
> looking at [1], we should use select only for non-visible symbols and
> for symbols with no dependencies. As such GENERIC_PHY is not dependent
> on other symbols but for now it is "visible".
>
> phy-core has all the stubs already implemented in
> include/linux/phy/phy.h. So removing select GENERIC_PHY shouldn't be a
> problem. But then it might break a few platforms where GENERIC_PHY is
> indirectly enabled by selecting the config of the driver (using default
> defconfigs in arch/arm/configs).
>
> The simplest thing would be to make GENERIC_PHY an invisible option?
>
> [1] ->
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/kbuild/kconfig-language.txt#n111
>
Kishon,removing select GENERIC_PHY also breaks the builds for certain 
architectures (i386 and x84_64). Is the consensus to leave the select 
but make GENERIC_PHY a invisible option? Thanks
>
> Thanks
> Kishon
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