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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <552D2255.1050704@ti.com>
Date:	Tue, 14 Apr 2015 19:51:09 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	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>,
	Arun Ramamurthy <arun.ramamurthy@...adcom.com>,
	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

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

Thanks
Kishon
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/