linux-kernel - Re: [PATCH v2 3/7] mfd: add support for sun6i PRCM (Power/Reset/Clock Management) unit

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Message-ID: <536C91A6.6000500@free-electrons.com>
Date:	Fri, 09 May 2014 10:28:22 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Hans de Goede <hdegoede@...hat.com>,
	Lee Jones <lee.jones@...aro.org>
CC:	Emilio López <emilio@...pez.com.ar>,
	Mike Turquette <mturquette@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Shuge <shuge@...winnertech.com>, kevin@...winnertech.com,
	Randy Dunlap <rdunlap@...radead.org>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dev@...ux-sunxi.org
Subject: Re: [PATCH v2 3/7] mfd: add support for sun6i PRCM (Power/Reset/Clock
 Management) unit


On 09/05/2014 10:18, Hans de Goede wrote:
> Hi,
>
> On 05/09/2014 10:08 AM, Lee Jones wrote:
>>>>>>> +static struct platform_driver sun6i_prcm_driver = {
>>>>>>> +	.driver = {
>>>>>>> +		.name = "sun6i-prcm",
>>>>>>> +		.owner = THIS_MODULE,
>>>>>>> +		.of_match_table = sun6i_prcm_dt_ids,
>>>>>>> +	},
>>>>>>> +	.probe = sun6i_prcm_probe,
>>>>>> You need a .remove() call-back.
>>>>> This driver cannot be compiled as module (see the Kconfig definition)
>>>>> and the devices are not hotpluggable, as a result a probed device will
>>>>> never be removed.
>>>>>
>>>>> Do you still want me to implement the remove function ?
>>>> .remove() also be run on shut down.
>>> That is not true, if your device needs to do anything special at shutdown
>>> you need to add a shutdown callback. Devices are kept as is (not torn down)
>>> on shutdown.
>> Ah okay, I'll bow to your knowledge.  So there's no reason for this
>> driver to ever call mfd_remove_devices() then?
> No, this is an integral part of the SOC, which never gets removed in any way.

Lee, I'm about to send a 3rd version of this series, is it okay for you
if I leave the remove function unimplemented ?

>
> Regards,
>
> Hans

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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