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

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Date:	Fri, 09 May 2014 09:34:14 +0200
From:	Hans de Goede <hdegoede@...hat.com>
To:	Lee Jones <lee.jones@...aro.org>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>
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

Hi,

On 05/09/2014 09:12 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.

> It's best practice to have one.
> 
>>>> +module_platform_driver(sun6i_prcm_driver);
>>>> +
>>>> +MODULE_AUTHOR("Boris BREZILLON <boris.brezillon@...e-electrons.com>");
>>>> +MODULE_DESCRIPTION("Allwinner sun6i PRCM driver");
>>>> +MODULE_LICENSE("GPL v2");
>>
> 

Regards,

Hans
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