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

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Message-ID: <20140509085941.GM5767@lee--X1>
Date:	Fri, 9 May 2014 09:59:41 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Cc:	Hans de Goede <hdegoede@...hat.com>,
	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

> >>>>>>> +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 ?

It is.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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