From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans de Goede Subject: Re: [PATCH v2 3/7] mfd: add support for sun6i PRCM (Power/Reset/Clock Management) unit Date: Fri, 09 May 2014 10:18:57 +0200 Message-ID: <536C8F71.5040604@redhat.com> References: <1399483554-8824-1-git-send-email-boris.brezillon@free-electrons.com> <1399483554-8824-4-git-send-email-boris.brezillon@free-electrons.com> <20140508110205.GB5767@lee--X1> <536BE366.8080907@free-electrons.com> <20140509071246.GE5767@lee--X1> <536C84F6.2050701@redhat.com> <20140509080807.GH5767@lee--X1> Reply-To: linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Return-path: In-Reply-To: <20140509080807.GH5767@lee--X1> List-Post: , List-Help: , List-Archive: Sender: linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org List-Subscribe: , List-Unsubscribe: , To: Lee Jones Cc: Boris BREZILLON , =?UTF-8?B?RW1pbA==?= =?UTF-8?B?aW8gTMOzcGV6?= , Mike Turquette , Samuel Ortiz , Chen-Yu Tsai , Maxime Ripard , Philipp Zabel , Shuge , kevin-0TFLnhJekD6UEPyfVivIlAC/G2K4zDHf@public.gmane.org, Randy Dunlap , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, dev-3kdeTeqwOZ9EV1b7eY7vFQ@public.gmane.org List-Id: devicetree@vger.kernel.org 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. Regards, Hans