linux-kernel - Re: platform_driver

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Message-ID: <8d6898730707030558o5e110b0v257ffc6350c76069@mail.gmail.com>
Date:	Tue, 3 Jul 2007 18:28:40 +0530
From:	"Nobin Mathew" <nobin.mathew@...il.com>
To:	"Midhun Agnihotram" <agnimidhun@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"Pierre Ossman" <drzeus-mmc@...eus.cx>
Subject: Re: platform_driver_register() ??

Hi Midhun,
    I think mmc driver is layered modules, only top block driver
registers driver under  "mmc_bus_type" bus, see
drivers/mmc/mmc_sysfs.c and mmc_block.c. I think they are creating a
tree of devices of same characteristics under that bus.
I think your driver is linux/drivers/mmc/imxmmc.c where it registers a
driver for device of type "platform_bus_type". This module will come
under above mentioned block driver.
Corresponding platform device is registered in
linux/arch/arm/mach-imx/generic.c see platform_device imx_mmc_device.

Nobin Mathew




On 7/3/07, Midhun Agnihotram <agnimidhun@...il.com> wrote:
> Hi All,
>
>  I have an MMC driver for my kit (i.MX21 based cogent board
> CSB535FS), which is supplied by Cogent (Kernel version 2.6.16).
>
>   The original driver (linux/drivers/mmc/mmc_block.c) uses
> mmc_register_driver() method to register the driver but the one
> supplied by Cogent uses platform_driver_register() method. What is the
> difference between the two?
>
>
> Thanks,
> Midhun.
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