linux-kernel - Re: platform_driver

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Message-ID: <4dde4acb0707050221k5a73a4abt2db9e8b0f7c74ae1@mail.gmail.com>
Date:	Thu, 5 Jul 2007 14:51:35 +0530
From:	"Midhun Agnihotram" <agnimidhun@...il.com>
To:	"Pierre Ossman" <drzeus-mmc@...eus.cx>
Cc:	"Nobin Mathew" <nobin.mathew@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: platform_driver_register() ??

Hi All,


> >     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.


    Is it necessary that the firmware (may be bootloader) notify about
the MMC host to Linux? The kernel documentation (platform.txt) says :

 "The firmware should notify the platform bus about devices before the
legacy drivers have had a chance to load."

   Have I interpreted the above sentence correctly?

Thanks,
Midhun.
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