Re: platform_driver_register() ??
On Thu, 5 Jul 2007 14:51:35 +0530 "Midhun Agnihotram" <[EMAIL PROTECTED]> wrote: > > 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? > I don't know what the meaning of that sentence was supposed to be, but platform devices are everything the kernel cannot probe in a "normal" way. Usually this covers devices that cannot be probed at all, but must be listed some other way (i.e. manually). Commonly the arch and machine specific code adds the devices. The machine code is usually specific to a certain hardware, so the code "knows" which devices are present, even though it can't probe them. So to answer your question; no, the firmware doesn't have to tell Linux about the devices. Rgds -- -- Pierre Ossman Linux kernel, MMC maintainerhttp://www.kernel.org PulseAudio, core developer http://pulseaudio.org rdesktop, core developer http://www.rdesktop.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: platform_driver_register() ??
On Tue, 3 Jul 2007 18:28:40 +0530 "Nobin Mathew" <[EMAIL PROTECTED]> wrote: > 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. > Indeed. You seem to have the hang of this ;) Rgds -- -- Pierre Ossman Linux kernel, MMC maintainerhttp://www.kernel.org PulseAudio, core developer http://pulseaudio.org rdesktop, core developer http://www.rdesktop.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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 <[EMAIL PROTECTED]> 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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
