Re: Handling of modular boards
|[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
On Fri, May 04, 2012 at 11:55:14PM +0100, Russell King - ARM Linux wrote: > On Fri, May 04, 2012 at 07:58:51PM +0100, Mark Brown wrote: > > I'm just starting to put some stuff together for this so I was wondering > > if anyone had been thinking about this and had any bright ideas for how > > to handle it, and also if people think that MFD is a good fit for this > > or if we should split the silicon MFDs from these PCBs. > I don't think its true to say that there's no support for this kind of > thing. > If you're thinking about a motherboard with separate add-on cards, then > you can view the cards as their own separate platform device. Your > platform device driver would be a "whole board driver" responsible > for creating and registering the specific devices found on the board > in its probe function, and unregistering them in the remove function. Oh, absolutely - there's support there at that level and several boards doing some or all of this in mainline already. It's not that you can't do it, it's that there's a bunch of generic stuff to do with how you map the resources through to the devices on the modules and describe the chips that are on the modules for which there's no infrastructure so everything needs to be hand coded on a per board basis. The board identification bits are board specific but the remapping and subdevice instantiation bits seem like they shouldn't be. > It also helps to give the right model to the power management support, > because you're automatically arranging the child devices below the > board-level device, which means all the child devices should be > suspended before the board level device, and the board level device > should be resumed before the child devices. Yes, I'd anticipate that we'd have a device for the board which should help with this sort of stuff.
Description: Digital signature
[Other Archives] [Linux Kernel Newbies] [Linux Driver Development] [Fedora Kernel] [Linux Kernel Testers] [Linux SH] [Linux Omap] [Linux Kbuild] [Linux Tape] [Linux Input] [Linux Kernel Janitors] [Linux Kernel Packagers] [Linux Doc] [Linux Man Pages] [Linux API] [Linux Memory Management] [Linux Modules] [Linux Standards] [Kernel Announce] [Netdev] [Git] [Linux PCI] Linux CAN Development [Linux I2C] [Linux RDMA] [Linux NUMA] [Netfilter] [Netfilter Devel] [SELinux] [Bugtraq] [FIO] [Linux Perf Users] [Linux Serial] [Linux PPP] [Linux ISDN] [Linux Next] [Kernel Stable Commits] [Linux Tip Commits] [Kernel MM Commits] [Linux Security Module] [AutoFS] [Filesystem Development] [Ext3 Filesystem] [Linux bcache] [Ext4 Filesystem] [Linux BTRFS] [Linux CEPH Filesystem] [Linux XFS] [XFS] [Linux NFS] [Linux CIFS] [Ecryptfs] [Linux NILFS] [Linux Cachefs] [Reiser FS] [Initramfs] [Linux FB Devel] [Linux OpenGL] [DRI Devel] [Fastboot] [Linux RT Users] [Linux RT Stable] [eCos] [Corosync] [Linux Clusters] [LVS Devel] [Hot Plug] [Linux Virtualization] [KVM] [KVM PPC] [KVM ia64] [Linux Containers] [Linux Hexagon] [Linux Cgroups] [Util Linux] [Wireless] [Linux Bluetooth] [Bluez Devel] [Ethernet Bridging] [Embedded Linux] [Barebox] [Linux MMC] [Linux IIO] [Sparse] [Smatch] [Linux Arch] [x86 Platform Driver] [Linux ACPI] [Linux IBM ACPI] [LM Sensors] [CPU Freq] [Linux Power Management] [Linmodems] [Linux DCCP] [Linux SCTP] [ALSA Devel] [Linux USB] [Linux PA RISC] [Linux Samsung SOC] [MIPS Linux] [IBM S/390 Linux] [ARM Linux] [ARM Kernel] [ARM MSM] [Tegra Devel] [Sparc Linux] [Linux Security] [Linux Sound] [Linux Media] [Video 4 Linux] [Linux IRDA Users] [Linux for the blind] [Linux RAID] [Linux ATA RAID] [Device Mapper] [Linux SCSI] [SCSI Target Devel] [Linux SCSI Target Infrastructure] [Linux IDE] [Linux SMP] [Linux AXP] [Linux Alpha] [Linux M68K] [Linux ia64] [Linux 8086] [Linux x86_64] [Linux Config] [Linux Apps] [Linux MSDOS] [Linux X.25] [Linux Crypto] [DM Crypt] [Linux Trace Users] [Linux Btrace] [Linux Watchdog] [Utrace Devel] [Linux C Programming] [Linux Assembly] [Dash] [DWARVES] [Hail Devel] [Linux Kernel Debugger] [Linux gcc] [Gcc Help] [X.Org] [Wine]
[Older Kernel Discussion] [Yosemite National Park Forum] [Large Format Photos] [Gimp] [Yosemite Photos] [Stuff]