On Wed, Feb 01, 2012 at 04:29:25PM +0100, Frederic LAMBERT wrote: > > > To sumarize, I have a same code that works for the 3 architecture, the > > > single difference being in the device name: > > > /sys/proc/spi/drivers/at25/spi0.0/eeprom for Nios2 > > > dataBase.dat on Linux > > > /dev/sdb on the Virtual Machine
> > In this case surely the mechanisms used to identify regular disks (UUIDs > > and so on) will also work (the .dat file will have to be an override, > > but otherwise...)? Names like sdb aren't stable either - they can > > change with either software or hardware changes since they just come > > from the order of discovery. > Sure there are mechanisms, but that means that the code must be either > specific to the arch, either have the code for all of them. Not simple ! Well, something that walks all block devices on Linux is very straightforward... It sounds like you just want logic along the lines of "find a block device and offer the option of overriding by providing a specific path for use with a file", is that about right? > The other issue with your patch is that setting a bus number is > > obviously not a device specific thing, it's something that will apply to > > any SPI controller on Linux, and so shouldn't be something driver > > specific but should instead be a change to the SPI core. > Although I tend to agree you on the fact that SPI bus num is a SPI core > matter, but the fact is that, for now, it is the controller that must fill > the spi_master structure to call spi_master_get(), and that this structure > contains a field 'bus_num' that is always initialized to -1 since DTS... This sounds like a simple matter of proramming to change. Clearly providing a standard feature of the SPI subsystem will involve modification of the SPI core, for example to change the interpretation of -1 to go look at the device tree and override it. ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
