On Wed, 19 May 2010 15:27:35 +0300 Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx> wrote: > > The sysfs set interface implies userspace having knowledge of driver > > capabilities and configuration in order to safely toggle between the two > > DMA modes. Imo, the mcbsp client driver should be the only entity > > configuring it's DMA modes (in a safe manner) depending on the use case. > > Furthermore, if there is a need for 'Use Cases', than the machine driver can > provide user control to switch between them. > The thing is that in most cases these are trivial, and mostly the same settings, > but if you throw a codec like the tlv320dac33 into the mix, which has it's own > FIFO, than things gets complicated. > The user (the real one, not the developer) has several settings scattered all > around the place, and those has to be configured in harmony. > The only place is to do this, is in the machine driver, whihc than can build up > 'scenarios', and configure the things in synchronized manner. > Yes and I think only very few developers know what to do with those op mode and threshold sysfs controls so most probably they are unused. Then machine drivers setting them automatically/with some control could give us more testing base. But as those sysfs controls are there we must preserve them for a release cycle or two in case if someone is using them. At least Linus or Andrew may complain about removal of them. -- Jarkko -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
