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278783 |
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14-Feb-2015 |
loos |
MFC r273917, r273926:
Fix the gpiobus locking by using a more sane model where it isn't necessary hold the gpiobus lock between the gpio calls.
gpiobus_acquire_lock() now accepts a third parameter which tells gpiobus what to do when the bus is already busy.
When GPIOBUS_WAIT wait is used, the calling thread will be put to sleep until the bus became free.
With GPIOBUS_DONTWAIT the calling thread will receive EWOULDBLOCK right away and then it can act upon.
This fixes the gpioiic(4) locking issues that arises when doing multiple concurrent access on the bus.
Fix the build of non-FDT systems by moving the gpiobusvar.h header outside the FDT #ifdef.
While here remove a few unused headers.
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