On 5 January 2015 at 20:05, Simon Glass <s...@chromium.org> wrote: > So far driver model's GPIO uclass just implements the existing GPIO API. > This has some limitations: > > - it requires manual device tree munging to support GPIOs in device tree > (fdtdec_get_gpio() and friends) > - it does not understand polarity > - it is somewhat slower since we must scan for the GPIO device each time > - Global GPIO numbering can change if other GPIO drivers are probed > - it requires extra steps to set the GPIO direction and value > > The new functions have a dm_ prefix where necessary to avoid name conflicts > but we can remove that when it is no-longer needed. The new struct gpio_desc > holds all required information about the GPIO. For now this is intended to > be stored by the client requesting the GPIO, but in future it might be > brought into the uclass in some way. > > With these changes the old GPIO API still works, and uses the driver model > API underneath. > > Signed-off-by: Simon Glass <s...@chromium.org> > --- > > drivers/gpio/gpio-uclass.c | 218 > ++++++++++++++++++++++++++++++--------------- > include/asm-generic/gpio.h | 16 ++++ > 2 files changed, 163 insertions(+), 71 deletions(-)
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