On Thu, Feb 04, 2021 at 09:22:09PM -0700, Simon Glass wrote:
Using the internal vs. external pull resistors it is possible to get 27 different combinations from 3 strapping pins. Add an implementation of this.
This involves updating the sandbox GPIO driver to model external and (weaker) internal pull resistors. The get_value() method now takes account of what is driving a pin:
sandbox: GPIOD_EXT_DRIVEN - in which case GPIO_EXT_HIGH provides the value outside source - in which case GPIO_EXT_PULL_UP/DOWN indicates the external state and we work the final state using those flags and the internal GPIOD_PULL_UP/DOWN flags
Of course the outside source does not really exist in sandbox. We are just modelling it for test purpose.
Signed-off-by: Simon Glass sjg@chromium.org
Applied to u-boot/next, thanks!