On Mon, Jan 13, 2020 at 11:35:07AM +0100, Patrick Delaunay wrote:
This commit manages the new dir flags that can be used in gpio specifiers to indicate the pull-up or pull-down resistor configuration for output gpio (GPIO_PULL_UP, GPIO_PULL_DOWN) or the Open Drain/Open Source configuration for input gpio (GPIO_OPEN_DRAIN, GPIO_OPEN_SOURCE).
These flags are already supported in Linux kernel in gpio lib.
This patch only parse and save the direction flags in GPIO descriptor (desc->flags), it prepares the introduction of new ops to manage them. The GPIO uclass supports new GPIO flags from device-tree (GPIO_XXX define in include/dt-bindings/gpio/gpio.h) and translate them in the dir flags (GPIOD_XXX):
- GPIO_PULL_UP => GPIOD_PULL_UP
- GPIO_PULL_DOWN => GPIOD_PULL_DOWN
- GPIO_OPEN_DRAIN => GPIOD_OPEN_DRAIN
- GPIO_OPEN_SOURCE => GPIOD_OPEN_SOURCE
This patch also adds protection in the check_dir_flags function for new invalid configuration of the dir flags.
Signed-off-by: Patrick Delaunay patrick.delaunay@st.com Reviewed-by: Simon Glass sjg@chromium.org
Applied to u-boot/master, thanks!