mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-21 18:14:48 +08:00
ede033e1e8
This commit extends the flags that can be used in GPIO specifiers to indicate if a pull-up resistor or pull-down resistor should be enabled. While some pinctrl DT bindings already offer the capability of configuring pull-up/pull-down resistors at the pin level, a number of simple GPIO controllers don't have any pinmuxing capability, and therefore do not rely on the pinctrl DT bindings. Such simple GPIO controllers however sometimes allow to configure pull-up and pull-down resistors on a per-pin basis, and whether such resistors should be enabled or not is a highly board-specific HW characteristic. By using two additional bits of the GPIO flag specifier, we can easily allow the Device Tree to describe which GPIOs should have their pull-up or pull-down resistors enabled. Even though the two options are mutually exclusive, we still need two bits to encode at least three states: no pull-up/pull-down, pull-up, pull-down. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> |
||
|---|---|---|
| .. | ||
| aspeed-gpio.h | ||
| gpio.h | ||
| meson8-gpio.h | ||
| meson8b-gpio.h | ||
| meson-axg-gpio.h | ||
| meson-g12a-gpio.h | ||
| meson-gxbb-gpio.h | ||
| meson-gxl-gpio.h | ||
| tegra186-gpio.h | ||
| tegra194-gpio.h | ||
| tegra-gpio.h | ||
| uniphier-gpio.h | ||