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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> |
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| .. | ||
| arm | ||
| bus | ||
| clk | ||
| clock | ||
| display | ||
| dma | ||
| firmware/imx | ||
| gce | ||
| gpio | ||
| i2c | ||
| iio | ||
| input | ||
| interrupt-controller | ||
| leds | ||
| mailbox | ||
| media | ||
| memory | ||
| mfd | ||
| mips | ||
| mux | ||
| net | ||
| phy | ||
| pinctrl | ||
| power | ||
| pwm | ||
| regulator | ||
| reset | ||
| soc | ||
| sound | ||
| spmi | ||
| thermal | ||
| usb | ||