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pinctrl: Add RTL8231 pin control and GPIO support
This driver implements the GPIO and pin muxing features provided by the RTL8231. The device should be instantiated as an MFD child, where the parent device has already configured the regmap used for register access. Debouncing is only available for the six highest GPIOs, and must be emulated when other pins are used for (button) inputs. Although described in the bindings, drive strength selection is currently not implemented. Signed-off-by: Sander Vanheule <sander@svanheule.net>
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