pinctrl: st: Add software edge trigger interrupt support
ST pin controller does not have hardware support for detecting edge triggered interrupts, It only has level triggering support. This patch attempts to fake up edge triggers from hw level trigger support in software. With this facility now the gpios can be easily used for keypads, otherwise it would be difficult for drivers like keypads to work with level trigger interrupts. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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