dt-bindings: gpio: document the new pull-up/pull-down flags
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. It is the backport of linux commit ede033e1e863c ('dt-bindings: gpio: document the new pull-up/pull-down flags') from Thomas Petazzoni <thomas.petazzoni@bootlin.com> and integrated in v5.1-rc1 https://github.com/torvalds/linux/commit/ede033e1e863cSigned-off-by: NPatrick Delaunay <patrick.delaunay@st.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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