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Add support for the optional power-supply. Note: A "dummy regulator" is returned by devm_regulator_get() if the optional regulator is not present in the device tree, simplifying the source code when enabling/disabling the regulator. Signed-off-by: Philippe Cornu <philippe.cornu@st.com> Reviewed-by: Yannick Fertré <yannick.fertre@st.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180205094532.23547-3-philippe.cornu@st.com