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The Synopsys MIPI DSI IP contains a video test pattern generator which is helpful in debugging video timing with connected displays. Add a debugfs directory containing files which allow the VPG to be enabled and disabled, and its orientation to be changed. Signed-off-by: Matt Redfearn <matt.redfearn@thinci.com> Tested-by: Yannick Fertré <yannick.fertre@st.com> Reviewed-by: Philippe Cornu <philippe.cornu@st.com> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190430081646.23845-1-matt.redfearn@thinci.com