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This adds a helper function for reading the rotation (panel orientation) from the device tree. Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Tested-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Derek Basehore <dbasehore@chromium.org> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20200813215609.28643-2-digetx@gmail.com