add dummy functions to avoid build failure when header files are included, but drivers are not built. Signed-off-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
add dummy functions to avoid build failure when header files are included, but drivers are not built. Signed-off-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>