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Introduce the rpmsg_chrdev_eptdev_alloc and rpmsg_chrdev_eptdev_add internal function to split the allocation part from the device add. This patch prepares the introduction of a rpmsg channel device for the char device. An default endpoint will be created, referenced in the rpmsg_eptdev structure before adding the devices. Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/20220124102524.295783-9-arnaud.pouliquen@foss.st.com