How to build a platform drivers into a kernel module with yocto?

Question

The goal is to put an existing (in-source kernel) device driver into an external kernel module. The device driver is put together into a struct platform_driver instance, then is registered with module_platform_driver() macro. The macro is supposed to be implementing the module_init() and module_exit() functions necessary for a Linux kernel module definition, however with below Makefile Yocto throws multiple errors, one of them being: aarch64-poky-linux-ld.bfd: no input files

The Makefile:

obj-m += my-mod-lkm.o 
my-mod-lkm-y := my-mod.c

SRC := $(shell pwd)

all:
    $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules

modules_install:
    $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules_install

clean:
    $(MAKE) -C $(KERNEL_SRC) M=$(SRC) clean

Does Yocto not support the module_init/module_exit macros? I noticed that it does compile a simple module:

#include <linux/module.h> /* Needed by all modules */ 
#include <linux/kernel.h>
#include <linux/printk.h> /* Needed for pr_info() */ 

int init_module(void)
{
    pr_info("My module initiated!");
    return 0;
}

void cleanup_module(void)
{
    pr_info("My module exited!");
}
MODULE_LICENSE("GPL");

Why would the latter work and the more recent way of using module_init() / module_exit() not? Is it right to assume that simple call to module_platform_driver() is enough to put a platform_driver into a kernel module?