Driver porting: Device model overview: http://lwn.net/Articles/31185/
The Linux Kernel Driver Model
- What infomation was included in dtb
HW platform识别，runtime parameter传递以及硬件设备描述
for platform device init see arch/powerpc/platforms/52xx/media5200.c ppc_init
- How does the device tree subsystem read and parse the dts file?
devm_kfree does not need for fail case of probe function and for remove function.
- a must use devm_kfree Julia Lawall
The function at91_dt_node_to_map is ultimately called by the function
> pinctrl_get, which is an exported function. Since it is possible that this
> function is not called from within a probe function, for safety, the kfree
> is converted to a devm_kfree, to both free the data and remove it from the
> device in a failure situation.
*for noop devm_kmalloc_release
devm_kmalloc()->dr = alloc_dr(devm_kmalloc_release, size, gfp);
see release_nodes() ->kfree(dr);