regulator

http://blog.csdn.net/walkingman321/article/details/6987769

http://blog.csdn.net/xqhrs232/article/details/6725489

http://jessyshen.blog.sohu.com/167591820.html

http://blog.chinaunix.net/uid-20514606-id-3045107.html

http://blog.chinaunix.net/uid-20514606-id-3045109.html

http://blog.163.com/lzh_327/blog/static/7219480201164102919321/

http://www.cnblogs.com/heimi/archive/2012/12/11/2812534.html

http://www.slimlogic.co.uk/wp-content/uploads/2009/02/voltage-slimlogic.pdf

http://elinux.org/images/c/c1/Regulator-api-celf.pdf

http://blog.sina.com.cn/s/blog_53c733350100zgz7.html

http://free-electrons.com/doc/power-management.pdf