songruo 60bb5c913d clk_tree: prework of introducing clk subsystem control
1. Clean up clk usage in IDF, replace rtc_clk_xtal/apb_freq_get with
   upper level API esp_clk_xtal/apb_freq
2. Fix small errors and wrong comments related to clock
3. Add clk_tree_defs.h to provide an unified clock id for each chip
   Modify the NGed drivers to adopt new clock ids
2022-04-11 12:09:06 +08:00
..
2022-01-19 11:08:57 +08:00
2021-07-16 20:14:27 +08:00