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Old 10-16-2017, 01:05 PM   #1
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What is the difference between reg_defaults and reg_defaults_raw in regmap facility?

When configuring regmap, it is possible to include a list of power on defaults for the registers. As I understand it, the purpose is to pre-populate the cache in order to avoid an initial read after power on or after waking up. I'm confused by the fact that there is both a reg_defaults and a reg_defaults_raw field. The comments in include/linux/regmap.h for those two fields are identical. It appears that only one or the other is ever used, the vast majority of drivers using reg_defaults however there's a small handful that use reg_defaults_raw. I did look through the git history and found the commit that introduced reg_defaults and the later commit that introduced reg_defaults_raw. Unfortunately I wasn't able to divine the reason for that new field.

Does anyone know the difference between those fields?


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