Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding

On 10/30, Viresh Kumar wrote:

+- opp-supported-hw: User defined array containing a hierarchy of hardware

• version numbers, supported by the OPP. For example: a platform with hierarchy
• of three levels of versions (A, B and C), this field should be like <X Y Z>,
• where X corresponds to Version hierarchy A, Y corresponds to version hierarchy
• B and Z corresponds to version hierarchy C.
• Each level of hierarchy is represented by a 32 bit value, and so there can be
• only 32 different supported version per hierarchy. i.e. 1 bit per version. A
• value of 0xFFFFFFFF will enable the OPP for all versions for that hierarchy
• level. And a value of 0x00000000 will disable the OPP completely, and so we
• never want that to happen.

I suppose if you wanted to have 64 possible combinations of some attribute you would just extend it to two 32 bit numbers in sequence? I don't see the limitation here, and hopefully there isn't a limitation so that we can specify sufficiently large numbers with more bits if we need to.