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

From	Stephen Boyd <sboyd@codeaurora.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding
Date	2015-10-30 22:50 +0100
Message-ID	<qppIB-2BU-5@gated-at.bofh.it> (permalink)
References	<qp6FY-7Nj-7@gated-at.bofh.it> <qp6FY-7Nj-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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.

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Thread

[PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Viresh Kumar <viresh.kumar@linaro.org> - 2015-10-30 02:30 +0100
  Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Stephen Boyd <sboyd@codeaurora.org> - 2015-10-30 22:50 +0100
    Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Viresh Kumar <viresh.kumar@linaro.org> - 2015-10-31 03:20 +0100
      Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Stephen Boyd <sboyd@codeaurora.org> - 2015-11-02 20:30 +0100
        Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Viresh Kumar <viresh.kumar@linaro.org> - 2015-11-03 03:20 +0100
          Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Stephen Boyd <sboyd@codeaurora.org> - 2015-11-04 23:20 +0100
    Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Viresh Kumar <viresh.kumar@linaro.org> - 2015-11-02 17:10 +0100
  Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Stephen Boyd <sboyd@codeaurora.org> - 2015-10-30 23:20 +0100
    Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Viresh Kumar <viresh.kumar@linaro.org> - 2015-10-31 03:30 +0100
      Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Rob Herring <robh+dt@kernel.org> - 2015-11-02 16:20 +0100
        Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Viresh Kumar <viresh.kumar@linaro.org> - 2015-11-02 17:10 +0100
      Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Stephen Boyd <sboyd@codeaurora.org> - 2015-11-02 20:30 +0100
    Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Viresh Kumar <viresh.kumar@linaro.org> - 2015-11-03 03:40 +0100
      Re: [PATCH 1/3] PM / OPP: Add "opp-supported-hw" binding Stephen Boyd <sboyd@codeaurora.org> - 2015-11-04 23:10 +0100

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