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Re: [PATCH V3 2/6] of/slimbus: OF helper for SLIMbus

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On Mon, Aug 03, 2015 at 11:13:55AM -0500, Rob Herring wrote:
> On Mon, Aug 3, 2015 at 1:59 AM, Sagar Dharia <sdharia@codeaurora.org> wrote:

> > +Optional:
> > +- compatible   - Slave devices can use compatible field to have a name.
> > +               If this field is missing, name of the device will be
> > +               determined using slave's enumeration address.
> > +               (e.g. in the example below, slave's name will be:
> > +               0x217:0x60:0x1:0x0)

> Are devices discoverable and uniquely identifiable? This would be
> something like a VID/PID which can be read in a generic way. It looks
> like the address contains this info, but can you discover the
> addresses of devices on the bus? If not compatible should not be
> optional.

Yes, the bus is enumerable.  However in essentially all implementations
devices won't enumerate without some additional non-standard work being
done to power them on since applications tend to be extremely power
sensitive relative to the basic operating cost of the bus.  Which is
entertaining.

This probably means that the binding needs to say that the compatible is
optional but that for all practical purposes Linux requires it until
such time as someone decides it's worth supporting systems that can
usefully enumerate.

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[PATCH V3 0/6] Introduce framework for SLIMbus device drivers Sagar Dharia <sdharia@codeaurora.org> - 2015-08-03 09:10 +0200
  [PATCH V3 2/6] of/slimbus: OF helper for SLIMbus Sagar Dharia <sdharia@codeaurora.org> - 2015-08-03 09:10 +0200
    Re: [PATCH V3 2/6] of/slimbus: OF helper for SLIMbus Rob Herring <robherring2@gmail.com> - 2015-08-03 18:20 +0200
      Re: [PATCH V3 2/6] of/slimbus: OF helper for SLIMbus Mark Brown <broonie@kernel.org> - 2015-08-04 19:30 +0200
      Re: [PATCH V3 2/6] of/slimbus: OF helper for SLIMbus Sagar Dharia <sdharia@codeaurora.org> - 2015-08-06 21:20 +0200
  [PATCH V3 5/6] slimbus: Add support for 'clock-pause' feature Sagar Dharia <sdharia@codeaurora.org> - 2015-08-03 09:10 +0200
    Re: [PATCH V3 5/6] slimbus: Add support for 'clock-pause' feature Mark Brown <broonie@kernel.org> - 2015-08-15 04:20 +0200
      Re: [PATCH V3 5/6] slimbus: Add support for 'clock-pause' feature Sagar Dharia <sdharia@codeaurora.org> - 2015-08-18 01:50 +0200
  [PATCH V3 3/6] slimbus: Add messaging APIs to slimbus framework Sagar Dharia <sdharia@codeaurora.org> - 2015-08-03 09:10 +0200
    Re: [PATCH V3 3/6] slimbus: Add messaging APIs to slimbus framework Mark Brown <broonie@kernel.org> - 2015-08-15 04:20 +0200
      Re: [PATCH V3 3/6] slimbus: Add messaging APIs to slimbus framework Mark Brown <broonie@kernel.org> - 2015-08-15 04:20 +0200
  [PATCH V3 1/6] SLIMbus: Device management on SLIMbus Sagar Dharia <sdharia@codeaurora.org> - 2015-08-03 09:10 +0200
    Re: [PATCH V3 1/6] SLIMbus: Device management on SLIMbus Mark Brown <broonie@kernel.org> - 2015-08-15 04:20 +0200
  Re: [PATCH V3 0/6] Introduce framework for SLIMbus device drivers Mark Brown <broonie@kernel.org> - 2015-08-15 04:20 +0200

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