Jon Loeliger wrote at Wednesday, January 11, 2012 7:38 AM: > > On Tue, Jan 10, 2012 at 01:54:30PM -0800, Stephen Warren wrote: > > > John, David, > > > > > > What can we do to reach consensus on expanding dtc to handle named > > > constants, or in general any future direction to extend the syntax with > > > expressions etc.? > > > > Hrm, so, I'm not at all keen to add a named constant syntax without at > > least having an outline of what a future macro/function syntax would > > look like. > > Which is where I thought it was left earlier...? :-) > And it's not just what the macro/function syntax will look like, > but also how these will play into a more generalized expression > handling mechanism. Defining something one-off now that doesn't > fit well into a long term plan is less than ideal. > > Yes, I know that is tantamount to requiring the whole, larger > picture be solved first. But Dave is right -- at least an outline > of the direction. Seriously, the lexical problems can form some > of the nastiest gotchas if we're not careful from the onset.
So that all makes sense. My question is: How can we get consensus on what we want that complete future syntax to be? IIRC, Jon has a branch that implements a proposal, and David at least posted a different proposal if not actual code that implemented it. We're not missing proposals, but rather a mechanism to decide between them? For what it's worth, I'd tend towards a simple expression-based syntax where property values can be calculated with C-style expressions. Basic math stuff like ( ) + - * / & | ~ << >> and some basic string handling operations (str(int) and concatenation). I think that'd cover the vast majority of use-cases wouldn't it? For more advanced stuff like loops to synthesize multiple nodes, it seems like writing a custom script to generate the .dts file and then passing the result to dtc would be more modular, and not require us to create a whole new Turing-complete language in dtc? -- nvpublic _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
