Search for path of property-value pair

[alilee]

Nice work!

Do you have any thoughts on adding some search functionality like this?

let reader = Reader::read_from_address(pdtb as usize).unwrap();
let (node, _) = reader.struct_items().path_struct_items("/interrupt-parent").next().unwrap();
let phandle = node.value().unwrap();

let intc_path = reader.struct_items().find_path_to("phandle", phandle).unwrap();

let (intc, _) = reader.struct_items().path_struct_items(intc_path).next().unwrap();

[ababo]

So you need to find path for a given node? IMO it's a really artificial use case.

[alilee]

The scenario is that /interrupt-parent gives the phandle of the interrupt controller. You search through the tree to find the node with the given phandle, when you don't know its name. Check out phandle in the device tree spec. Alternatively, you could search through for interrupt-controller.

[ababo]

@alilee, gotcha. I see it like that:

let reader = unsafe { Reader::read_from_address(pdtb as usize).unwrap(); }
let (prop, _) = reader.struct_items().path_struct_items("/interrupt-parent").next().unwrap();
let phandle = prop.value_u32().unwrap(); // I think we don't have `value_u32()`, I would add it.
let (node, iter) = reader.find_phandle(phandle).unwrap();

Pretty straightforward implementation using StructItems iterator. Feel free to create PR. :0)