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dtc/tests/subnode_iterate.dts

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libfdt: Add fdt_next_subnode() to permit easy subnode iteration Iterating through subnodes with libfdt is a little painful to write as we need something like this: for (depth = 0, count = 0, offset = fdt_next_node(fdt, parent_offset, &depth); (offset >= 0) && (depth > 0); offset = fdt_next_node(fdt, offset, &depth)) { if (depth == 1) { /* code body */ } } Using fdt_next_subnode() we can instead write this, which is shorter and easier to get right: for (offset = fdt_first_subnode(fdt, parent_offset); offset >= 0; offset = fdt_next_subnode(fdt, offset)) { /* code body */ } Also, it doesn't require two levels of indentation for the loop body. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: David Gibson <david@gibson.dropbear.id.au>
12 years ago
/dts-v1/;
/ {
#address-cells = <1>;
#size-cells = <0>;
test1 {
subnodes = <2>;
linux,phandle = <0x1>;
#address-cells = <1>;
#size-cells = <0>;
PowerPC,970@0 {
name = "PowerPC,970";
device_type = "cpu";
reg = <0x00000000>;
clock-frequency = <1600000000>;
timebase-frequency = <33333333>;
linux,boot-cpu;
i-cache-size = <65536>;
d-cache-size = <32768>;
another-sub-node {
should-be-ignored;
yet-another {
should-also-be-ignored;
};
};
};
PowerPC,970@1 {
name = "PowerPC,970";
device_type = "cpu";
reg = <0x00000001>;
clock-frequency = <1600000000>;
timebase-frequency = <33333333>;
i-cache-size = <65536>;
d-cache-size = <32768>;
};
};
test2 {
subnodes = <0>;
};
};