Here is some code I've been experimenting with as part of evaluating what the YAML encoding should be for DT. It adds YAML output to DTC. Pantelis, I know you already wrote a patch[1] that does exactly this. The only reason I wrote a new patch is because I wanted to try a couple of different things: - I want to preserve datatypes and integer groupings from the DT source as much as possible - I want to use an existing yaml emitter (libyaml) instead of raw fprintf() to avoid emitting something that is not quite compatible with YAML. This series consists of two patches. The first patch adds new markers to indicate the datatypes and groupings. The treesource output routines are modified to use the datatype marker information when emitting .dts source. If the new markers are not present (like when reading from a DTB source), then it falls back to the existing scheme of guessing the datatype. The first patch is pretty close to complete. I need to go through the error conditions again, but otherwise it could be merged. Having these markers is generally useful, and could be used as part of validation/schema checks at compile time. For instance, keeping the groupings of interrupt specifiers would make it easier to check that an interrupt specifier is the correct size. I could also see adding an intermediary stage after reading a .dtb file to interpret the properties and add the correct markers wherever possible. phandles could be resolved back to labels in this way, which would make decompiling .dtbs a lot more useful. The second patch is not complete. It cannot be merged until the yaml encoding is nailed down. It also uses libyaml, but I haven't wired in the linker flags correctly. dtc doesn't currently use any external library apart from libc, so I'm not sure how best to add it in. DTC should still compile successfully if libyaml isn't available. [1] https://github.com/pantoniou/dtc/commits/yaml Here's an example of the output with the original source included as comments for comparison. This example comes from tests/label01.dts. # / { # model = "MyBoardName"; # compatible = "MyBoardName", "MyBoardFamilyName"; # #address-cells = <2>; # #size-cells = <2>; - model: ["MyBoardName"] compatible: ["MyBoardName", "MyBoardFamilyName"] '#address-cells': [[0x2]] '#size-cells': [[0x2]] # cpus { # linux,phandle = <0x1>; # #address-cells = <1>; # #size-cells = <0>; cpus: linux,phandle: [[0x1]] '#address-cells': [[0x1]] '#size-cells': [[0x0]] # 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>; # }; PowerPC,970@0: device_type: ["cpu"] reg: [[0x0]] clock-frequency: [[0x5f5e1000]] timebase-frequency: [[0x1fca055]] linux,boot-cpu: true i-cache-size: [[0x10000]] d-cache-size: [[0x8000]] # 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>; # }; PowerPC,970@1: device_type: ["cpu"] reg: [[0x1]] clock-frequency: [[0x5f5e1000]] timebase-frequency: [[0x1fca055]] i-cache-size: [[0x10000]] d-cache-size: [[0x8000]] # node: randomnode { # prop: string = str: "foo", str_mid: "stuffstuff\t\t\t\n\n\n" str_end: ; # blob = [byte: 0a 0b 0c 0d byte_mid: de ea ad be ef byte_end: ]; # ref = < cell: &{/memory@0} 0x0 cell_mid: 0xffffffff cell_end: >; # mixed = "abc", pre: [1234] post: , gap: < aligned: 0xa 0xb 0xc>; # tricky1 = [61 lt1: 62 63 00]; # subnode: child { # }; # /* subnode_end: is auto-generated by node emit */ # }; randomnode: $labels: [node] string: ["foo", "stuffstuff\t\t\t\n\n\n"] blob: [!u8 [0xa, 0xb, 0xc, 0xd, 0xde, 0xea, 0xad, 0xbe, 0xef]] ref: [[!phandle "/memory@0", 0x0, 0xffffffff]] mixed: ["abc", !u8 [0x12, 0x34], [0xa, 0xb, 0xc]] tricky1: [!u8 [0x61, 0x62, 0x63, 0x0]] child: $labels: [subnode] # memory@0 { # device_type = "memory"; # memreg: reg = <0x00000000 0x00000000 0x00000000 0x20000000>; # }; memory@0: device_type: ["memory"] reg: [[0x0, 0x0, 0x0, 0x20000000]] phandle: [[0x2]] # chosen { # bootargs = "root=/dev/sda2"; # linux,platform = <0x600>; # }; chosen: bootargs: ["root=/dev/sda2"] linux,platform: [[0x600]] ... -- To unsubscribe from this list: send the line "unsubscribe devicetree-compiler" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
