Hello, This series adds device tree overlay support loosely based on the Linux driver. In contrast to Linux, the overlay is not applied to the live tree, but registered as a device tree fixup. This allows to apply the overlay to the build-in device tree and external device trees, which is necessary for booting Linux with an overlaid device tree. I further added the "devicetree-overlay" key to the blspec. This allows to specify device tree overlays that should be applied before booting the OS from that blspec entry. Note that if an overlay fails to apply, Linux still would boot normally with the base device tree. The RFC extended the oftree command, but I now defined a new "of_overlay" command that accepts the file name of the overlay as an argument. Having a separate command with separate options for overlays looks much cleaner to me. Compared to the RFC, I dropped the notifiers, because they are too limited to get information from the module that registers the overlay to the module that is notified and reacts on an overlay. Now, any other module that should react on an overlay must be called explicitly. Michael Changelog: rfc -> v1: - new of_overlay command - no more notifiers for device tree overlays Michael Tretter (7): dtc: add -@ option to enable __symbols__ of: add support for devicetree overlays blspec: add support for devicetree overlays of: add iterator for overlays firmware: add support to load firmware from dt overlay blspec: load firmware if specified in dt overlay commands: add of_overlay command for device tree overlays Documentation/user/booting-linux.rst | 4 + commands/Kconfig | 12 ++ commands/Makefile | 1 + commands/of_overlay.c | 89 +++++++++ common/blspec.c | 75 ++++++++ common/firmware.c | 77 ++++++++ drivers/of/Kconfig | 9 + drivers/of/Makefile | 1 + drivers/of/overlay.c | 245 +++++++++++++++++++++++ drivers/of/resolver.c | 278 +++++++++++++++++++++++++++ include/firmware.h | 3 + include/of.h | 33 ++++ scripts/Makefile.lib | 2 +- 13 files changed, 828 insertions(+), 1 deletion(-) create mode 100644 commands/of_overlay.c create mode 100644 drivers/of/overlay.c create mode 100644 drivers/of/resolver.c -- 2.20.1 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
