I have been a bit hesitant to reiterate the series, but this is anyways a v1 of the 96Boards Mezzanine Low Speed connector driver framework. I know the boards have a high speed connector as well, just trying to work stepwise and do the simple things first. What convinced me to continue was very real usecases that exist today, as this makes the secure96 Mezzanine work: - Get something upstream that makes it possible to without any trouble or extensive ugly hacking probe and use the secure96 mezzanine. This is motivated by the IoT design space which needs a way to plug in proper security and the secure96 offers a TPM chip for root of trust and key handling. - A clear indication that the same approach will work just as fine with ACPI without reinventing the universe. I do not have a definitive proof of this, but it is more plausible that this will be reusable for ACPI than any of the DT-centric ideas I've seen for populating daughterboards. There are 96boards using ACPI today. A secure96 TPM is desireable for things like the ARM developer box which has this LS connector: https://www.96boards.org/product/developerbox/ - Some indication that binding the connector like this will not implicate or screw things up for the DT-overlays idea, i.e. a both/and and not either/or approach. The idea is for this to go upstream through ARM SoC the day noone actively NACK it and someone actively ACK it. Expect some more iterations. Linus Walleij (4): eeprom: at24: Allow passing gpiodesc from pdata spi: Make of_find_spi_device_by_node() available bus: Add DT bindings for 96Boards low speed connector bus: 96boards Low-Speed Connector .../bus/96boards,low-speed-connector.txt | 50 +++ drivers/bus/Kconfig | 2 + drivers/bus/Makefile | 4 +- drivers/bus/daughterboards/96boards-ls-bus.c | 39 ++ .../daughterboards/96boards-ls-connector.c | 367 ++++++++++++++++++ .../bus/daughterboards/96boards-mezzanines.h | 77 ++++ .../bus/daughterboards/96boards-secure96.c | 265 +++++++++++++ drivers/bus/daughterboards/Kconfig | 50 +++ drivers/bus/daughterboards/Makefile | 6 + drivers/misc/eeprom/at24.c | 6 +- drivers/spi/spi.c | 33 +- include/linux/platform_data/at24.h | 2 + include/linux/spi/spi.h | 4 + 13 files changed, 888 insertions(+), 17 deletions(-) create mode 100644 Documentation/devicetree/bindings/bus/96boards,low-speed-connector.txt create mode 100644 drivers/bus/daughterboards/96boards-ls-bus.c create mode 100644 drivers/bus/daughterboards/96boards-ls-connector.c create mode 100644 drivers/bus/daughterboards/96boards-mezzanines.h create mode 100644 drivers/bus/daughterboards/96boards-secure96.c create mode 100644 drivers/bus/daughterboards/Kconfig create mode 100644 drivers/bus/daughterboards/Makefile -- 2.17.0
