On 08/23/18 03:33, Linus Walleij wrote: > 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 For the moment, NACK since there is not a substantive change from before. This is without having read beyond this introduction. I will read through the rest of the series and revisit my previous conclusions, but most likely not for a few days. -Frank > > .../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 >
