GE Healthcare PPD firmware upgrade driver for ACHC Hi, The PPD has a secondary processor (NXP Kinetis K20) , which can be programmed from the main system. It is connected to the main processor by having it's EzPort interface connected to the SPI bus. Currently both (normal and EzPort) interfaces are simply exposed to userspace. This does not work for the EzPort, since EzPort usage requires a device reset. The proper solution is to do the flashing from kernel space with properly timed toggling of EzPort chip-select and reset line. In PATCHv2 it was suggested, that this should happen via an SPI ancillary device, so this has now been implemented in PATCHv3. I'm a bit unhappy with the spidev_probe() call in gehc-achc driver, but it also seems like a bad idea to add all that code to generic spidev driver. If somebody has a better idea I'm all ears. Other than that patch 2, which modifies the spi-controller.yaml to allow multiple reg properties seems to be incorrect, but I did not find the problem. I hope Rob can point out what I'm missing. Changes since PATCHv2: * https://lore.kernel.org/lkml/20180327135259.30890-1-sebastian.reichel@xxxxxxxxxxxxxxx/ * add SPI core support for ancillary devices * modify ACHC binding to make use of ancillary device * rewrite driver to use ancillary device * rebased to 5.13-rc1 Changes since PATCHv1: * https://lore.kernel.org/lkml/20180320172201.2065-1-sebastian.reichel@xxxxxxxxxxxxxxx/ * split DT binding update into its own patch * add sysfs attribute documentation * fix problem reported by kbuild test robot Sorry for the very long delay since PATCHv2 and thanks for looking into this, -- Sebastian Sebastian Reichel (5): spi: add ancillary device support spi: dt-bindings: support devices with multiple chipselects dt-bindings: misc: ge-achc: Convert to DT schema format ARM: dts: imx53-ppd: Fix ACHC entry misc: gehc-achc: new driver .../devicetree/bindings/misc/ge-achc.txt | 26 - .../devicetree/bindings/misc/ge-achc.yaml | 67 +++ .../bindings/spi/spi-controller.yaml | 7 +- arch/arm/boot/dts/imx53-ppd.dts | 23 +- drivers/misc/Kconfig | 15 + drivers/misc/Makefile | 2 + drivers/misc/gehc-achc.c | 160 ++++++ drivers/misc/nxp-ezport.c | 476 ++++++++++++++++++ drivers/spi/spi.c | 139 +++-- drivers/spi/spidev.c | 7 +- include/linux/platform_data/nxp-ezport.h | 9 + include/linux/spi/spi.h | 7 + 12 files changed, 865 insertions(+), 73 deletions(-) delete mode 100644 Documentation/devicetree/bindings/misc/ge-achc.txt create mode 100644 Documentation/devicetree/bindings/misc/ge-achc.yaml create mode 100644 drivers/misc/gehc-achc.c create mode 100644 drivers/misc/nxp-ezport.c create mode 100644 include/linux/platform_data/nxp-ezport.h -- 2.30.2
