[+cc Wolfram] On Mon, Sep 29, 2014 at 10:46 PM, Rajat Jain <rajatxjain@xxxxxxxxx> wrote: > Most of the PLX PCI Express switches (and also switches from other vendors such > IDT) provide an I2C based secondary interface to access and program the switch. > This can be used to program the switch in situations where the PCIe interface > may not be suitable, or even available. (For instance, we may need to program > the device in a particular fashion before we even begin enumerating on the PCI, > or to even enable the PCIe interface of the device). More information on > usecases and other details has been provided in the documentation being added > as part of this patchset. > > This is a driver that allows talking to the PLX PEX8xxx family of PCIe switches > over its I2C interface. Here are the patch descriptions: > > [Patch 1/4] - Adds the PEX8xxx driver that exports API calls to read / write. > [Patch 2/4] - Adds a sysfs interface, to allow access to the switch. > [Patch 3/4] - Adds the MAINTAINERS entry. > [Patch 4/4] - Adds the documentation in Documentation/PCI/pex8xxx_i2c.txt > > Since this is a driver for a PCIe switch, I currently put it under /driver/pci/. > I'm very open to suggestions for moving this around (Does introducing > drivers/pci/switch/ seem any better?). Especially I can see that the > drivers/pci/Kconfig appears under "Bus Options" in the main menu which does not > look like the right place for this driver. I am looking for suggestions here. Definitely interesting work. I have no idea where to put it. It doesn't have anything to do with PCI core services or structures, so drivers/pci doesn't seem like the ideal place for it, but I don't have any better ideas. If it did end up under drivers/pci, I agree that a drivers/pci/switch or something similar would probably be better than having it directly in drivers/pci. Maybe Wolfram or other I2C folks will have an idea. > Rajat Jain (4): > pci: Add I2C driver for the PLX PEX8xxx PCIe switch > pci/pex8xxx: Add sysfs interface for userspace access. > MAINTAINERS: Add new device driver entry for PEX pex8xxx > Documentation: Add documentation for the PCI switch PEX8xxx I2C > driver > > Documentation/PCI/pex8xxx_i2c.txt | 134 +++++++++ > MAINTAINERS | 7 + > drivers/pci/Kconfig | 13 + > drivers/pci/Makefile | 2 + > drivers/pci/pex8xxx_i2c.c | 538 +++++++++++++++++++++++++++++++++++++ > include/linux/i2c/pex8xxx_i2c.h | 36 +++ > 6 files changed, 730 insertions(+) > create mode 100644 Documentation/PCI/pex8xxx_i2c.txt > create mode 100644 drivers/pci/pex8xxx_i2c.c > create mode 100644 include/linux/i2c/pex8xxx_i2c.h > > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
