On Mon, 01 Sep 2014, Octavian Purdila wrote: > On Mon, Sep 1, 2014 at 11:37 AM, Lee Jones <lee.jones@xxxxxxxxxx> wrote: > > On Sat, 30 Aug 2014, Octavian Purdila wrote: > > > >> This patch implements the USB part of the Diolan USB-I2C/SPI/GPIO > >> Master Adapter DLN-2. Details about the device can be found here: > >> > >> https://www.diolan.com/i2c/i2c_interface.html. > >> > >> Information about the USB protocol can be found in the Programmer's > >> Reference Manual [1], see section 1.7. > >> > >> Because the hardware has a single transmit endpoint and a single > >> receive endpoint the communication between the various DLN2 drivers > >> and the hardware will be muxed/demuxed by this driver. > >> > >> Each DLN2 module will be identified by the handle field within the DLN2 > >> message header. If a DLN2 module issues multiple commands in parallel > >> they will be identified by the echo counter field in the message header. > >> > >> The DLN2 modules can use the dln2_transfer() function to issue a > >> command and wait for its response. They can also register a callback > >> that is going to be called when a specific event id is generated by > >> the device (e.g. GPIO interrupts). The device uses handle 0 for > >> sending events. > >> > >> [1] https://www.diolan.com/downloads/dln-api-manual.pdf > > > > MFD is not a dumping ground for misfit h/w. Almost all of this code > > looks like it belongs in drivers/usb. Please move it there. > > > > We initially submitted this driver as a pure USB driver, with our own > module registration mechanism, but during the first round of reviews > people pointed out that a MFD driver is the better approach, and I > agree. I also see that there are already a couple of USB drivers > implemented as MFD drivers. Can you link me to your previous submission please? > Do you see a better approach? You should have a small MFD driver which controls resources and registers children. All other functionality should live in their respective drivers/X locations i.e. USB functionallity should normally live in drivers/usb. -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- 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
