On Wed, Sep 09, 2009 at 03:44:01PM -0700, Greg KH wrote: > On Wed, Sep 09, 2009 at 09:09:21AM -0700, Amit Uttamchandani wrote: > > On Wed, Sep 09, 2009 at 06:44:05AM -0700, Greg KH wrote: > > > On Wed, Sep 09, 2009 at 12:34:03AM -0700, Amit Uttamchandani wrote: > > > > > > > > I am interested in using mdio-gpio driver to emulate the MDIO bus over > > > > GPIO. This is needed to control the SMSC LAN 8700 PHY. Now, there is a > > > > driver that already exists to control the phy (smsc.c). > > > > > > > > How do I 'connect' the two drivers? Do I write a new driver? Or do I use > > > > the mdio-gpio to set up the necessary pins, and then the smsc.c phy > > > > driver (which uses MDIO already) will automatically use the mdio over > > > > gpio. > > > > > > The later option sounds like a good idea, have you tried this to see if > > > it works? > > > > > > > > Thanks for the reply Greg. > > > > I haven't tried the latter option as I am not too sure how this is done. > > I am thinking right now I have to load the driver (mdio-gpio) first. But > > then after this I'm lost. Where do I configure which GPIO pins to use? > > There must be some userspace app/config to do that correct? > > Yes, you can do this from userspace through sysfs. Look at > Documentation/gpio.txt > Thanks. I was able to toggle LEDs using the userspace method. Now, I was able to figure out how to load the mdio-gpio driver. lsmod shows that it is loaded and loads mdio-bitbang as well because of dependency. At this point, I do not know which pins are associated with this mdio-gpio driver. 1. /sys/bus/mdio_bus - Is loaded properly and contains drivers for the MDIO based PHYs. 2. /sys/module/mdio_gpio/drivers/mdio-gpio - Has a 'bind' file. I guess I have to bind this driver to some device (the gpio device?). 3. Doing a search for mdio* under the root directory reveals the following: ./sys/bus/platform/drivers/mdio-gpio ./sys/bus/mdio_bus ./sys/class/mdio_bus ./sys/module/smsc/drivers/mdio_bus:SMSC LAN83C185 ./sys/module/smsc/drivers/mdio_bus:SMSC LAN8187 ./sys/module/smsc/drivers/mdio_bus:SMSC LAN8700 ./sys/module/smsc/drivers/mdio_bus:SMSC LAN911x Internal PHY ./sys/module/mdio_bitbang ./sys/module/mdio_bitbang/holders/mdio_gpio ./sys/module/mdio_gpio Any ideas on how to do this? Thanks for any help. Amit _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
