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272bb0e9e8
After performing an unbind/bind operation the network is no longer functional on i.MX6 (which has a single FEC instance): # echo 2188000.ethernet > /sys/bus/platform/drivers/fec/unbind # echo 2188000.ethernet > /sys/bus/platform/drivers/fec/bind [ 10.756519] pps pps0: new PPS source ptp0 [ 10.792626] libphy: fec_enet_mii_bus: probed [ 10.799330] fec 2188000.ethernet eth0: registered PHC device 1 # udhcpc -i eth0 udhcpc: started, v1.31.1 [ 14.985211] fec 2188000.ethernet eth0: no PHY, assuming direct connection to switch [ 14.993140] libphy: PHY fixed-0:00 not found [ 14.997643] fec 2188000.ethernet eth0: could not attach to PHY On SoCs with two FEC instances there are some cases where one FEC instance depends on the other one being present. One such example is i.MX28, which has the following FEC dependency as noted in the comments: /* * The i.MX28 dual fec interfaces are not equal. * Here are the differences: * * - fec0 supports MII & RMII modes while fec1 only supports RMII * - fec0 acts as the 1588 time master while fec1 is slave * - external phys can only be configured by fec0 * * That is to say fec1 can not work independently. It only works * when fec0 is working. The reason behind this design is that the * second interface is added primarily for Switch mode. * * Because of the last point above, both phys are attached on fec0 * mdio interface in board design, and need to be configured by * fec0 mii_bus. */ Prevent the unbind operation to avoid these issues. Signed-off-by: Fabio Estevam <festevam@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.