+Rob On 25/04/16 14:59, Roger Quadros wrote: > Hi, > > We are working on getting Linux on AM335X Industrial Communication Engine board (ICE) [1]. > > This board has 2 Ethernet ports and each of them can be used either in RMII mode connected to > the CPSW Ethernet MAC *or* in MII mode connected to the PRU Ethernet MAC. > > The decision about the Ethernet port's mode is made by the user by setting a jumper near the > Ethernet port before power up. This is a boot time configurable setting and doesn't need to > change at runtime. > > So 4 configurations are possible: > ETH0 ETH1 > ---- ---- > RMII RMII > RMII MII > MII RMII (probably redundant and not needed) > MII MII > > Based on the port configuration, software (u-boot or Linux) needs to set the right pinmux, > set a GPIOs (that controls external Mux), configure an external clock generator > and enable the right device driver for the respective Ethernet port. > > Clock generator needs to be configured because different clock rates are required > for RMII vs MII mode. > > Now question is how all this can be done on u-boot + Linux? > > I already have a working solution where I create different DT blobs for the 3 configurations > and have u-boot detect the mode and load the correct DT blob and also configure the clock. > > You can see how the kernel patches look like here [2] > > Is this approach acceptable? If not is there any better way to do this? Thanks. > > cheers, > -roger > > [1] AM3359 ICE board > http://www.ti.com/tool/tmdsice3359 > http://processors.wiki.ti.com/index.php/AM335x_Industrial_Communication_Engine_%28ICE%29_EVM_HW_User_Guide There are 2 ICE board version. v1 and v2. The above wiki link is wrong. We are dealing with the v2 board below http://processors.wiki.ti.com/index.php/AM335x_Industrial_Communication_Engine_EVM_Rev2_1_HW_User_Guide > > [2] Device tree patches > https://github.com/rogerq/linux/commit/9a9cf6a15f779fddf91dba2370627aabf19aeff5 > https://github.com/rogerq/linux/commit/c87e8fa5b14f156a91883fd506e9dd8f7ccf95cf > https://github.com/rogerq/linux/commit/d9cdd25e8c3878292d7f4180af8d3ac42b9645c4 > > cheers, -roger -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
