topic Re: bus speed of /dev/i2c-2 on imx6q in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/bus-speed-of-dev-i2c-2-on-imx6q/m-p/252859#M23511 <HTML><HEAD></HEAD><BODY><P>Attached is the porting guide. I hope this is useful for you. </P></BODY></HTML> Thu, 15 Aug 2013 09:28:05 GMT jimmychan 2013-08-15T09:28:05Z bus speed of /dev/i2c-2 on imx6q https://community.nxp.com/t5/i-MX-Processors/bus-speed-of-dev-i2c-2-on-imx6q/m-p/252858#M23510 <HTML><HEAD></HEAD><BODY><P>Hello everyone, </P><P>I am unaware as to who sets clock speed on the i2c bus and specifically on the /dev/i2c-2 which is exposed on the board so as to drive external equipment.</P><P>I am looking into the linux-boundary kernel files in yocto (dylan) build dir, but I cannot figure out where that is set.</P><P>To be honest I don't even know if i'll find that info there, but it seems like the right place to start (after googling about it of course).</P><P></P><P>So who determined the speed (standard mode, fast mode, etc) for the external i2c? if it is a driver , which one should I be looking for?</P><P></P><P>The reason is I am trying to drive some TMC222 low-power stepper motor control ICs, but they do not respond.</P><P>Note I have successfully connected a number of other i2c ICs (among others the pca9505x).</P><P></P><P>An answer is not necessary. Any pointers as to how to go about it , so I can learn about this is more than welcome.</P><P>Thank you for your help.</P></BODY></HTML> Tue, 13 Aug 2013 18:15:08 GMT https://community.nxp.com/t5/i-MX-Processors/bus-speed-of-dev-i2c-2-on-imx6q/m-p/252858#M23510 synthnassizer 2013-08-13T18:15:08Z Re: bus speed of /dev/i2c-2 on imx6q https://community.nxp.com/t5/i-MX-Processors/bus-speed-of-dev-i2c-2-on-imx6q/m-p/252859#M23511 <HTML><HEAD></HEAD><BODY><P>Attached is the porting guide. I hope this is useful for you. </P></BODY></HTML> Thu, 15 Aug 2013 09:28:05 GMT https://community.nxp.com/t5/i-MX-Processors/bus-speed-of-dev-i2c-2-on-imx6q/m-p/252859#M23511 jimmychan 2013-08-15T09:28:05Z