topic Re: imx6sx ; How does Linux change the BCLK frequency ? in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/imx6sx-How-does-Linux-change-the-BCLK-frequency/m-p/486652#M77889 <HTML><HEAD></HEAD><BODY><P>You mentioned is SSI or SAI interface?</P><P></P><P><span class="lia-inline-image-display-wrapper" image-alt="Untitled.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/4787iCAAA25EBE685FD4C/image-size/large?v=v2&amp;px=999" role="button" title="Untitled.png" alt="Untitled.png" /></span></P></BODY></HTML> Fri, 08 Apr 2016 05:05:00 GMT BiyongSUN 2016-04-08T05:05:00Z imx6sx ; How does Linux change the BCLK frequency ? https://community.nxp.com/t5/i-MX-Processors/imx6sx-How-does-Linux-change-the-BCLK-frequency/m-p/486648#M77885 <HTML><HEAD></HEAD><BODY><P>I am setting the BCLK to continuous mode in u-boot, and setting the EIM_SLOW_PODF bits in CSCMR1 to get a 66Mhz external BCLK frequency. When I stop u-boot from booting Linux, then I see the expected 66Mhz clock.</P><P>However, once Linux boots the clock gets changed to 133Mhz. Is this controlled by the device tree?</P><P>If so, can someone provide the required change to reduce this frequency?</P><P></P><P>Thanks</P></BODY></HTML> Wed, 06 Apr 2016 22:39:42 GMT https://community.nxp.com/t5/i-MX-Processors/imx6sx-How-does-Linux-change-the-BCLK-frequency/m-p/486648#M77885 bap3ball 2016-04-06T22:39:42Z Re: imx6sx ; How does Linux change the BCLK frequency ? https://community.nxp.com/t5/i-MX-Processors/imx6sx-How-does-Linux-change-the-BCLK-frequency/m-p/486649#M77886 <HTML><HEAD></HEAD><BODY><P>Hi Bruce</P><P></P><P><CODE>please look at linux documentation../bindings/bus/imx-weim.txt how to set CSxGCR1 :<BR /></CODE></P><P><A href="http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/Documentation/devicetree/bindings/bus/imx-weim.txt?h=imx_3.14.52_1.1.0_ga" title="http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/Documentation/devicetree/bindings/bus/imx-weim.txt?h=imx_3.14.52_1.1.0_ga">linux-2.6-imx.git - Freescale i.MX Linux Tree</A> </P><P></P><P>Best regards</P><P>igor</P><P>-----------------------------------------------------------------------------------------------------------------------</P><P>Note: If this post answers your question, please click the Correct Answer button. Thank you!</P><P>-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Thu, 07 Apr 2016 01:44:33 GMT https://community.nxp.com/t5/i-MX-Processors/imx6sx-How-does-Linux-change-the-BCLK-frequency/m-p/486649#M77886 igorpadykov 2016-04-07T01:44:33Z Re: imx6sx ; How does Linux change the BCLK frequency ? https://community.nxp.com/t5/i-MX-Processors/imx6sx-How-does-Linux-change-the-BCLK-frequency/m-p/486650#M77887 <HTML><HEAD></HEAD><BODY><P>Ok, but I need to run in continuous BCLK which I believe means the BCD in CSxGCR1 must be set to 0.</P><P>When using continuous BCLK mode, how is the BCLK frequency changed? Is there some control of the EIM_WCR in a device tree?</P><P>It looks to me like either setting WCR[GBCD] and WCR[BCM=1] or changing the CSCMR1(slow_podf) could work. Are one of those the preferred method for change BCLK frequency in continuous mode?</P><P>If so, how are those changed in a device tree?</P></BODY></HTML> Thu, 07 Apr 2016 19:52:26 GMT https://community.nxp.com/t5/i-MX-Processors/imx6sx-How-does-Linux-change-the-BCLK-frequency/m-p/486650#M77887 bap3ball 2016-04-07T19:52:26Z Re: imx6sx ; How does Linux change the BCLK frequency ? https://community.nxp.com/t5/i-MX-Processors/imx6sx-How-does-Linux-change-the-BCLK-frequency/m-p/486651#M77888 <HTML><HEAD></HEAD><BODY><P>all CSxGCR can be changed by property: "<CODE>fsl,weim-cs-timing",</CODE></P><P>EIM_WCR seems can not be changed.</P><P>Regarding "how"s&nbsp; for continuous BCLK, suggest to create new thread.</P></BODY></HTML> Fri, 08 Apr 2016 00:34:46 GMT https://community.nxp.com/t5/i-MX-Processors/imx6sx-How-does-Linux-change-the-BCLK-frequency/m-p/486651#M77888 igorpadykov 2016-04-08T00:34:46Z Re: imx6sx ; How does Linux change the BCLK frequency ? https://community.nxp.com/t5/i-MX-Processors/imx6sx-How-does-Linux-change-the-BCLK-frequency/m-p/486652#M77889 <HTML><HEAD></HEAD><BODY><P>You mentioned is SSI or SAI interface?</P><P></P><P><span class="lia-inline-image-display-wrapper" image-alt="Untitled.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/4787iCAAA25EBE685FD4C/image-size/large?v=v2&amp;px=999" role="button" title="Untitled.png" alt="Untitled.png" /></span></P></BODY></HTML> Fri, 08 Apr 2016 05:05:00 GMT https://community.nxp.com/t5/i-MX-Processors/imx6sx-How-does-Linux-change-the-BCLK-frequency/m-p/486652#M77889 BiyongSUN 2016-04-08T05:05:00Z