https://community.nxp.com/t5/Linux-Embedded-Challenge/SPI-driver-not-working-as-expected-on-powerpc-hardware-platform/m-p/2378063#M136 <P>Hello, all,<BR />I have old build system with inbuild kernel (2.6.73.x) and my application successfully compiles and working on our custom Linux board(based on PowerPC architecture) fine.<BR />Now we migrated to YOCTO build system where latest kernel (6.x.x) is there. Now I observed that SPI devices not working as expected(which was working with old build system).<BR />I know there is lot of dynamics/parameter changed with big jump in kernel version(hench in SPI driver). I have put some delay in change mode and control chip select API, it improve somewhat but not successful.<BR />I have tried with many experiment to change SPI controller parameter but not get succeed. I have got some help from internet but not resolved my issue. As per me it is timing related issue. But i don't know exact location where to fix.<BR />So, if you faced this type or similar challenge then you can lead/help. I appreciate any suggestion/fix/help/direction.</P><P>Thank you<BR />Bharat</P> Mon, 08 Jun 2026 05:34:54 GMT bharatbhardava 2026-06-08T05:34:54Z https://community.nxp.com/t5/Linux-Embedded-Challenge/SPI-driver-not-working-as-expected-on-powerpc-hardware-platform/m-p/2378063#M136 <P>Hello, all,<BR />I have old build system with inbuild kernel (2.6.73.x) and my application successfully compiles and working on our custom Linux board(based on PowerPC architecture) fine.<BR />Now we migrated to YOCTO build system where latest kernel (6.x.x) is there. Now I observed that SPI devices not working as expected(which was working with old build system).<BR />I know there is lot of dynamics/parameter changed with big jump in kernel version(hench in SPI driver). I have put some delay in change mode and control chip select API, it improve somewhat but not successful.<BR />I have tried with many experiment to change SPI controller parameter but not get succeed. I have got some help from internet but not resolved my issue. As per me it is timing related issue. But i don't know exact location where to fix.<BR />So, if you faced this type or similar challenge then you can lead/help. I appreciate any suggestion/fix/help/direction.</P><P>Thank you<BR />Bharat</P> Mon, 08 Jun 2026 05:34:54 GMT https://community.nxp.com/t5/Linux-Embedded-Challenge/SPI-driver-not-working-as-expected-on-powerpc-hardware-platform/m-p/2378063#M136 bharatbhardava 2026-06-08T05:34:54Z https://community.nxp.com/t5/Linux-Embedded-Challenge/SPI-driver-not-working-as-expected-on-powerpc-hardware-platform/m-p/2378835#M137 <P>It will be very helpful if you reply if you have suggestion.</P> Tue, 09 Jun 2026 08:59:14 GMT https://community.nxp.com/t5/Linux-Embedded-Challenge/SPI-driver-not-working-as-expected-on-powerpc-hardware-platform/m-p/2378835#M137 bharatbhardava 2026-06-09T08:59:14Z