iMX6Q usdhc4 and gpmi muxing

[harshakumar]

Can some one tell how to mux gpmi NAND and usdhc4 pins in imx6 Quad core processor.NAND_RE uses SD4_CMD and NAND_WE uses SD4_CLK PadNets.No other mux option is given.I am using all 4 usdhc for SDIO interfaces and NAND flash for memory.If not able to mux please suggest some SDIO expander chip compatible with imx6Q processor.Please Help

[igorpadykov]

Hi Harsha

for sd one can try spi option with probably some external circuitry or OneNand (weim interface)

or external controllers like, CYWB0124

http://www.mouser.com/ds/2/100/001-07978_CYWB0124AB_CYWB0125AB_WEST_BRIDGE_ANTIOC-369138.pdf 

Best regards
igor
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[harshakumar]

Hi igor

Thanks for suggestion, I am planning to use SDIO port expander TXS02612RTWR which supports two SDXC cards.

But problem is handling card detection interrupt since one card detection pin available in processor side.Can I have any suggestion 

Regards,

Harsha 

[igorpadykov]

Hi Harsha

one can use GPIO for card detection, please refer to sect.32.3.3 Devicetree Binding

attached Linux Manual.

Best regards
igor