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Revise that:
<pre>root@localhost:/sys/kernel/debug/omap_mux# cat sdmmc2_dat6
name: sdmmc2_dat5sdmmc2_dat6.gpio_137 gpio_138 (0x480021660x48002168/0x136 0x138 = 0x0004), b ah3af3, t NA
mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE4
signals: sdmmc2_dat5 sdmmc2_dat6 | sdmmc2_dir_dat1 sdmmc2_dir_cmd | cam_global_reset cam_shutter | sdmmc3_dat1 sdmmc3_dat2 | gpio_137 gpio_138 | hsusb3_tll_stp hsusb3_tll_dir | mm3_rxdp NA | safe_moderoot@localhost:/sys/kernel/debug/omap_mux#
</pre>
Go to: /sys/class/gpio/
