Hi there! on custom AM37x board running 2.6.37 this was enough to enable gpio 67: echo 71 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio71/direction echo 1 > /sys/class/gpio/gpio71/value However, with DT configured linux-4.2 compiled using omap2plus_defconfig this no longer works. Using devmme2 utility, these are register values read from system running 2.6.37 kernel. CONTROL_SYSCONFIG 0x48002010: 0x1 CONTROL_PADCONF_DSS_DATA0 0x480020DC: 0x1040104 CONTROL_PADCONF_OFF 0x48002270: 0x0 CONTROL_DEVCONF0 0x48002274: 0x5000000 GPIO_SYSCONFIG 0x49052010: 0x15 GPIO_CTRL 0x49052030: 0x0 GPIO_OE 0x49052034: 0xFFFFFF17 GPIO_DATAOUT 0x4905203C: 0x80 Relevant bits are the same on 4.2 kernel. Also, zeroing OE and writing to GPIO_DATAOUT it is possible to enable gpio81 and 80, 83, 69 (light LED), but not gpio71 or 70 or 69 (muxing done with DT) For testing purposes function drivers/gpio/gpio-omap.c:omap_gpio_restore_context was set to no-op. Any pointers where to look next? Thank you, ladis -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
