GIPO下拉关闭
GPIO158内部下拉关掉方法如下:
arch/arm/mach-lc186x/board/board-xxx.c
在下面comip_mfp_pull_cfg[]里添加：
static struct mfp_pull_cfg comip_mfp_pull_cfg[] = {
{ MFP_PIN_GPIO(158), MFP_PULL_DISABLE},
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