imx6ull的NAND_DQS引脚使用

[1070800554]

针对MCIMX6G3CVM05AA芯片，将nand配置为Asynchronous Mode使用，不占用AND_DQS引脚，

1、上述情况下，AND_DQS引脚能否作为普通GPIO使用？最好是用作中断。

2、上述情况下，测得AND_DQS引脚一直为高电平，为什么？

[weidong_sun]

Hi Sun,

   Yes, it can be configured as GPIO, below is from reference manual.

It has been defined in "arch/arm/boot/dts/imx6ul-pinctrl.h",

#define MX6UL_PAD_NAND_DQS__GPIO4_IO16            0x01b8 0x0444 0x0000 5 0

You should add it to device tree .like imx6ull-14x14-evk.dts. see below, please!

&iomuxc {
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_hog_1>;
    pinctrl_hog_1: hoggrp-1 {
        fsl,pins = <
            MX6UL_PAD_UART1_RTS_B__GPIO1_IO19    0x17059 /* SD1 CD */
            MX6UL_PAD_GPIO1_IO05__USDHC1_VSELECT    0x17059 /* SD1 VSELECT */
            MX6UL_PAD_GPIO1_IO09__GPIO1_IO09        0x17059 /* SD1 RESET */

            MX6UL_PAD_NAND_DQS__GPIO4_IO16  0x17059
        >;
    };

Then on application level , you can operate it , detailed information can be obtained from internet. see the link, please!

https://blog.csdn.net/tiger99111/article/details/80940953 

Have an nice day!

BR,

Weidong