can setting gpio input high/low on imx6q?

[linhsun]

Dear all , My board is sabresd_6dq (kernel 3.14.52),  can I setting gpio to input (Hi or Low) ? please get a little suggest. thank.

   P.S I set input after, but the gpio always low, I hope set input (high).

// code

func(..){

   int rc, gpio;
   struct device *dev = &pdev->dev;
   struct device_node *np = pdev->dev.of_node;

   gpio = of_get_named_gpio(np, "test-gpio", 0);
   if (gpio_is_valid(gpio)) {
      rc = devm_gpio_request_one(&pdev->dev, gpio, GPIOF_OUT_INIT_HIGH, "test gpio");
      if (rc) {
         dev_err(&pdev->dev, "unable to get test-gpio\n");
         goto error_request_gpio;
      }

#define INPUT

#ifdef INPUT
      mdelay(500);
      //set input
      gpio_direction_input(gpio);
      // setting gpio input
      int fault;

      fault = gpio_get_value(gpio);

#endif

   }

}

[igorpadykov]

Hi Lin

when gpio is set as input external device should provide
necessary high/low level to it. In general one can also configure
IOMUXC_SW_PAD_CTL_PAD_X_Y register for pull-up/down to maintain necessary level,
please check Chapter 36 IOMUX Controller (IOMUXC) i.MX6DQ Reference Manual
http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf

Best regards
igor
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[linhsun]

Dear igor

   Thank. I check register after, add register to dts. result: 1. set pull down is success 2. set pull up fail (voltage is 0.2 v), can you get me a little suggest. 

          P.S high should is 3.3v, but it is 0.2 v, please help me. thank.

// dts file

.......................

    imx6qdl-sabresd {

               .........................

                    fsl,pins = <

                                         ...........................

                                         MX6QDL_PAD_NANDF_CS3__GPIO6_IO16 0x80000000
                                         /* Baro int pull up( 0.2 v)*/
                                         MX6QDL_PAD_EIM_DA15__GPIO3_IO15 0x1b0b0
                                         /* Baro int pull down*/
                                        //MX6QDL_PAD_EIM_DA15__GPIO3_IO15 0x110b0 

                    >;