Problem reading imx7ulp uboot gpio input value

sjkim — Thu, 21 Jul 2022 11:13:49 GMT

I want to read gpio input value from u-boot.

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static iomux_cfg_t const_board_pad[] = {
MX7ULP_PAD_PTE6__PTE6 | MUX_PAD_CTRL(PAD_CTL_IBE_ENABLE),
MX7ULP_PAD_PTE7__PTE7 | MUX_PAD_CTRL(PAD_CTL_IBE_ENABLE),
MX7ULP_PAD_PTE10__PTE10 | MUX_PAD_CTRL(PAD_CTL_IBE_ENABLE),
MX7ULP_PAD_PTE11__PTE11 | MUX_PAD_CTRL(PAD_CTL_IBE_ENABLE),
};

int show_hardware_version(void);

#define HW0_GPIO IMX_GPIO_NR(5, 7)
#define HW1_GPIO IMX_GPIO_NR(5, 6)
#define HW2_GPIO IMX_GPIO_NR(5, 10)
#define HW3_GPIO IMX_GPIO_NR(5, 11)

mx7ulp_iomux_setup_multiple_pads(const_board_pad, ARRAY_SIZE(const_board_pad));
if (gpio_request(HW0_GPIO, "hw0"))
printf("request error hw0\n");
if (gpio_request(HW1_GPIO, "hw1"))
printf("request error hw1\n");
if (gpio_request(HW2_GPIO, "hw2"))
printf("request error hw2\n");
if (gpio_request(HW3_GPIO, "hw3"))
printf("request error hw3\n");

gpio_direction_input(HW0_GPIO);
gpio_direction_input(HW1_GPIO);
gpio_direction_input(HW2_GPIO);
gpio_direction_input(HW3_GPIO);

hw_pin[0] = gpio_get_value(HW0_GPIO);
hw_pin[1] = gpio_get_value(HW1_GPIO);
hw_pin[2] = gpio_get_value(HW2_GPIO);
hw_pin[3] = gpio_get_value(HW3_GPIO);

printf("####################### %d %d %d %d\n", hw_pin[0], hw_pin[1], hw_pin[2], hw_pin[3]);

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PMC_1V8 pull up is applied to MX7ULP_PAD_PTE6__PTE 6 pin.

However, all gpio values are displayed as 0 .
The scope shows 1.8v high, but the value doesn't change.

Conversely, after setting the output, it was confirmed that it is controlled.

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md 40AC0118 1

40ac0118: 00010100

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I checked the registry value in u boot and there was no problem.

But when I read the values below, there is no change.

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md 400f0090 1

400f0090: 00000000

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I tried to read the value in various ways, but it didn't solve the problem.

Can you tell me how to solve it?

i.MX ProcessorsのトピックProblem reading imx7ulp uboot gpio input value

Problem reading imx7ulp uboot gpio input value