The conflict problem of Linux imx6 gpio_request

Imx6q for C20 write Gpio driver, in the upper layer call open () function always error, return-1.

After parsing the Gpio_request function, and looking for IMX_GPIO_NR (1, 17) in BOARD-MX6Q_SABRESD.C

Definition, found two definitions, (1, 17) and was used in Mx6_sabresd_board_init ().

" Ft5x06-rst ")

Since the PIN is a dedicated pin in the printed PCB board, the statement is commented out in the kernel, and the kernel is re-burned, then the test is OK.

The experiment proves that the gpio_request can only be used once, when the gpio_request of the same address is called in other places, the error is returned-1,

It means that the address has been applied. There should be an address Occupancy table description in/proc/mem.

The conflict problem of Linux imx6 gpio_request