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drivers: pinctrl_nrf: Configure QSPI CSN pin as output set high

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... so that the pin keeps the inactive state of the CSN line when it is
not controlled by the QSPI peripheral and the driver is not suspended.

Currently, the nrf_qspi_nor shim deinitializes the nrfx_qspi driver
after each operation, what leaves the pin uncontrolled until a new
operation is requested (and the nrfx_qspi driver is initialized again)
or the driver is suspended (and the pin is put into low-power state).
This can cause the flash chip to needlessly consume current when there
is no pull-up resistor on its CSN line and the line appears active.
Prevent this by keeping the pin in a defined (inactive) state.

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
This commit is contained in:
Andrzej Głąbek 2022-09-19 13:34:46 +02:00 committed by Carles Cufí
parent acd847c527
commit 6d8172f4e9
1 changed files with 2 additions and 1 deletions
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3
drivers/pinctrl/pinctrl_nrf.c
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@ -289,7 +289,8 @@ int pinctrl_configure_pins(const pinctrl_soc_pin_t *pins, uint8_t pin_cnt,
break;
case NRF_FUN_QSPI_CSN:
NRF_PSEL_QSPI(reg, CSN) = pin;
dir = NRF_GPIO_PIN_DIR_INPUT;
write = 1U;
dir = NRF_GPIO_PIN_DIR_OUTPUT;
input = NRF_GPIO_PIN_INPUT_DISCONNECT;
break;
case NRF_FUN_QSPI_IO0: