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drivers: pinctrl: rcar: Rework pin configuration

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Rework pin configuration to meet documented procedures.
3 procedures are covered here:
  - GPIO -> Peripheral (+select peripheral function)
  - Peripheral -> GPIO
  - Change from Peripheral function 1 -> Peripheral function 2

Signed-off-by: Aymeric Aillet <aymeric.aillet@iot.bzh>
This commit is contained in:
Aymeric Aillet 2022-01-24 15:24:02 +01:00 • committed by Marti Bolivar
commit 732f829f69
1 changed files with 15 additions and 7 deletions
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22
drivers/pinctrl/pfc_rcar.c
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@ -166,19 +166,27 @@ int pinctrl_configure_pin(const pinctrl_soc_pin_t *pin)
{
int ret = 0;
/* Some pins cannot be used as GPIO */
/* Set pin as GPIO if capable */
if (RCAR_IS_GP_PIN(pin->pin)) {
pfc_rcar_set_gpsr(pin->pin, true);
pfc_rcar_set_gpsr(pin->pin, false);
} else if ((pin->flags & RCAR_PIN_FLAGS_FUNC_SET) == 0U) {
/* A function must be set for non GPIO capable pin */
return -EINVAL;
}
/* Select function for pin */
if ((pin->flags & RCAR_PIN_FLAGS_FUNC_SET) != 0U) {
pfc_rcar_set_ipsr(&pin->func);
}
if ((pin->flags & RCAR_PIN_FLAGS_PULL_SET) != 0U) {
ret = pfc_rcar_set_bias(pin->pin, pin->flags);
if (ret < 0) {
return ret;
if (RCAR_IS_GP_PIN(pin->pin)) {
pfc_rcar_set_gpsr(pin->pin, true);
}
if ((pin->flags & RCAR_PIN_FLAGS_PULL_SET) != 0U) {
ret = pfc_rcar_set_bias(pin->pin, pin->flags);
if (ret < 0) {
return ret;
}
}
}