Commit 6dc9b455 authored by Laurent Pinchart's avatar Laurent Pinchart

sh-pfc: Return an error if a pin doesn't support the requested direction

When setting a pin direction verify that the requested direction is
supported, and return an error if it isn't.

This requires pin configuration information to be supplied by SoC data.
The check is a no-op if the information is not supplied.
Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 9a643c9a
......@@ -218,8 +218,18 @@ static int sh_pfc_gpio_set_direction(struct pinctrl_dev *pctldev,
const struct sh_pfc_pin *pin = &pfc->info->pins[idx];
struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
unsigned long flags;
unsigned int dir;
int ret;
/* Check if the requested direction is supported by the pin. Not all SoC
* provide pin config data, so perform the check conditionally.
*/
if (pin->configs) {
dir = input ? SH_PFC_PIN_CFG_INPUT : SH_PFC_PIN_CFG_OUTPUT;
if (!(pin->configs & dir))
return -EINVAL;
}
spin_lock_irqsave(&pfc->lock, flags);
ret = sh_pfc_config_mux(pfc, pin->enum_id, new_type);
......
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