diff options
Diffstat (limited to 'drivers/pinctrl/pinmux.c')
| -rw-r--r-- | drivers/pinctrl/pinmux.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c index 020e54f843f9..e914f6efd39e 100644 --- a/drivers/pinctrl/pinmux.c +++ b/drivers/pinctrl/pinmux.c @@ -71,6 +71,30 @@ int pinmux_validate_map(const struct pinctrl_map *map, int i) } /** + * pinmux_can_be_used_for_gpio() - check if a specific pin + * is either muxed to a different function or used as gpio. + * + * @pin: the pin number in the global pin space + * + * Controllers not defined as strict will always return true, + * menaning that the gpio can be used. + */ +bool pinmux_can_be_used_for_gpio(struct pinctrl_dev *pctldev, unsigned pin) +{ + struct pin_desc *desc = pin_desc_get(pctldev, pin); + const struct pinmux_ops *ops = pctldev->desc->pmxops; + + /* Can't inspect pin, assume it can be used */ + if (!desc) + return true; + + if (ops->strict && desc->mux_usecount) + return false; + + return !(ops->strict && !!desc->gpio_owner); +} + +/** * pin_request() - request a single pin to be muxed in, typically for GPIO * @pin: the pin number in the global pin space * @owner: a representation of the owner of this pin; typically the device |