From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
Introduce `pin_requested` API to check if a pin is currently requested.
This API allows pinctrl drivers to verify whether a pin is requested or
not by checking if the pin is owned by either `gpio_owner` or `mux_owner`.
GPIO pins used as interrupts through the `interrupts` DT property do not
follow the usual `gpio_request`/`pin_request` path, unlike GPIO pins used
as interrupts via the `gpios` property. As a result, such pins were
reported as `UNCLAIMED` in the `pinmux-pins` sysfs file, even though they
were in use as interrupts.
With the newly introduced API, pinctrl drivers can check if a pin is
already requested by the pinctrl core and ensure that pin is requested
during when using as irq. This helps to ensure that the `pinmux-pins`
sysfs file reflects the correct status of the pin.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
---
drivers/pinctrl/pinmux.c | 14 ++++++++++++++
drivers/pinctrl/pinmux.h | 5 +++++
2 files changed, 19 insertions(+)
diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 02033ea1c643..6c3d18b162ad 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -99,6 +99,20 @@ bool pinmux_can_be_used_for_gpio(struct pinctrl_dev *pctldev, unsigned int pin)
return !(ops->strict && !!desc->gpio_owner);
}
+bool pin_requested(struct pinctrl_dev *pctldev, int pin)
+{
+ struct pin_desc *desc;
+
+ desc = pin_desc_get(pctldev, pin);
+ if (!desc)
+ return false;
+
+ if (!desc->gpio_owner && !desc->mux_owner)
+ return false;
+
+ return true;
+}
+
/**
* pin_request() - request a single pin to be muxed in, typically for GPIO
* @pctldev: the associated pin controller device
diff --git a/drivers/pinctrl/pinmux.h b/drivers/pinctrl/pinmux.h
index 2965ec20b77f..6d854eebaad4 100644
--- a/drivers/pinctrl/pinmux.h
+++ b/drivers/pinctrl/pinmux.h
@@ -42,6 +42,7 @@ int pinmux_map_to_setting(const struct pinctrl_map *map,
void pinmux_free_setting(const struct pinctrl_setting *setting);
int pinmux_enable_setting(const struct pinctrl_setting *setting);
void pinmux_disable_setting(const struct pinctrl_setting *setting);
+bool pin_requested(struct pinctrl_dev *pctldev, int pin);
#else
@@ -100,6 +101,10 @@ static inline void pinmux_disable_setting(const struct pinctrl_setting *setting)
{
}
+bool pin_requested(struct pinctrl_dev *pctldev, int pin)
+{
+ return false;
+}
#endif
#if defined(CONFIG_PINMUX) && defined(CONFIG_DEBUG_FS)
--
2.43.0
