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-rw-r--r--Documentation/gpio/driver.txt6
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/gpio/driver.txt b/Documentation/gpio/driver.txt
index 18790c237977..31e0b5db55d8 100644
--- a/Documentation/gpio/driver.txt
+++ b/Documentation/gpio/driver.txt
@@ -124,7 +124,8 @@ symbol:
* gpiochip_set_chained_irqchip(): sets up a chained irq handler for a
gpio_chip from a parent IRQ and passes the struct gpio_chip* as handler
data. (Notice handler data, since the irqchip data is likely used by the
- parent irqchip!) This is for the chained type of chip.
+ parent irqchip!) This is for the chained type of chip. This is also used
+ to set up a nested irqchip if NULL is passed as handler.
To use the helpers please keep the following in mind:
@@ -178,7 +179,8 @@ does not help since it pins the module to the kernel forever (it calls
try_module_get()). A GPIO driver can use the following functions instead
to request and free descriptors without being pinned to the kernel forever.
- int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label)
+ struct gpio_desc *gpiochip_request_own_desc(struct gpio_desc *desc,
+ const char *label)
void gpiochip_free_own_desc(struct gpio_desc *desc)