diff options
Diffstat (limited to 'Documentation/gpio')
| -rw-r--r-- | Documentation/gpio/driver.txt | 6 |
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) |