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gpiolib: Assign fwnode to parent's if no primary one provided 

In case when the properties are supplied in the secondary fwnode
(for example, built-in device properties) the fwnode pointer left
unassigned. This makes unable to retrieve them.

Assign fwnode to parent's if no primary one provided.

Fixes: 7cba1a4d5e ("gpiolib: generalize devprop_gpiochip_set_names() for device properties")
Fixes: 2afa97e9868f ("gpiolib: Read "gpio-line-names" from a firmware node")
Reported-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Tested-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
rM2-mainline
Andy Shevchenko 2021-03-15 20:44:30 +02:00 committed by Bartosz Golaszewski
parent 3875721e82
commit 6cb59afe9e
1 changed files with 7 additions and 0 deletions
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7
drivers/gpio/gpiolib.c
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@ -571,6 +571,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
struct lock_class_key *lock_key,
struct lock_class_key *request_key)
{
struct fwnode_handle *fwnode = gc->parent ? dev_fwnode(gc->parent) : NULL;
unsigned long flags;
int ret = 0;
unsigned i;
@ -594,6 +595,12 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
of_gpio_dev_init(gc, gdev);
/*
* Assign fwnode depending on the result of the previous calls,
* if none of them succeed, assign it to the parent's one.
*/
gdev->dev.fwnode = dev_fwnode(&gdev->dev) ?: fwnode;
gdev->id = ida_alloc(&gpio_ida, GFP_KERNEL);
if (gdev->id < 0) {
ret = gdev->id;