Commit b41ba2ec authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Bartosz Golaszewski

gpiolib: Read "gpio-line-names" from a firmware node

On STM32MP1, the GPIO banks are subnodes of pin-controller@50002000,
see arch/arm/boot/dts/stm32mp151.dtsi. The driver for
pin-controller@50002000 is in drivers/pinctrl/stm32/pinctrl-stm32.c
and iterates over all of its DT subnodes when registering each GPIO
bank gpiochip. Each gpiochip has:

  - gpio_chip.parent = dev,
    where dev is the device node of the pin controller
  - gpio_chip.of_node = np,
    which is the OF node of the GPIO bank

Therefore, dev_fwnode(chip->parent) != of_fwnode_handle(chip.of_node),
i.e. pin-controller@50002000 != pin-controller@50002000/gpio@5000*000.

The original code behaved correctly, as it extracted the "gpio-line-names"
from of_fwnode_handle(chip.of_node) = pin-controller@50002000/gpio@5000*000.

To achieve the same behaviour, read property from the firmware node.

Fixes: 7cba1a4d ("gpiolib: generalize devprop_gpiochip_set_names() for device properties")
Reported-by: default avatarMarek Vasut <marex@denx.de>
Reported-by: default avatarRoman Guskov <rguskov@dh-electronics.com>
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: default avatarMarek Vasut <marex@denx.de>
Reviewed-by: default avatarMarek Vasut <marex@denx.de>
Signed-off-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
parent eb441337
......@@ -367,22 +367,18 @@ static int gpiochip_set_desc_names(struct gpio_chip *gc)
*
* Looks for device property "gpio-line-names" and if it exists assigns
* GPIO line names for the chip. The memory allocated for the assigned
* names belong to the underlying software node and should not be released
* names belong to the underlying firmware node and should not be released
* by the caller.
*/
static int devprop_gpiochip_set_names(struct gpio_chip *chip)
{
struct gpio_device *gdev = chip->gpiodev;
struct device *dev = chip->parent;
struct fwnode_handle *fwnode = dev_fwnode(&gdev->dev);
const char **names;
int ret, i;
int count;
/* GPIO chip may not have a parent device whose properties we inspect. */
if (!dev)
return 0;
count = device_property_string_array_count(dev, "gpio-line-names");
count = fwnode_property_string_array_count(fwnode, "gpio-line-names");
if (count < 0)
return 0;
......@@ -396,7 +392,7 @@ static int devprop_gpiochip_set_names(struct gpio_chip *chip)
if (!names)
return -ENOMEM;
ret = device_property_read_string_array(dev, "gpio-line-names",
ret = fwnode_property_read_string_array(fwnode, "gpio-line-names",
names, count);
if (ret < 0) {
dev_warn(&gdev->dev, "failed to read GPIO line names\n");
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment