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: 7cba1a4d5e162 ("gpiolib: generalize devprop_gpiochip_set_names() for device properties")
Reported-by: Marek Vasut <marex@denx.de>
Reported-by: Roman Guskov <rguskov@dh-electronics.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Marek Vasut <marex@denx.de>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 4253837..7ec0822 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -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");