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Software nodes allow us to represent hierarchies for device components
that don't have their struct device representation yet - for instance:
banks of GPIOs under a common GPIO expander. The core gpiolib core
however doesn't offer any way of passing this information from the
drivers.
This extends struct gpio_chip with a pointer to fwnode that can be set
by the driver and used to pass device properties for child nodes.
This is similar to how we handle device-tree sub-nodes with
CONFIG_OF_GPIO enabled.
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
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