acpi: Support generation of a GPIO/irq for a device
Some devices use interrupts but some use GPIOs. Since these are fully
specified in the device tree we can automatically produce the correct ACPI
descriptor for a device.
Add a function to handle this.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/acpi/acpi_device.h b/include/acpi/acpi_device.h
index 002e835..67a242e 100644
--- a/include/acpi/acpi_device.h
+++ b/include/acpi/acpi_device.h
@@ -255,4 +255,19 @@
int acpi_device_write_gpio_desc(struct acpi_ctx *ctx,
const struct gpio_desc *desc);
+/**
+ * acpi_device_write_interrupt_or_gpio() - Write interrupt or GPIO to ACPI
+ *
+ * This reads an interrupt from the device tree "interrupts-extended" property,
+ * if available. If not it reads the first GPIO with the name @prop.
+ *
+ * If an interrupt is found, an ACPI interrupt descriptor is written to the ACPI
+ * output. If not, but if a GPIO is found, a GPIO descriptor is written.
+ *
+ * @return irq or GPIO pin number if OK, -ve if neither an interrupt nor a GPIO
+ * could be found, or some other error occurred
+ */
+int acpi_device_write_interrupt_or_gpio(struct acpi_ctx *ctx,
+ struct udevice *dev, const char *prop);
+
#endif