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acpi: Support generation of a GPIO/irq for a device

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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>
This commit is contained in:
Simon Glass
2020-07-07 13:11:47 -06:00
committed by Bin Meng
parent a9e0a077df
commit 4ebc940b39
3 changed files with 86 additions and 1 deletions
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15
include/acpi/acpi_device.h
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@@ -255,4 +255,19 @@ int acpi_device_write_gpio(struct acpi_ctx *ctx, const struct acpi_gpio *gpio);
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