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gpio: Add support for translating gpio_t into ACPI pin

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Add a function for an SOC to define that will allow it to map the
SOC-specific gpio_t value into an appropriate ACPI pin.  The exact
behavior depends on the GPIO implementation in the SOC, but it can
be used to provide a pin number that is relative to the community or
bank that a GPIO resides in.

Change-Id: Icb97ccf7d6a9034877614d49166bc9e4fe659bcf
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/15512
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Duncan Laurie
2016-06-29 10:47:22 -07:00
parent d48d5a626b
commit 5b6c28c43d
3 changed files with 23 additions and 2 deletions
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9
src/arch/x86/acpi_device.c
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@@ -314,8 +314,13 @@ void acpi_device_write_gpio(const struct acpi_gpio *gpio)
acpi_device_fill_from_len(pin_table_offset, start);
/* Pin Table, one word for each pin */
for (pin = 0; pin < gpio->pin_count; pin++)
acpigen_emit_word(gpio->pins[pin]);
for (pin = 0; pin < gpio->pin_count; pin++) {
uint16_t acpi_pin = gpio->pins[pin];
#if IS_ENABLED(CONFIG_GENERIC_GPIO_LIB)
acpi_pin = gpio_acpi_pin(acpi_pin);
#endif
acpigen_emit_word(acpi_pin);
}
/* Fill in Resource Source Name Offset */
acpi_device_fill_from_len(resource_offset, start);