diff options
| author | Duncan Laurie <dlaurie@chromium.org> | 2016-06-29 10:47:22 -0700 |
|---|---|---|
| committer | Duncan Laurie <dlaurie@chromium.org> | 2016-07-02 01:18:53 +0200 |
| commit | 5b6c28c43dee455b643e13d7f0debd79835a5f50 (patch) | |
| tree | 03651a1be906565bd9b00457e936f612db4361bf /src/include/gpio.h | |
| parent | d48d5a626b02e28ab6949263dad85abe92f9214c (diff) | |
| download | coreboot-5b6c28c43dee455b643e13d7f0debd79835a5f50.tar.xz | |
gpio: Add support for translating gpio_t into ACPI pin
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>
Diffstat (limited to 'src/include/gpio.h')
| -rw-r--r-- | src/include/gpio.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/include/gpio.h b/src/include/gpio.h index 3f462df295..69a0828f58 100644 --- a/src/include/gpio.h +++ b/src/include/gpio.h @@ -41,6 +41,16 @@ int _gpio_base3_value(gpio_t gpio[], int num_gpio, int binary_first); const char *gpio_acpi_path(gpio_t gpio); /* + * This function may be implemented by SoC/board code to provide + * a mapping from the internal representation of a GPIO to the 16bit + * value used in an ACPI GPIO pin table entry. + * + * If not implemented by the SOC the default handler will return 0 + * because the underlying type of gpio_t is unknown. + */ +uint16_t gpio_acpi_pin(gpio_t gpio); + +/* * Read the value presented by the set of GPIOs, when each pin is interpreted * as a base-2 digit (LOW = 0, HIGH = 1). * |