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authorKarthikeyan Ramasubramanian <kramasub@google.com>2020-10-05 10:44:50 -0600
committerPatrick Georgi <pgeorgi@google.com>2020-10-14 05:43:00 +0000
commit685dbe14e93104847f2a3b885d58aef4f8e67192 (patch)
treef0b5550b8fb585876e94dc07c379af120e931d0a /src/include
parentae763de649d7d8ebcc00f2e6792b37c4766e1047 (diff)
downloadcoreboot-685dbe14e93104847f2a3b885d58aef4f8e67192.tar.xz
acpi/device: Add GPIO binding property for an array of GPIOs
This change is required for use-cases like GPIO based I2C multiplexer where more than one GPIOs are used as select lines. BUG=b:169444894 TEST=Build and boot waddledee to OS. Ensure that the GPIO bindings for an array of GPIOs are added to the ACPI table as follows: Device (MUX0) { ... Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings { GpioIo (Exclusive, PullDefault, 0x0000, 0x0000, IoRestrictionOutputOnly, "\\_SB.PCI0.GPIO", 0x00, ResourceConsumer, , ) { // Pin list 0x0125 } GpioIo (Exclusive, PullDefault, 0x0000, 0x0000, IoRestrictionOutputOnly, "\\_SB.PCI0.GPIO", 0x00, ResourceConsumer, , ) { // Pin list 0x0126 } }) Name (_DSD, Package (0x02) // _DSD: Device-Specific Data { ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301") /* Device Properties for _DSD */, Package (0x01) { Package (0x02) { "mux-gpios", Package (0x08) { \_SB.PCI0.I2C3.MUX0, Zero, Zero, Zero, \_SB.PCI0.I2C3.MUX0, One, Zero, Zero } } } }) } Change-Id: I7c6cc36b1bfca2d48c84f169e6b43fd4be8ba330 Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/46056 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com>
Diffstat (limited to 'src/include')
-rw-r--r--src/include/acpi/acpi_device.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/src/include/acpi/acpi_device.h b/src/include/acpi/acpi_device.h
index be13bd7ec8..301f9b0156 100644
--- a/src/include/acpi/acpi_device.h
+++ b/src/include/acpi/acpi_device.h
@@ -545,6 +545,22 @@ struct acpi_dp *acpi_dp_add_gpio(struct acpi_dp *dp, const char *name,
const char *ref, int index, int pin,
int active_low);
+struct acpi_gpio_res_params {
+ /* Reference to the parent device. */
+ const char *ref;
+ /* Index to the GpioIo resource within the _CRS. */
+ int index;
+ /* Index to the pin within the GpioIo resource, usually 0. */
+ int pin;
+ /* Flag to indicate if pin is active low. */
+ int active_low;
+};
+
+/* Add a GPIO binding device property for array of GPIOs */
+struct acpi_dp *acpi_dp_add_gpio_array(struct acpi_dp *dp, const char *name,
+ const struct acpi_gpio_res_params *params,
+ size_t param_count);
+
/* Add a child table of Device Properties */
struct acpi_dp *acpi_dp_add_child(struct acpi_dp *dp, const char *name,
struct acpi_dp *child);