From 685dbe14e93104847f2a3b885d58aef4f8e67192 Mon Sep 17 00:00:00 2001 From: Karthikeyan Ramasubramanian Date: Mon, 5 Oct 2020 10:44:50 -0600 Subject: 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 Reviewed-on: https://review.coreboot.org/c/coreboot/+/46056 Tested-by: build bot (Jenkins) Reviewed-by: Furquan Shaikh --- src/include/acpi/acpi_device.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'src/include/acpi') 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); -- cgit v1.2.3