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| author | Simon Glass <sjg@chromium.org> | 2020-07-07 13:11:48 -0600 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2020-07-17 14:32:24 +0800 |
| commit | 31e1787ec15e4a498e940e9ba24b625ca059a3b2 (patch) | |
| tree | 46143d89aa1acaf4b2081384ea0540823cd096ca /include/acpi | |
| parent | 4ebc940b39b6a43de9d1fa74653321cd6fdb4d3a (diff) | |
| download | u-boot-31e1787ec15e4a498e940e9ba24b625ca059a3b2.zip u-boot-31e1787ec15e4a498e940e9ba24b625ca059a3b2.tar.gz u-boot-31e1787ec15e4a498e940e9ba24b625ca059a3b2.tar.bz2 | |
acpi: Support generation of I2C descriptor
Add a function to write a GPIO descriptor to the generated ACPI code.
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>
Diffstat (limited to 'include/acpi')
| -rw-r--r-- | include/acpi/acpi_device.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/include/acpi/acpi_device.h b/include/acpi/acpi_device.h index 67a242e..7a65dad 100644 --- a/include/acpi/acpi_device.h +++ b/include/acpi/acpi_device.h @@ -9,6 +9,7 @@ #ifndef __ACPI_DEVICE_H #define __ACPI_DEVICE_H +#include <i2c.h> #include <linux/bitops.h> struct acpi_ctx; @@ -183,6 +184,26 @@ struct acpi_gpio { enum acpi_gpio_polarity polarity; }; +/* ACPI Descriptors for Serial Bus interfaces */ +#define ACPI_SERIAL_BUS_TYPE_I2C 1 +#define ACPI_I2C_SERIAL_BUS_REVISION_ID 1 /* TODO: upgrade to 2 */ +#define ACPI_I2C_TYPE_SPECIFIC_REVISION_ID 1 + +/** + * struct acpi_i2c - representation of an ACPI I2C device + * + * @address: 7-bit or 10-bit I2C address + * @mode_10bit: Which address size is used + * @speed: Bus speed in Hz + * @resource: Resource name for the I2C controller + */ +struct acpi_i2c { + u16 address; + enum i2c_address_mode mode_10bit; + enum i2c_speed_rate speed; + const char *resource; +}; + /** * acpi_device_path() - Get the full path to an ACPI device * @@ -270,4 +291,16 @@ int acpi_device_write_gpio_desc(struct acpi_ctx *ctx, int acpi_device_write_interrupt_or_gpio(struct acpi_ctx *ctx, struct udevice *dev, const char *prop); +/** + * acpi_device_write_i2c_dev() - Write an I2C device to ACPI + * + * This creates a I2cSerialBus descriptor for an I2C device, including + * information ACPI needs to use it. + * + * @ctx: ACPI context pointer + * @dev: I2C device to write + * @return I2C address of device if OK, -ve on error + */ +int acpi_device_write_i2c_dev(struct acpi_ctx *ctx, const struct udevice *dev); + #endif |