diff options
| author | Simon Glass <sjg@chromium.org> | 2020-09-22 21:45:01 +0300 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2020-09-25 06:27:15 +0300 |
| commit | fd42f263cef9fd6bba9ded76a82d4ac66450e156 (patch) | |
| tree | 64bc139fe69c2d50a6200ccda1f1c521e45643b4 /include/acpi | |
| parent | bddbaf5edf0e01817f2577295c3d682e4d5fed09 (diff) | |
| download | u-boot-fd42f263cef9fd6bba9ded76a82d4ac66450e156.tar.xz | |
i2c: Add a generic driver to generate ACPI info
Many I2C devices produce roughly the same ACPI data with just things like
the GPIO/interrupt information being different.
This can be handled by a generic driver along with some information in the
device tree.
Add a generic i2c driver for this purpose.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
Diffstat (limited to 'include/acpi')
| -rw-r--r-- | include/acpi/acpi_device.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/include/acpi/acpi_device.h b/include/acpi/acpi_device.h index a5b1221782..1b838fcb85 100644 --- a/include/acpi/acpi_device.h +++ b/include/acpi/acpi_device.h @@ -10,7 +10,9 @@ #define __ACPI_DEVICE_H #include <i2c.h> +#include <irq.h> #include <spi.h> +#include <asm-generic/gpio.h> #include <linux/bitops.h> struct acpi_ctx; @@ -236,6 +238,59 @@ struct acpi_spi { }; /** + * struct acpi_i2c_priv - Information read from device tree + * + * This is used by devices which want to specify various pieces of ACPI + * information, including power control. It allows a generic function to + * generate the information for ACPI, based on device-tree properties. + * + * @disable_gpio_export_in_crs: Don't export GPIOs in the CRS + * @reset_gpio: GPIO used to assert reset to the device + * @enable_gpio: GPIO used to enable the device + * @stop_gpio: GPIO used to stop the device + * @irq_gpio: GPIO used for interrupt (if @irq is not used) + * @irq: IRQ used for interrupt (if @irq_gpio is not used) + * @hid: _HID value for device (required) + * @uid: _UID value for device + * @desc: _DDN value for device + * @wake: Wake event, e.g. GPE0_DW1_15; 0 if none + * @property_count: Number of other DSD properties (currently always 0) + * @probed: true set set 'linux,probed' property + * @compat_string: Device tree compatible string to report through ACPI + * @has_power_resource: true if this device has a power resource + * @reset_delay_ms: Delay after de-asserting reset, in ms + * @reset_off_delay_ms: Delay after asserting reset (during power off) + * @enable_delay_ms: Delay after asserting enable + * @enable_off_delay_ms: Delay after de-asserting enable (during power off) + * @stop_delay_ms: Delay after de-aserting stop + * @stop_off_delay_ms: Delay after asserting stop (during power off) + * @hid_desc_reg_offset: HID register offset (for Human Interface Devices) + */ +struct acpi_i2c_priv { + bool disable_gpio_export_in_crs; + struct gpio_desc reset_gpio; + struct gpio_desc enable_gpio; + struct gpio_desc irq_gpio; + struct gpio_desc stop_gpio; + struct irq irq; + const char *hid; + u32 uid; + const char *desc; + u32 wake; + u32 property_count; + bool probed; + const char *compat_string; + bool has_power_resource; + u32 reset_delay_ms; + u32 reset_off_delay_ms; + u32 enable_delay_ms; + u32 enable_off_delay_ms; + u32 stop_delay_ms; + u32 stop_off_delay_ms; + u32 hid_desc_reg_offset; +}; + +/** * acpi_device_path() - Get the full path to an ACPI device * * This gets the full path in the form XXXX.YYYY.ZZZZ where XXXX is the root |