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i2c: designware_i2c: Support ACPI table generation

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Update the PCI driver to generate ACPI information so that Linux has the
full information about each I2C bus.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
[bmeng: Correct one typo in dw_i2c_gen_speed_config() comments]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2020-07-07 21:32:29 -06:00
committed by Bin Meng
parent c61c8efd47
commit 4b0ec52b9e
3 changed files with 136 additions and 1 deletions
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15
drivers/i2c/designware_i2c.h
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@@ -205,6 +205,7 @@ struct dw_i2c {
#if CONFIG_IS_ENABLED(CLK)
struct clk clk;
#endif
struct dw_i2c_speed_config config;
};
extern const struct dm_i2c_ops designware_i2c_ops;
@@ -213,4 +214,18 @@ int designware_i2c_probe(struct udevice *bus);
int designware_i2c_remove(struct udevice *dev);
int designware_i2c_ofdata_to_platdata(struct udevice *bus);
/**
* dw_i2c_gen_speed_config() - Calculate config info from requested speed
*
* Calculate the speed config from the given @speed_hz and return it so that
* it can be incorporated in ACPI tables
*
* @dev: I2C bus to check
* @speed_hz: Requested speed in Hz
* @config: Returns config to use for that speed
* @return 0 if OK, -ve on error
*/
int dw_i2c_gen_speed_config(const struct udevice *dev, int speed_hz,
struct dw_i2c_speed_config *config);
#endif /* __DW_I2C_H_ */