i2c: designware_i2c: Support ACPI table generation
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>
diff --git a/drivers/i2c/designware_i2c.h b/drivers/i2c/designware_i2c.h
index dc9a6cc..18acf4e 100644
--- a/drivers/i2c/designware_i2c.h
+++ b/drivers/i2c/designware_i2c.h
@@ -205,6 +205,7 @@
#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_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_ */