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i2c: add generic routine to parse DT for timing information

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Inspired from the i2c-rk3x driver (thanks guys!) but refactored and
extended. See built-in docs for further information.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2015-12-08 10:37:46 +01:00 • committed by Wolfram Sang
parent 99b809d7bd
commit e1dba01ca6
2 changed files with 71 additions and 0 deletions
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18
include/linux/i2c.h
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@ -413,6 +413,22 @@ struct i2c_algorithm {
#endif
};
/**
* struct i2c_timings - I2C timing information
* @bus_freq_hz: the bus frequency in Hz
* @scl_rise_ns: time SCL signal takes to rise in ns; t(r) in the I2C specification
* @scl_fall_ns: time SCL signal takes to fall in ns; t(f) in the I2C specification
* @scl_int_delay_ns: time IP core additionally needs to setup SCL in ns
* @sda_fall_ns: time SDA signal takes to fall in ns; t(f) in the I2C specification
*/
struct i2c_timings {
u32 bus_freq_hz;
u32 scl_rise_ns;
u32 scl_fall_ns;
u32 scl_int_delay_ns;
u32 sda_fall_ns;
};
/**
* struct i2c_bus_recovery_info - I2C bus recovery information
* @recover_bus: Recover routine. Either pass driver's recover_bus() routine, or
@ -604,6 +620,7 @@ extern void i2c_clients_command(struct i2c_adapter *adap,
extern struct i2c_adapter *i2c_get_adapter(int nr);
extern void i2c_put_adapter(struct i2c_adapter *adap);
void i2c_parse_fw_timings(struct device *dev, struct i2c_timings *t, bool use_defaults);
/* Return the functionality mask */
static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
@ -660,6 +677,7 @@ extern struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
/* must call i2c_put_adapter() when done with returned i2c_adapter device */
struct i2c_adapter *of_get_i2c_adapter_by_node(struct device_node *node);
#else
static inline struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)