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authorWolfram Sang <wsa+renesas@sang-engineering.com>2015-12-08 12:37:46 +0300
committerWolfram Sang <wsa@the-dreams.de>2015-12-14 12:51:07 +0300
commite1dba01ca620bb0b3864d5237c1c597d9e012ebf (patch)
tree44b4a1e51fbb14fc803f2cbd18a13c0509eda207 /include/linux/i2c.h
parent99b809d7bdd17de7a68f1625a8973052c8311657 (diff)
downloadlinux-e1dba01ca620bb0b3864d5237c1c597d9e012ebf.tar.xz
i2c: add generic routine to parse DT for timing information
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>
Diffstat (limited to 'include/linux/i2c.h')
-rw-r--r--include/linux/i2c.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 51028f351d13..bc2b19ad9357 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -414,6 +414,22 @@ struct i2c_algorithm {
};
/**
+ * 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
* i2c_generic_scl_recovery() or i2c_generic_gpio_recovery().
@@ -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)