diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index fd440995b8bd021e2f9805e13bf6606ccdf9af1c..540c77e04ad27a4196bf8f5b93e61ce1c7aa7a0b 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -84,6 +84,27 @@ void i2c_transfer_trace_unreg(void) static_branch_dec(&i2c_trace_msg_key); } +const char *i2c_freq_mode_string(u32 bus_freq_hz) +{ + switch (bus_freq_hz) { + case I2C_MAX_STANDARD_MODE_FREQ: + return "Standard Mode (100 kHz)"; + case I2C_MAX_FAST_MODE_FREQ: + return "Fast Mode (400 kHz)"; + case I2C_MAX_FAST_MODE_PLUS_FREQ: + return "Fast Mode Plus (1.0 MHz)"; + case I2C_MAX_TURBO_MODE_FREQ: + return "Turbo Mode (1.4 MHz)"; + case I2C_MAX_HIGH_SPEED_MODE_FREQ: + return "High Speed Mode (3.4 MHz)"; + case I2C_MAX_ULTRA_FAST_MODE_FREQ: + return "Ultra Fast Mode (5.0 MHz)"; + default: + return "Unknown Mode"; + } +} +EXPORT_SYMBOL_GPL(i2c_freq_mode_string); + const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id, const struct i2c_client *client) { diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 99bffccb87bc3f19a16e91d2d8ecf76e023a9d5c..db39870e36580f12c6eb8207ff6bb74e7ce88ffc 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -53,10 +53,21 @@ struct i2c_board_info; enum i2c_slave_event; typedef int (*i2c_slave_cb_t)(struct i2c_client *, enum i2c_slave_event, u8 *); +/* I2C Frequency Modes */ +#define I2C_MAX_STANDARD_MODE_FREQ 100000 +#define I2C_MAX_FAST_MODE_FREQ 400000 +#define I2C_MAX_FAST_MODE_PLUS_FREQ 1000000 +#define I2C_MAX_TURBO_MODE_FREQ 1400000 +#define I2C_MAX_HIGH_SPEED_MODE_FREQ 3400000 +#define I2C_MAX_ULTRA_FAST_MODE_FREQ 5000000 + struct module; struct property_entry; #if IS_ENABLED(CONFIG_I2C) +/* Return the Frequency mode string based on the bus frequency */ +const char *i2c_freq_mode_string(u32 bus_freq_hz); + /* * The master routines are the ones normally used to transmit data to devices * on a bus (or read from them). Apart from two basic transfer functions to