diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 41188f51572197cea91bc9b9eb4194b979891bca..845ca99f0614f924620d8191b464d0766c4a037d 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 fc372dce603ea5c3e6b626e2fb5d3485752f8645..e26bd27a749c27a15f5926e603585491f08ca0cf 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