> diff --git a/include/linux/i2c.h b/include/linux/i2c.h
> index 10bd0b0..7268180 100644
> --- a/include/linux/i2c.h
> +++ b/include/linux/i2c.h
> @@ -47,6 +47,26 @@ typedef int (*i2c_slave_cb_t)(struct i2c_client *client,
>  #define I2C_MAX_HIGH_SPEED_MODE_FREQ	3400000
>  #define I2C_MAX_ULTRA_FAST_MODE_FREQ	5000000
>  
> +static inline 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";
> +	}
> +}

Any reason ehy this is an inline function? My gut feeling says it would
be better added to the core?