Commit 3b4c747c authored by Yicong Yang's avatar Yicong Yang Committed by Wolfram Sang
Browse files

i2c: core: add api to provide frequency mode strings 



Some I2C drivers like Designware and HiSilicon will print the
bus frequency mode information, so add a public one that everyone
can make use of.

Tested-by: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarYicong Yang <yangyicong@hisilicon.com>
Signed-off-by: default avatarWolfram Sang <wsa@kernel.org>
parent 07740c92

drivers/i2c/i2c-core-base.c

+21 −0
Original line number Diff line number Diff line
@@ -76,6 +76,27 @@ 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)

{

include/linux/i2c.h

+3 −0
Original line number Diff line number Diff line
@@ -51,6 +51,9 @@ 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