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i2c: core: add api to provide frequency mode strings

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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: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Yicong Yang 2021-04-08 19:17:18 +08:00 committed by Wolfram Sang
parent 07740c92ae
commit 3b4c747cd3
2 changed files with 24 additions and 0 deletions
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21
drivers/i2c/i2c-core-base.c
View File

@ -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)
{

3
include/linux/i2c.h
View File

@ -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