From: Yicong Yang yangyicong@hisilicon.com
mainline inclusion from mainline-v5.12-rc7 3b4c747cd32078172dd238929e38a43cfed83580 category: feature bugzilla: 175140 CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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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.
Add the definition of the I2C Frequency Modes macro.
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 Reviewed-by: Jay Fang f.fangjian@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/i2c/i2c-core-base.c | 21 +++++++++++++++++++++ include/linux/i2c.h | 3 +++ 2 files changed, 24 insertions(+)
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index e4568a236521..0c4b0e726d6c 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -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) { diff --git a/include/linux/i2c.h b/include/linux/i2c.h index e3e3fd41ba98..75b42c72d454 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -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