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@xxxxxxxxxxxxxxx>
Reviewed-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Yicong Yang <yangyicong@xxxxxxxxxxxxx>
---
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 de9402c..775b8cc 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 10bd0b0..0813be1 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
--
2.8.1
