[PATCH v5 2/5] i2c: core: add api to provide frequency mode strings

Yicong Yang
2021-03-30T14:23:07Z

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.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
---
include/linux/i2c.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 10bd0b0..6837e64 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(100KHz)";
+ case I2C_MAX_FAST_MODE_FREQ:
+ return "Fast Mode(400KHz)";
+ case I2C_MAX_FAST_MODE_PLUS_FREQ:
+ return "Fast Mode Plus(1.0MHz)";
+ case I2C_MAX_TURBO_MODE_FREQ:
+ return "Turbo Mode(1.4MHz)";
+ case I2C_MAX_HIGH_SPEED_MODE_FREQ:
+ return "High Speed Mode(3.4MHz)";
+ case I2C_MAX_ULTRA_FAST_MODE_FREQ:
+ return "Ultra Fast Mode(5.0MHz)";
+ default:
+ return "Unknown Mode";
+ }
+}
+
struct module;
struct property_entry;

--
2.8.1