From: Yicong Yang yangyicong@hisilicon.com
mainline inclusion from mainline-v5.13-rc1 commit 3b4c747cd32078172dd238929e38a43cfed83580 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I42E7E CVE: NA
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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 Signed-off-by: Jiaran Zhang zhangjiaran@huawei.com Reviewed-by: Sheng Feng < fengsheng5@huawei.com> Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/i2c/i2c-core-base.c | 21 +++++++++++++++++++++ include/linux/i2c.h | 11 +++++++++++ 2 files changed, 32 insertions(+)
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 41188f5157219..845ca99f0614f 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -84,6 +84,27 @@ 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 fc372dce603ea..e26bd27a749c2 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -53,10 +53,21 @@ struct i2c_board_info; enum i2c_slave_event; typedef int (*i2c_slave_cb_t)(struct i2c_client *, enum i2c_slave_event, u8 *);
+/* I2C Frequency Modes */ +#define I2C_MAX_STANDARD_MODE_FREQ 100000 +#define I2C_MAX_FAST_MODE_FREQ 400000 +#define I2C_MAX_FAST_MODE_PLUS_FREQ 1000000 +#define I2C_MAX_TURBO_MODE_FREQ 1400000 +#define I2C_MAX_HIGH_SPEED_MODE_FREQ 3400000 +#define I2C_MAX_ULTRA_FAST_MODE_FREQ 5000000 + 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