From ac9c4569e6c789ad3a97bed5c88c31fa52b0db53 Mon Sep 17 00:00:00 2001 From: Yicong Yang Date: Fri, 30 Jul 2021 15:44:20 +0800 Subject: [PATCH] i2c: core: add api to provide frequency mode strings 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/?id=3b4c747cd32078172dd238929e38a43cfed83580 --------------------------- 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 Reviewed-by: Jarkko Nikula Reviewed-by: Andy Shevchenko Signed-off-by: Yicong Yang Signed-off-by: Wolfram Sang Reviewed-by: Jay Fang Signed-off-by: Zheng Zengkai --- 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 -- GitLab