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Message-ID: <1617197790-30627-3-git-send-email-yangyicong@hisilicon.com>
Date: Wed, 31 Mar 2021 21:36:27 +0800
From: Yicong Yang <yangyicong@...ilicon.com>
To: <wsa@...nel.org>, <andriy.shevchenko@...ux.intel.com>,
<linux-i2c@...r.kernel.org>, <Sergey.Semin@...kalelectronics.ru>,
<linux-kernel@...r.kernel.org>
CC: <digetx@...il.com>, <treding@...dia.com>,
<jarkko.nikula@...ux.intel.com>, <rmk+kernel@...linux.org.uk>,
<song.bao.hua@...ilicon.com>, <john.garry@...wei.com>,
<mika.westerberg@...ux.intel.com>, <yangyicong@...ilicon.com>,
<prime.zeng@...wei.com>, <linuxarm@...wei.com>
Subject: [PATCH v6 2/5] i2c: core: add api to provide frequency mode strings
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@...ux.intel.com>
Reviewed-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Yicong Yang <yangyicong@...ilicon.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..7268180 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 (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";
+ }
+}
+
struct module;
struct property_entry;
--
2.8.1
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