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From:   Yicong Yang <yangyicong@hisilicon.com>
To:     <wsa@kernel.org>, <andriy.shevchenko@linux.intel.com>,
        <linux-i2c@vger.kernel.org>, <Sergey.Semin@baikalelectronics.ru>,
        <linux-kernel@vger.kernel.org>
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        <jarkko.nikula@linux.intel.com>, <rmk+kernel@armlinux.org.uk>,
        <song.bao.hua@hisilicon.com>, <john.garry@huawei.com>,
        <mika.westerberg@linux.intel.com>, <yangyicong@hisilicon.com>,
        <prime.zeng@huawei.com>, <linuxarm@huawei.com>
Subject: [PATCH v6 2/5] i2c: core: add api to provide frequency mode strings
Date:   Wed, 31 Mar 2021 21:36:27 +0800
Message-ID: <1617197790-30627-3-git-send-email-yangyicong@hisilicon.com>
In-Reply-To: <1617197790-30627-1-git-send-email-yangyicong@hisilicon.com>
References: <1617197790-30627-1-git-send-email-yangyicong@hisilicon.com>
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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.

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>
---
 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