linux-kernel - Re: [PATCH v6 2/5] i2c: core: add api to provide frequency mode strings

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Date:   Tue, 6 Apr 2021 21:54:14 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Yicong Yang <yangyicong@...ilicon.com>
Cc:     andriy.shevchenko@...ux.intel.com, linux-i2c@...r.kernel.org,
        Sergey.Semin@...kalelectronics.ru, linux-kernel@...r.kernel.org,
        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, prime.zeng@...wei.com,
        linuxarm@...wei.com
Subject: Re: [PATCH v6 2/5] i2c: core: add api to provide frequency mode
 strings


> 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";
> +	}
> +}

Any reason ehy this is an inline function? My gut feeling says it would
be better added to the core?


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