linux-kernel - Re: [PATCH v2 11/13] clocksource: export the clocks_calc_mult

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Message-ID: <alpine.DEB.2.20.1611291008410.4358@nanos>
Date:   Tue, 29 Nov 2016 10:08:53 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Grygorii Strashko <grygorii.strashko@...com>
cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Mugunthan V N <mugunthanvnm@...com>,
        Richard Cochran <richardcochran@...il.com>,
        Sekhar Nori <nsekhar@...com>, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        devicetree@...r.kernel.org, Murali Karicheri <m-karicheri2@...com>,
        Wingman Kwok <w-kwok2@...com>,
        John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH v2 11/13] clocksource: export the clocks_calc_mult_shift
 to use by timestamp code

On Mon, 28 Nov 2016, Grygorii Strashko wrote:

> From: Murali Karicheri <m-karicheri2@...com>
> 
> The CPSW CPTS driver is capable of doing timestamping on tx/rx packets and
> requires to know mult and shift factors for timestamp conversion from raw
> value to nanoseconds (ptp clock). Now these mult and shift factors are
> calculated manually and provided through DT, which makes very hard to
> support of a lot number of platforms, especially if CPTS refclk is not the
> same for some kind of boards and depends on efuse settings (Keystone 2
> platforms). Hence, export clocks_calc_mult_shift() to allow drivers like
> CPSW CPTS (and other ptp drivesr) to benefit from automaitc calculation of
> mult and shift factors.
> 
> Cc: John Stultz <john.stultz@...aro.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

Acked-by: Thomas Gleixner <tglx@...utronix.de>

> ---
>  kernel/time/clocksource.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
> index 7e4fad7..150242c 100644
> --- a/kernel/time/clocksource.c
> +++ b/kernel/time/clocksource.c
> @@ -89,6 +89,7 @@ clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 maxsec)
>  	*mult = tmp;
>  	*shift = sft;
>  }
> +EXPORT_SYMBOL_GPL(clocks_calc_mult_shift);
>  
>  /*[Clocksource internal variables]---------
>   * curr_clocksource:
> -- 
> 2.10.1
> 
>