linux-kernel - Re: [PATCH v2 1/2] clk: fractional-divider: switch to rational best approximation

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Date:	Mon, 30 Mar 2015 17:32:29 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-kernel@...r.kernel.org, heikki.krogerus@...ux.intel.com
Subject: Re: [PATCH v2 1/2] clk: fractional-divider: switch to rational best
 approximation

On 03/30/15 11:57, Andy Shevchenko wrote:
> This patch converts the code to use rational best approximation algorithm which
> is more precise.
>
> Suggested-by: Stephen Boyd <sboyd@...eaurora.org>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/clk/Kconfig                  |  3 +--
>  drivers/clk/clk-fractional-divider.c | 39 ++++++++++++++----------------------
>  2 files changed, 16 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index 0b474a0..46d90a9 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -14,6 +14,7 @@ config COMMON_CLK
>  	select HAVE_CLK_PREPARE
>  	select CLKDEV_LOOKUP
>  	select SRCU
> +	select RATIONAL
>  	---help---
>  	  The common clock framework is a single definition of struct
>  	  clk, useful across many platforms, as well as an
> @@ -63,7 +64,6 @@ config COMMON_CLK_SI5351
>  	tristate "Clock driver for SiLabs 5351A/B/C"
>  	depends on I2C
>  	select REGMAP_I2C
> -	select RATIONAL
>  	---help---
>  	  This driver supports Silicon Labs 5351A/B/C programmable clock
>  	  generators.
> @@ -139,7 +139,6 @@ config COMMON_CLK_CDCE706
>  	tristate "Clock driver for TI CDCE706 clock synthesizer"
>  	depends on I2C
>  	select REGMAP_I2C
> -	select RATIONAL
>  	---help---
>  	  This driver supports TI CDCE706 programmable 3-PLL clock synthesizer.

Will some kernel janitor find us if we leave the selects here? I know
you removed it because COMMON_CLK must be Y here and we'd always select
RATIONAL, but it feels better to leave it alone and actually split off
the basic clock types into individual configs so that the tiny kernel
users don't have unused code lying around. That could be future work
someday and then we might forget to select RATIONAL again.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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