linux-kernel - Re: [PATCH 09/13] AT91: PIT: (Almost) remove the global variables

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Date:	Thu, 26 Jun 2014 07:12:06 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux@...im.org.za, Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
CC:	Boris Brezillon <boris@...e-electrons.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Thomas Petazzoni <thomas@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/13] AT91: PIT: (Almost) remove the global variables

Hello Maxime,

On 25/06/2014 15:06, Maxime Ripard wrote:
> The timer driver is using some global variables to define some variables it has
> to use in most of its functions, like the base address.
>
> Use some container_of calls to have a single dynamic (and local) variable to
> hold this content.
>
> The only exception is in the !DT case, where the call chain to
> at91sam926x_ioremap_pit and then at91sam926x_pit_init as init_time makes it
> hard for the moment to pass the physical address of the timer.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> ---
>  arch/arm/mach-at91/at91sam926x_time.c | 179 ++++++++++++++++++++--------------
>  1 file changed, 108 insertions(+), 71 deletions(-)
>
> diff --git a/arch/arm/mach-at91/at91sam926x_time.c b/arch/arm/mach-at91/at91sam926x_time.c
> index 9678ac391a81..f2c463567beb 100644
> --- a/arch/arm/mach-at91/at91sam926x_time.c
> +++ b/arch/arm/mach-at91/at91sam926x_time.c
> @@ -20,6 +20,7 @@
>  #include <linux/of.h>
>  #include <linux/of_address.h>
>  #include <linux/of_irq.h>
> +#include <linux/slab.h>
>  

[...]

>  	unsigned	bits;
> @@ -186,67 +195,95 @@ static void __init at91sam926x_pit_common_init(unsigned int pit_irq)
>  	 * Use our actual MCK to figure out how many MCK/16 ticks per
>  	 * 1/HZ period (instead of a compile-time constant LATCH).
>  	 */
> -	pit_rate = clk_get_rate(mck) / 16;
> -	pit_cycle = (pit_rate + HZ/2) / HZ;
> -	WARN_ON(((pit_cycle - 1) & ~AT91_PIT_PIV) != 0);
> +	pit_rate = clk_get_rate(data->mck) / 16;
> +	data->cycle = (pit_rate + HZ/2) / HZ;

You could use DIV_ROUND_CLOSEST here.

Regards,

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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