[PATCH 6/7] arm/imx6q: add cpufreq support

[Sascha Hauer]

On Mon, Dec 12, 2011 at 11:42:31AM +0800, Richard Zhao wrote:
> Signed-off-by: Richard Zhao <richard.zhao at linaro.org>
> ---
>  arch/arm/mach-imx/Kconfig        |    1 +
>  arch/arm/mach-imx/Makefile       |    2 +-
>  arch/arm/mach-imx/cpu_op-imx6q.c |   78 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 80 insertions(+), 1 deletions(-)
>  create mode 100644 arch/arm/mach-imx/cpu_op-imx6q.c
> 
> diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
> index fbd414b..7d813a3 100644
> --- a/arch/arm/mach-imx/Kconfig
> +++ b/arch/arm/mach-imx/Kconfig
> @@ -837,6 +837,7 @@ config SOC_IMX6Q
>  	select ARM_GIC
>  	select CACHE_L2X0
>  	select CPU_V7
> +	select ARCH_HAS_CPUFREQ
>  	select HAVE_ARM_SCU
>  	select HAVE_IMX_GPC
>  	select HAVE_IMX_MMDC
> diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
> index 9cf630a..2dfe4a7 100644
> --- a/arch/arm/mach-imx/Makefile
> +++ b/arch/arm/mach-imx/Makefile
> @@ -72,7 +72,7 @@ AFLAGS_head-v7.o :=-Wa,-march=armv7-a
>  obj-$(CONFIG_SMP) += platsmp.o
>  obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
>  obj-$(CONFIG_LOCAL_TIMERS) += localtimer.o
> -obj-$(CONFIG_SOC_IMX6Q) += clock-imx6q.o mach-imx6q.o pm-imx6q.o
> +obj-$(CONFIG_SOC_IMX6Q) += clock-imx6q.o mach-imx6q.o pm-imx6q.o cpu_op-imx6q.o
>  
>  # i.MX5 based machines
>  obj-$(CONFIG_MACH_MX51_BABBAGE) += mach-mx51_babbage.o
> diff --git a/arch/arm/mach-imx/cpu_op-imx6q.c b/arch/arm/mach-imx/cpu_op-imx6q.c
> new file mode 100644
> index 0000000..8807b96
> --- /dev/null
> +++ b/arch/arm/mach-imx/cpu_op-imx6q.c
> @@ -0,0 +1,78 @@
> +/*
> + * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
> + */
> +
> +/*
> + * The code contained herein is licensed under the GNU General Public
> + * License. You may obtain a copy of the GNU General Public License
> + * Version 2 or later at the following locations:
> + *
> + * http://www.opensource.org/licenses/gpl-license.html
> + * http://www.gnu.org/copyleft/gpl.html
> + */
> +
> +#include <linux/types.h>
> +#include <linux/kernel.h>
> +#include <linux/string.h>
> +#include <mach/hardware.h>
> +
> +static u32 arm_max_freq;
> +static int num_cpu_op;

Unused variable.

> +
> +/* working point(wp): 0 - 1GHzMHz; 1 - 800MHz, 3 - 400MHz, 4  - 160MHz */

s/GHzMHz/GHz/

> +static struct cpu_op mx6q_cpu_op_1G[] = {
> +	{
> +	 .cpu_rate = 996000000,
> +	 .cpu_voltage = 1225000,},
> +	{

Strange indention.



> +	 .cpu_rate = 792000000,
> +	 .cpu_voltage = 1100000,},
> +	{
> +	  .cpu_rate = 396000000,
> +	  .cpu_voltage = 950000,},
> +	{
> +	 .cpu_rate = 198000000,
> +	 .cpu_voltage = 850000,},
> +};
> +
> +static struct cpu_op mx6q_cpu_op[] = {
> +	{
> +	 .cpu_rate = 792000000,
> +	 .cpu_voltage = 1100000,},
> +	{
> +	  .cpu_rate = 396000000,
> +	  .cpu_voltage = 950000,},
> +	{
> +	 .cpu_rate = 198000000,
> +	 .cpu_voltage = 850000,},
> +};
> +
> +struct cpu_op *mx6q_get_cpu_op(int *op)
> +{
> +	if (arm_max_freq == 1000) {
> +		*op =  num_cpu_op = ARRAY_SIZE(mx6q_cpu_op_1G);
> +		return mx6q_cpu_op_1G;
> +	} else {
> +		*op =  num_cpu_op = ARRAY_SIZE(mx6q_cpu_op);
> +		return mx6q_cpu_op;
> +	}

Why not just return &mx6q_cpu_op[1] instead of creating a second array?

> +}
> +
> +static int __init mx6q_cpu_op_init(void)
> +{
> +	get_cpu_op = mx6q_get_cpu_op;
> +	return 0;
> +}
> +
> +core_initcall(mx6q_cpu_op_init);
> +
> +static int __init set_arm_max_freq(char *p)
> +{
> +	if (strncmp(p, "1000", 4) == 0)
> +		arm_max_freq = 1000;
> +	else if (strncmp(p, "800", 3) == 0)
> +		arm_max_freq = 800;
> +	return 0;
> +}
> +
> +early_param("arm_freq", set_arm_max_freq);

Do we need this? I suppose this should be passed by the device tree if
necessary.

Sascha

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