[PATCH] ARM: imx: add cpufreq support for i.mx6sx

[Shawn Guo]

On Mon, Jun 23, 2014 at 12:10:32PM +0800, Anson Huang wrote:
> Add cpufreq support for i.MX6SX, using common
> i.MX6Q cpufreq driver.
> 
> Signed-off-by: Anson Huang <b20788 at freescale.com>
> ---
>  arch/arm/mach-imx/mach-imx6sx.c |   27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/arch/arm/mach-imx/mach-imx6sx.c b/arch/arm/mach-imx/mach-imx6sx.c
> index 74ff7d6..be2ca52 100644
> --- a/arch/arm/mach-imx/mach-imx6sx.c
> +++ b/arch/arm/mach-imx/mach-imx6sx.c
> @@ -8,6 +8,7 @@
>  
>  #include <linux/irqchip.h>
>  #include <linux/of_platform.h>
> +#include <linux/pm_opp.h>
>  #include <asm/mach/arch.h>
>  #include <asm/mach/map.h>
>  
> @@ -39,9 +40,35 @@ static void __init imx6sx_init_irq(void)
>  	irqchip_init();
>  }
>  
> +static void __init imx6sx_opp_init(struct device *cpu_dev)
> +{
> +	struct device_node *np;
> +
> +	np = of_find_node_by_path("/cpus/cpu at 0");
> +	if (!np) {
> +		pr_warn("failed to find cpu0 node\n");
> +		return;
> +	}
> +
> +	cpu_dev->of_node = np;
> +	if (of_init_opp_table(cpu_dev))
> +		pr_warn("failed to init OPP table\n");
> +
> +	of_node_put(np);
> +}

The whole function is not needed for imx6sx, because we do not need to
tweak OPP table like what we do on imx6q.  In this case, we can just
let imx6q-cpufreq call of_init_opp_table() on its own.

Shawn

> +
> +static struct platform_device imx6sx_cpufreq_pdev = {
> +	.name = "imx6q-cpufreq",
> +};
> +
>  static void __init imx6sx_init_late(void)
>  {
>  	imx6q_cpuidle_init();
> +
> +	if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ)) {
> +		imx6sx_opp_init(&imx6sx_cpufreq_pdev.dev);
> +		platform_device_register(&imx6sx_cpufreq_pdev);
> +	}
>  }
>  
>  static const char *imx6sx_dt_compat[] __initconst = {
> -- 
> 1.7.9.5
>