On Mon, Apr 16, 2012 at 06:50:12PM -0500, Robert Lee wrote:
> Add common cpuidle init functionality that can be used by various
> imx platforms.
>
> Signed-off-by: Robert Lee <rob....@linaro.org>
> ---
> diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
> index e81290c..7c9e05f 100644
> --- a/arch/arm/plat-mxc/Makefile
> +++ b/arch/arm/plat-mxc/Makefile
> @@ -16,6 +16,8 @@ obj-$(CONFIG_MXC_ULPI) += ulpi.o
> obj-$(CONFIG_MXC_USE_EPIT) += epit.o
> obj-$(CONFIG_MXC_DEBUG_BOARD) += 3ds_debugboard.o
> obj-$(CONFIG_CPU_FREQ_IMX) += cpufreq.o
> +obj-$(CONFIG_CPU_IDLE) += cpuidle.o
> +
> ifdef CONFIG_SND_IMX_SOC
> obj-y += ssi-fiq.o
> obj-y += ssi-fiq-ksym.o
> diff --git a/arch/arm/plat-mxc/cpuidle.c b/arch/arm/plat-mxc/cpuidle.c
> new file mode 100644
> index 0000000..d1c9301
> --- /dev/null
> +++ b/arch/arm/plat-mxc/cpuidle.c
> @@ -0,0 +1,89 @@
> +/*
> + * Copyright 2012 Freescale Semiconductor, Inc.
> + * Copyright 2012 Linaro Ltd.
> + *
> + * 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/kernel.h>
> +#include <linux/io.h>
> +#include <linux/cpuidle.h>
> +#include <linux/hrtimer.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +
> +static struct cpuidle_device __percpu * imx_cpuidle_devices;
> +static struct cpuidle_driver *drv;
> +
> +void __init imx_cpuidle_set_driver(struct cpuidle_driver *p)
> +{
> + drv = p;
> +}
You like it complicated, eh? Why do you introduce a function which sets
a variable...
> +
> +void imx_cpuidle_devices_uninit(void)
> +{
> + int cpu_id;
> + struct cpuidle_device *dev;
> +
> + for_each_possible_cpu(cpu_id) {
> + dev = per_cpu_ptr(imx_cpuidle_devices, cpu_id);
> + cpuidle_unregister_device(dev);
> + }
> +
> + free_percpu(imx_cpuidle_devices);
> +}
> +
> +static int __init imx_cpuidle_init(void)
... instead of passing it directly to the function which uses it?
> +{
> + struct cpuidle_device *dev;
> + int cpu_id, ret;
> +
> + if (!drv || drv->state_count > CPUIDLE_STATE_MAX) {
> + pr_err("%s: Invalid Input\n", __func__);
You introduce a pointless error message on SoCs not setting a cpuidle
driver. When will people learn that initcalls do not only run on
machines they have on their desk?
> + return -EINVAL;
> + }
> +
> + ret = cpuidle_register_driver(drv);
> +
> + if (ret) {
> + pr_err("%s: Failed to register cpuidle driver\n", __func__);
It's always nice to add the return value to the error message to get a
clue *what* went wrong. The function name though is rather
uninteresting.
Sascha
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