On Thu, Jul 09, 2015 at 04:31:25PM +0800, Jisheng Zhang wrote:
> This patch implements cpuidle_ops using psci. After this patch, we can
> use cpuidle-arm.c with psci backend for both arm and arm64.
>
> Signed-off-by: Jisheng Zhang <jszh...@marvell.com>
> ---
> arch/arm/kernel/Makefile | 1 +
> arch/arm/kernel/psci_cpuidle.c | 19 +++++++++++++++++++
> 2 files changed, 20 insertions(+)
> create mode 100644 arch/arm/kernel/psci_cpuidle.c
>
> diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
> index 3b995f5..96383d8 100644
> --- a/arch/arm/kernel/Makefile
> +++ b/arch/arm/kernel/Makefile
> @@ -91,6 +91,7 @@ obj-$(CONFIG_ARM_VIRT_EXT) += hyp-stub.o
> ifeq ($(CONFIG_ARM_PSCI),y)
> obj-y += psci-call.o
> obj-$(CONFIG_SMP) += psci_smp.o
> +obj-$(CONFIG_CPU_IDLE) += psci_cpuidle.o
> endif
>
> extra-y := $(head-y) vmlinux.lds
> diff --git a/arch/arm/kernel/psci_cpuidle.c b/arch/arm/kernel/psci_cpuidle.c
> new file mode 100644
> index 0000000..e7146d2
> --- /dev/null
> +++ b/arch/arm/kernel/psci_cpuidle.c
> @@ -0,0 +1,19 @@
> +/*
> + * Copyright (C) 2015 Marvell Technology Group Ltd.
> + * Author: Jisheng Zhang <jszh...@marvell.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/cpuidle.h>
> +#include <linux/psci.h>
> +
> +#include <asm/cpuidle.h>
> +
> +static struct cpuidle_ops psci_cpuidle_ops __initdata = {
> + .suspend = cpu_psci_cpu_suspend,
> + .init = cpu_psci_cpu_init_idle,
> +};
> +CPUIDLE_METHOD_OF_DECLARE(psci_cpuidle, "psci", &psci_cpuidle_ops);
Is there any reason this can't live in the drivers sub-tree? Is there
anything specific to 32-bit ARM about this?
It looks to me like the right thing to do is to have it as part of
drivers/firmware/psci.c.
We don't do this for other stuff - we don't have IRQ_CHIP_OF_DECLARE
stuff in arch/arm but have the IRQ chip drivers in drivers/irqchip.
We keep it all togehter in drivers/irqchip, even when the IRQ chip
driver is only useful on ARM.
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