linux-kernel - Re: [PATCH v2 5/5] cpuidle: ARM: Add cpuidle driver for K1879XB1YA

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Date:	Tue, 30 Jun 2015 17:24:31 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Andrew Andrianov <andrew@...mnt.org>
CC:	Pawel Moll <Pawel.Moll@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Rob Herring <robh+dt@...nel.org>,
	Sudeep Holla <sudeep.holla@....com>,
	Andrew Andrianov <andrianov@...ule.ru>,
	"pshevch@...ule.ru" <pshevch@...ule.ru>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/5] cpuidle: ARM: Add cpuidle driver for K1879XB1YA



On 30/06/15 16:15, Andrew Andrianov wrote:
> Signed-off-by: Andrew Andrianov <andrew@...mnt.org>
> ---
>   drivers/cpuidle/Kconfig.arm            |  6 +++++
>   drivers/cpuidle/Makefile               |  1 +
>   drivers/cpuidle/cpuidle-rcm-k1879xb1.c | 48 ++++++++++++++++++++++++++++++++++
>   3 files changed, 55 insertions(+)
>   create mode 100644 drivers/cpuidle/cpuidle-rcm-k1879xb1.c
>
> diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
> index 21340e0..988bfa3 100644
> --- a/drivers/cpuidle/Kconfig.arm
> +++ b/drivers/cpuidle/Kconfig.arm
> @@ -74,3 +74,9 @@ config ARM_MVEBU_V7_CPUIDLE
>   	depends on ARCH_MVEBU && !ARM64
>   	help
>   	  Select this to enable cpuidle on Armada 370, 38x and XP processors.
> +
> +config ARM_RCM_K1879XB1_CPUIDLE
> +	bool "CPU Idle Driver for RC Module's K1879XB1YA SoC"
> +	depends on ARCH_RCM_K1879XB1 && !ARM64
> +	help
> +	  Select this to enable cpuidle on K1879XB1YA SoC.
> diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
> index 3ba81b1..71b7e16 100644
> --- a/drivers/cpuidle/Makefile
> +++ b/drivers/cpuidle/Makefile
> @@ -17,6 +17,7 @@ obj-$(CONFIG_ARM_ZYNQ_CPUIDLE)		+= cpuidle-zynq.o
>   obj-$(CONFIG_ARM_U8500_CPUIDLE)         += cpuidle-ux500.o
>   obj-$(CONFIG_ARM_AT91_CPUIDLE)          += cpuidle-at91.o
>   obj-$(CONFIG_ARM_EXYNOS_CPUIDLE)        += cpuidle-exynos.o
> +obj-$(CONFIG_ARM_RCM_K1879XB1_CPUIDLE)  += cpuidle-rcm-k1879xb1.o
>   obj-$(CONFIG_ARM_CPUIDLE)		+= cpuidle-arm.o
>
>   ###############################################################################
> diff --git a/drivers/cpuidle/cpuidle-rcm-k1879xb1.c b/drivers/cpuidle/cpuidle-rcm-k1879xb1.c
> new file mode 100644
> index 0000000..7c621b6
> --- /dev/null
> +++ b/drivers/cpuidle/cpuidle-rcm-k1879xb1.c
> @@ -0,0 +1,48 @@
> +/*
> + * CPU idle for RC Module K1879XB1YA SoC
> + *
> + * Copyright (C) 2015 RC Module.
> + * http://www.module.ru/
> + *
> + * Andrew Andrianov <andrew@...mnt.org>
> + *
> + * Based on Davinci CPU idle code
> + * (arch/arm/mach-davinci/cpuidle.c)
> + *
> + * 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/io.h>
> +#include <linux/platform_device.h>
> +#include <linux/cpuidle.h>
> +#include <asm/cpuidle.h>
> +
> +/*
> + * We only enable WFI here, since DDR will enter self-refresh
> + * on it's own when it can (bootloader takes care to configure that)
> + */
> +
> +static struct cpuidle_driver rcm_idle_driver = {
> +	.name			= "rcm_k1879xb1_idle",
> +	.states[0]		= ARM_CPUIDLE_WFI_STATE,

Do you plan to add more states in future ?
Otherwise default_idle_call will be sufficient to enter WFI
and you need not register any cpuidle driver.

Regards,
Sudeep
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