linux-kernel - Re: [PATCH] soc: samsung: pmu: split up SoC specific PMU data

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Message-id: <547EA0DC.70800@samsung.com>
Date:	Wed, 03 Dec 2014 14:34:20 +0900
From:	jonghwa3.lee@...sung.com
To:	Pankaj Dubey <pankaj.dubey@...sung.com>
Cc:	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	b.zolnierkie@...sung.com, amit.daniel@...sung.com,
	kgene.kim@...sung.com, arnd@...db.de, thomas.ab@...sung.com
Subject: Re: [PATCH] soc: samsung: pmu: split up SoC specific PMU data

On 2014년 12월 01일 01:16, Pankaj Dubey wrote:

> This patch splits up exynos-pmu.c file, and moves PMU configuration data
> and functions handing those data into SoC specific PMU files, keeping
> driver structure and common functionality into exynos-pmu.c.
> 
> At the same time it also separates compilation of these different SoC PMU files
> based on CONFIG_ARM64 and CONFIG_ARM. This way we can reduce overhead of ARM64
> SoC's PMU getting compiled when kernel is built for ARM and vice-versa.
> 
> This patch also removes .owner field from exynos-pmu.c as it's redundant for
> drivers calling platform_driver_register to register platform_driver.
> 
> Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
> ---
> This patch is prepared on top of kgene/for-next and following patch [1] from
> Amit Daniel.
> 
> [1]: http://www.spinics.net/lists/linux-samsung-soc/msg39797.html
> 
> This patch tries to address some of concerns raised for using exynos-pmu.c for
> ARM and ARM64 based SoC at these threads [2], [3].
> 
> [2]: http://www.spinics.net/lists/linux-samsung-soc/msg39809.html
> [3]: https://lkml.org/lkml/2014/11/24/322
> 
> Since Exynos SoC's has similar PMU IP, and already existing bindings can be
> used, it makes sense to keep single driver for both ARM and ARM64 based SoCs.
> All common functionalties are in exynos-pmu.c whereas SoC specific data and 
> handling are moved into SoC specific exynosNNNN-pmu files.
> 
> All changes are compiled tested only. Any improvements/suggestions are most
> welcome.
> 
>  drivers/soc/samsung/Makefile         |    9 +-
>  drivers/soc/samsung/exynos-pmu.c     | 1293 +---------------------------------
>  drivers/soc/samsung/exynos-pmu.h     |   63 ++
>  drivers/soc/samsung/exynos3250-pmu.c |  176 +++++
>  drivers/soc/samsung/exynos4-pmu.c    |  223 ++++++
>  drivers/soc/samsung/exynos5250-pmu.c |  196 ++++++
>  drivers/soc/samsung/exynos5420-pmu.c |  298 ++++++++
>  drivers/soc/samsung/exynos7-pmu.c    |  441 ++++++++++++
>  8 files changed, 1412 insertions(+), 1287 deletions(-)
>  create mode 100644 drivers/soc/samsung/exynos-pmu.h
>  create mode 100644 drivers/soc/samsung/exynos3250-pmu.c
>  create mode 100644 drivers/soc/samsung/exynos4-pmu.c
>  create mode 100644 drivers/soc/samsung/exynos5250-pmu.c
>  create mode 100644 drivers/soc/samsung/exynos5420-pmu.c
>  create mode 100644 drivers/soc/samsung/exynos7-pmu.c
> 

...

> diff --git a/drivers/soc/samsung/exynos-pmu.h b/drivers/soc/samsung/exynos-pmu.h
> new file mode 100644
> index 0000000..4adc5a3
> --- /dev/null
> +++ b/drivers/soc/samsung/exynos-pmu.h
> @@ -0,0 +1,63 @@
> +/*
> + * Copyright (c) 2014 Samsung Electronics Co., Ltd.
> + *		http://www.samsung.com
> + *
> + * Header for EXYNOS PMU Driver support
> + *
> + * 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.
> + */
> +
> +#ifndef __EXYNOSPMU_H
> +#define __EXYNOSPMU_H
> +
> +#include <linux/io.h>
> +
> +#define PMU_TABLE_END	(-1U)
> +
> +static void __iomem *pmu_base_addr;
> +

AFAIK, static variable in header file can't be used globally. It would be placed
in exynos-pmu.c or elsewhere and then only extern declaration is allowed here.
If I'm wrong, please let me know.

Thanks.
Jonghwa
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