linux-kernel - Re: [PATCH 03/10] ARM: EXYNOS: Move SYSREG definition into sys-reg specific file

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Message-id: <53478692.3020406@samsung.com>
Date:	Fri, 11 Apr 2014 15:07:14 +0900
From:	Pankaj Dubey <pankaj.dubey@...sung.com>
To:	Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, kgene.kim@...sung.com,
	linux@....linux.org.uk, chow.kim@...sung.com,
	Young-Gun Jang <yg1004.jang@...sung.com>
Subject: Re: [PATCH 03/10] ARM: EXYNOS: Move SYSREG definition into sys-reg
 specific file

On 04/02/2014 08:27 PM, Sylwester Nawrocki wrote:
> Hi,
>
> On 02/04/14 09:50, Pankaj Dubey wrote:
>> From: Young-Gun Jang <yg1004.jang@...sung.com>
>>
>> While making PMU (Power Mengement Unit) implementation device tree based,
>> there are few offsets related with SYSREG present in regs-pmu.h, so let's
>> make a new header file "regs-sys.h" to keep all such SYSREG related
>> register definition and remove them from "regs-pmu.h"
>>
>> Signed-off-by: Young-Gun Jang <yg1004.jang@...sung.com>
>> Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
>> ---
>>   arch/arm/mach-exynos/exynos.c   |    1 +
>>   arch/arm/mach-exynos/pm.c       |    1 +
>>   arch/arm/mach-exynos/regs-pmu.h |    3 ---
>>   arch/arm/mach-exynos/regs-sys.h |   22 ++++++++++++++++++++++
>>   4 files changed, 24 insertions(+), 3 deletions(-)
>>   create mode 100644 arch/arm/mach-exynos/regs-sys.h
> [...]
>> diff --git a/arch/arm/mach-exynos/regs-sys.h b/arch/arm/mach-exynos/regs-sys.h
>> new file mode 100644
>> index 0000000..84332b0
>> --- /dev/null
>> +++ b/arch/arm/mach-exynos/regs-sys.h
>> @@ -0,0 +1,22 @@
>> +/*
>> + * Copyright (c) 2014 Samsung Electronics Co., Ltd.
>> + *             http://www.samsung.com
>> + *
>> + * EXYNOS - system register definition
>> + *
>> + * 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 __ASM_ARCH_REGS_SYS_H
>> +#define __ASM_ARCH_REGS_SYS_H __FILE__
>> +
>> +#include <mach/map.h>
>> +
>> +#define S5P_SYSREG(x)                          (S3C_VA_SYS + (x))
>> +
>> +/* For EXYNOS5 */
>> +#define EXYNOS5_SYS_I2C_CFG                    S5P_SYSREG(0x0234)
> Can this be defined as a regular register offset in a header file
> placed at include/linux/mfd/syscon/ ? I.e. can the mfd syscon driver be
> used instead of these hacks ?
>
No. As currently SysRegs are being accessed via iodesc table and not via DT,
it has dependency on "mach/map.h".
We separated these definitions from "regs-pmu.h" as it does not belong to EXYNOS 
PMU IP.
But this can be done once we make some way of accessing SysReg register sets via DT.

-- 
Best Regards,
Pankaj Dubey

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