linux-kernel - Re: [PATCH 3/3] ARM: zynq: Extend SLCR driver to read OCM configuration

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Date:	Mon, 06 Oct 2014 19:54:53 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Sören Brinkmann <soren.brinkmann@...inx.com>,
	Michal Simek <michal.simek@...inx.com>
CC:	linux-arm-kernel@...ts.infradead.org,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Rob Herring <robherring2@...il.com>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] ARM: zynq: Extend SLCR driver to read OCM configuration

Hi Soren,

On 10/06/2014 05:59 PM, Sören Brinkmann wrote:
> Hi Michal,
> 
> On Mon, 2014-10-06 at 01:44PM +0200, Michal Simek wrote:
>> Get OCM configuration from SLCR.
>>
>> Signed-off-by: Michal Simek <michal.simek@...inx.com>
>> ---
>>
>>  arch/arm/mach-zynq/slcr.c | 15 +++++++++++++++
>>  include/soc/zynq/common.h |  1 +
>>  2 files changed, 16 insertions(+)
>>
>> diff --git a/arch/arm/mach-zynq/slcr.c b/arch/arm/mach-zynq/slcr.c
>> index cb7c46165728..0c3e45090c09 100644
>> --- a/arch/arm/mach-zynq/slcr.c
>> +++ b/arch/arm/mach-zynq/slcr.c
>> @@ -27,6 +27,7 @@
>>  #define SLCR_A9_CPU_RST_CTRL_OFFSET	0x244 /* CPU Software Reset Control */
>>  #define SLCR_REBOOT_STATUS_OFFSET	0x258 /* PS Reboot Status */
>>  #define SLCR_PSS_IDCODE			0x530 /* PS IDCODE */
>> +#define SLCR_OCM_CFG_OFFSET		0x910 /* OCM Address Mapping */
>>
>>  #define SLCR_UNLOCK_MAGIC		0xDF0D
>>  #define SLCR_A9_CPU_CLKSTOP		0x10
>> @@ -126,6 +127,20 @@ void zynq_slcr_system_reset(void)
>>  }
>>
>>  /**
>> + * zynq_slcr_get_ocm_config - Get SLCR OCM config
>> + *
>> + * Return:	OCM config bits
>> + */
>> +u32 zynq_slcr_get_ocm_config(void)
>> +{
>> +	u32 val;
>> +
>> +	zynq_slcr_read(&val, SLCR_OCM_CFG_OFFSET);
>> +
>> +	return val;
>> +}
> 
> a different idea would be, instead of creating this specific API call
> for the OCMC to let the OCMC driver use regmap and making git a subnode
> of the SLCR.
> In the long run that might be a better option otherwise we'll end up
> with a whole bunch of zynq_slcr_get_foo() calls for each driver that
> needs to read an SLCR register.

yes using regmap is also possible and I know that.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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