From: t.figa@samsung•com (Tomasz Figa)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCHv4 7/7] ARM: dts: Add device tree sources for Exynos3250
Date: Fri, 09 May 2014 10:01:39 +0200 [thread overview]
Message-ID: <536C8B63.3000400@samsung.com> (raw)
In-Reply-To: <536C7F65.50503@samsung.com>
On 09.05.2014 09:10, Chanwoo Choi wrote:
> Hi Tomasz,
>
> On 05/09/2014 02:02 PM, Tomasz Figa wrote:
>> Hi Chanwoo,
>>
>> On 09.05.2014 03:06, Chanwoo Choi wrote:
>>> On 04/26/2014 09:51 AM, Tomasz Figa wrote:
>>>> On 25.04.2014 03:16, Chanwoo Choi wrote:
>>
>> [snip]
>>
>>>>> + cpus {
>>>>> + #address-cells = <1>;
>>>>> + #size-cells = <0>;
>>>>> +
>>>>> + cpu at 0 {
>>>>> + device_type = "cpu";
>>>>> + compatible = "arm,cortex-a7";
>>>>> + reg = <0>;
>>>>> + clock-frequency = <1000000000>;
>>>>> + };
>>>>
>>>> Why only one CPU? I believe Exynos3250 is dual core.
>>>
>>> I'll add cpu1 information.
>>>
>>>> Also are physical IDs of the cores really 0 and 1? On Exynos4210 for example they are 0x900 and 0x901, while on Exynos4212 they are 0xa00 and 0xa01. Please check this.
>>>
>>> The 'reg' property means only hardware id(hwid) of CPU.
>>> You can check it on arm_dt_init_cpu_maps() in arch/arm/kernel/devtree.c.h.
>>> or Documentation/devicetree/bindings/arm/cpus.txt.
>>>
>>
>> Well, as described in Documentation/devicetree/bindings/arm/cpus.txt, on 32-bit ARM v7 or later CPUs the "reg" property should be equal to the lower 24-bits of MPIDR value of given CPU, which in addition to core ID includes also cluster ID, which can be non-zero, even on single cluster SoCs (like it is on Exynos4210 and 4x12).
>
> I checked the lower 24-bit of MPIDR value for Exynos3250 in arm_dt_init_cpu_maps().
> - the lower 24-bit of MPIDR for CPU0 is '0x0'.
Fair enough. Thanks.
Best regards,
Tomasz
prev parent reply other threads:[~2014-05-09 8:01 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-25 1:16 [PATCHv4 0/7] Support new Exynos3250 SoC based on Cortex-A7 dual core Chanwoo Choi
2014-04-25 1:16 ` [PATCHv4 1/7] ARM: EXYNOS: Add Exynos3250 SoC ID Chanwoo Choi
2014-04-26 0:40 ` Tomasz Figa
2014-04-25 1:16 ` [PATCHv4 2/7] ARM: EXYNOS: Support secondary CPU boot of Exynos4212 Chanwoo Choi
2014-04-26 0:42 ` Tomasz Figa
2014-04-26 10:49 ` Kukjin Kim
2014-04-25 1:16 ` [PATCHv4 3/7] ARM: EXYNOS: Support secondary CPU boot of Exynos3250 Chanwoo Choi
2014-04-25 4:30 ` Tushar Behera
2014-04-25 5:43 ` Chanwoo Choi
2014-04-25 5:54 ` Tushar Behera
2014-04-25 5:56 ` Chanwoo Choi
2014-04-25 1:16 ` [PATCHv4 4/7] ARM: EXYNOS: Enter a15 lowpower mode for Exynos3250 based on Cortex-a7 Chanwoo Choi
2014-04-26 0:25 ` Tomasz Figa
2014-04-26 0:30 ` Russell King - ARM Linux
2014-04-30 8:00 ` Chanwoo Choi
2014-04-25 1:16 ` [PATCHv4 5/7] clk: samsung: exynos3250: Add clocks using common clock framework Chanwoo Choi
2014-04-26 0:39 ` Tomasz Figa
2014-05-13 11:49 ` Chanwoo Choi
2014-05-13 16:28 ` Tomasz Figa
2014-05-14 6:57 ` Chanwoo Choi
2014-05-14 13:45 ` Tomasz Figa
2014-04-25 1:16 ` [PATCHv4 6/7] dt-bindings: add documentation for Exynos3250 clock controller Chanwoo Choi
2014-04-25 1:16 ` [PATCHv4 7/7] ARM: dts: Add device tree sources for Exynos3250 Chanwoo Choi
2014-04-25 4:38 ` Tushar Behera
2014-04-25 5:03 ` Chanwoo Choi
2014-04-26 0:51 ` Tomasz Figa
2014-04-26 11:38 ` Tomasz Figa
2014-05-09 6:49 ` Chanwoo Choi
2014-05-09 8:01 ` Tomasz Figa
2014-05-09 8:15 ` Chanwoo Choi
2014-05-09 1:06 ` Chanwoo Choi
2014-05-09 5:02 ` Tomasz Figa
2014-05-09 7:10 ` Chanwoo Choi
2014-05-09 8:01 ` Tomasz Figa [this message]
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