linux-kernel - Re: [Patch v1 05/10] dt-bindings: tegra: add icc ids for dummy MC clients

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Date:   Fri, 13 Jan 2023 20:14:56 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <treding@...dia.com>, <dmitry.osipenko@...labora.com>,
        <viresh.kumar@...aro.org>, <rafael@...nel.org>,
        <jonathanh@...dia.com>, <robh+dt@...nel.org>,
        <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>
CC:     <sanjayc@...dia.com>, <ksitaraman@...dia.com>, <ishah@...dia.com>,
        <bbasu@...dia.com>, Sumit Gupta <sumitg@...dia.com>
Subject: Re: [Patch v1 05/10] dt-bindings: tegra: add icc ids for dummy MC
 clients



On 22/12/22 16:59, Krzysztof Kozlowski wrote:
> External email: Use caution opening links or attachments
> 
> 
> On 20/12/2022 17:02, Sumit Gupta wrote:
>> Adding ICC id's for dummy software clients representing CCPLEX clusters.
>>
>> Signed-off-by: Sumit Gupta <sumitg@...dia.com>
>> ---
>>   include/dt-bindings/memory/tegra234-mc.h | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/include/dt-bindings/memory/tegra234-mc.h b/include/dt-bindings/memory/tegra234-mc.h
>> index 347e55e89a2a..6e60d55491b3 100644
>> --- a/include/dt-bindings/memory/tegra234-mc.h
>> +++ b/include/dt-bindings/memory/tegra234-mc.h
>> @@ -536,4 +536,9 @@
>>   #define TEGRA234_MEMORY_CLIENT_NVJPG1SRD 0x123
>>   #define TEGRA234_MEMORY_CLIENT_NVJPG1SWR 0x124
>>
>> +/* ICC ID's for dummy MC clients used to represent CPU Clusters */
>> +#define TEGRA_ICC_MC_CPU_CLUSTER0       1003
> 
> Why the IDs do not start from 0?
> 
> Best regards,
> Krzysztof
> 

MC client ID's are starting from zero. These ID's are used as 
"icc_node->id" while creating the icc_node. So, can't use the duplicate 
numbers.

  $ grep TEGRA234_MEMORY_ "include/dt-bindings/memory/tegra234- mc.h"
  #define TEGRA234_MEMORY_CLIENT_PTCR 0x00
  #define TEGRA234_MEMORY_CLIENT_MIU7R 0x01
  #define TEGRA234_MEMORY_CLIENT_MIU7W 0x02
  #define TEGRA234_MEMORY_CLIENT_MIU8R 0x03
  ....

Dummy ID's which are already being used are starting from '1000'. So, 
added to that number as the ID's used for creating "icc_node" for CPU 
clusters are also dummy and they are not part of HW MC client's list.

  $ grep "100[0-9]" ./drivers/memory/tegra/mc.h
  #define TEGRA_ICC_MC            1000
  #define TEGRA_ICC_EMC           1001
  #define TEGRA_ICC_EMEM          1002