linux-kernel - Re: [PATCH 2/4] dt-bindings: memory: mediatek: Add smi-sub-common property for reset

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Message-ID: <b4055440-d5a5-4d42-9cb7-9fc2f39a2148@kernel.org>
Date: Thu, 24 Oct 2024 08:38:57 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Friday Yang (杨阳) <Friday.Yang@...iatek.com>,
 "robh@...nel.org" <robh@...nel.org>,
 "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
 "conor+dt@...nel.org" <conor+dt@...nel.org>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Yong Wu (吴勇) <Yong.Wu@...iatek.com>,
 "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
 Project_Global_Chrome_Upstream_Group
 <Project_Global_Chrome_Upstream_Group@...iatek.com>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/4] dt-bindings: memory: mediatek: Add smi-sub-common
 property for reset

On 24/10/2024 03:28, Friday Yang (杨阳) wrote:
> On Wed, 2024-08-21 at 10:55 +0200, Krzysztof Kozlowski wrote:
>>  	 
>> External email : Please do not click links or open attachments until
>> you have verified the sender or the content.
>>  On 21/08/2024 10:26, friday.yang wrote:
>>> On the MediaTek platform, some SMI LARBs are directly linked to SMI
>>> common. While some SMI LARBs are linked to SMI sub common, then SMI
>>> sub common is linked to SMI common. Add 'mediatek,smi-sub-comm' and
>>> 'mediatek,smi-sub-comm-in-portid' properties here. The SMI reset
>>> driver could query which port of the SMI sub common the current
>> LARB
>>> is linked to through the two properties. The hardware block diagram
>>> could be described as below.
>>>
>>>              SMI Common(Smart Multimedia Interface Common)
>>>                  |
>>>          +----------------+-------
>>>          |                |
>>>          |                |
>>>          |                |
>>>          |                |
>>>          |                |
>>>        larb0       SMI Sub Common
>>>                    |      |     |
>>>                   larb1  larb2 larb3
>>>
>>> Signed-off-by: friday.yang <friday.yang@...iatek.com>
>>> ---
>>>  .../mediatek,smi-common.yaml                  |  2 ++
>>>  .../memory-controllers/mediatek,smi-larb.yaml | 22
>> +++++++++++++++++++
>>>  2 files changed, 24 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/memory-
>> controllers/mediatek,smi-common.yaml
>> b/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-
>> common.yaml
>>> index 2f36ac23604c..4392d349878c 100644
>>> --- a/Documentation/devicetree/bindings/memory-
>> controllers/mediatek,smi-common.yaml
>>> +++ b/Documentation/devicetree/bindings/memory-
>> controllers/mediatek,smi-common.yaml
>>> @@ -39,6 +39,7 @@ properties:
>>>            - mediatek,mt8186-smi-common
>>>            - mediatek,mt8188-smi-common-vdo
>>>            - mediatek,mt8188-smi-common-vpp
>>> +          - mediatek,mt8188-smi-sub-common
>>>            - mediatek,mt8192-smi-common
>>>            - mediatek,mt8195-smi-common-vdo
>>>            - mediatek,mt8195-smi-common-vpp
>>> @@ -107,6 +108,7 @@ allOf:
>>>          compatible:
>>>            contains:
>>>              enum:
>>> +              - mediatek,mt8188-smi-sub-common
>>>                - mediatek,mt8195-smi-sub-common
>>>      then:
>>>        required:
>>> diff --git a/Documentation/devicetree/bindings/memory-
>> controllers/mediatek,smi-larb.yaml
>> b/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-
>> larb.yaml
>>> index 2381660b324c..5f162bb360db 100644
>>> --- a/Documentation/devicetree/bindings/memory-
>> controllers/mediatek,smi-larb.yaml
>>> +++ b/Documentation/devicetree/bindings/memory-
>> controllers/mediatek,smi-larb.yaml
>>> @@ -69,6 +69,16 @@ properties:
>>>      description: the hardware id of this larb. It's only required
>> when this
>>>        hardware id is not consecutive from its M4U point of view.
>>>  
>>> +  mediatek,smi-sub-comm:
>>> +    $ref: /schemas/types.yaml#/definitions/phandle
>>> +    description: a phandle of smi_sub_common that the larb is
>> linked to.
>>
>> Why do you have to smi phandle properties per each node?
>>
> 
> As shown in the picture from the commit message, we have multipule smi-
> sub-common, each SMI larb may link to one of the smi-sub-common. So we
> need the 'mediatek,smi-sub-comm' to describe which smi-sub-common the
> larb is linked to.
> In next version, I will add two smi-sub-common to the diagram in the
> commit message.

You respond two months after... That email conversation is not even in
my mailbox anymore.

Anyway, sub-common are subnodes, no?

> 
>>> +
>>> +  mediatek,smi-sub-comm-in-portid:
>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>> +    minimum: 0
>>> +    maximum: 7
>>> +    description: which port of smi_sub_common that the larb is
>> linked to.
>>
>> Merge it into phandle.
>>
> 
> Just confirm,
> Do you mean merge these two into one property, like:
> mediatek,smi-sub-comm = <&phandle port-id>;

Yes


Best regards,
Krzysztof