linux-kernel - Re: [v3,1/2] dt-bindings: memory-controllers: Add MediaTek DRAM controller interface

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Message-ID: <30ff6b8c-befc-4233-8e61-c131b1f037ff@collabora.com>
Date: Wed, 2 Apr 2025 11:24:18 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Crystal Guo (郭晶) <Crystal.Guo@...iatek.com>,
 "robh@...nel.org" <robh@...nel.org>,
 "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
 "krzk@...nel.org" <krzk@...nel.org>,
 "conor+dt@...nel.org" <conor+dt@...nel.org>
Cc: "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 Project_Global_Chrome_Upstream_Group
 <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [v3,1/2] dt-bindings: memory-controllers: Add MediaTek DRAM
 controller interface

Il 02/04/25 05:51, Crystal Guo (郭晶) ha scritto:
> On Wed, 2025-03-26 at 11:18 +0100, AngeloGioacchino Del Regno wrote:
>> External email : Please do not click links or open attachments until
>> you have verified the sender or the content.
>>
>>
>> Il 26/03/25 07:30, Crystal Guo ha scritto:
>>> A MediaTek DRAM controller interface to provide the current DDR
>>> data rate.
>>>
>>> Signed-off-by: Crystal Guo <crystal.guo@...iatek.com>
>>> ---
>>>    .../memory-controllers/mediatek,dramc.yaml    | 44
>>> +++++++++++++++++++
>>>    1 file changed, 44 insertions(+)
>>>    create mode 100644 Documentation/devicetree/bindings/memory-
>>> controllers/mediatek,dramc.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/memory-
>>> controllers/mediatek,dramc.yaml
>>> b/Documentation/devicetree/bindings/memory-
>>> controllers/mediatek,dramc.yaml
>>> new file mode 100644
>>> index 000000000000..8bdacfc36cb5
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/memory-
>>> controllers/mediatek,dramc.yaml
>>
>> The filename should be "mediatek,mt8196-dramc.yaml"
>>
> 
> For other MediaTek SOCs, the method of calculating current ddr data
> rate is similar to that of MT8196. After changing "mediatek,dramc.yaml"
> to "mediatek,mt8196-dramc.yaml", would future Mediatek SOCs need to add
> a separate yaml file again? or could they reuse mediatek,mt8196-
> dramc.yaml? Thank you for your guidance.
> 

Other MediaTek SoC will be able to reuse mediatek,mt8196-dramc.yaml if the
hardware is similar.

Cheers,
Angelo

> Best regards,
> Crystal
> 
>>
>>> @@ -0,0 +1,44 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +# Copyright (c) 2025 MediaTek Inc.
>>> +%YAML 1.2
>>> +---
>>> +$id:
>>> https://urldefense.com/v3/__http://devicetree.org/schemas/memory-controllers/mediatek,dramc.yaml*__;Iw!!CTRNKA9wMg0ARbw!gH5hMTJ34ZcYfNMfLUNL-dH9SMyQGr06kJ4jij1anezByF7IBOSbkYNdqysgHoz-rSRNwM9r6RaaTC1MO2882ojif26oaBzg$
>>> +$schema:
>>> https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!gH5hMTJ34ZcYfNMfLUNL-dH9SMyQGr06kJ4jij1anezByF7IBOSbkYNdqysgHoz-rSRNwM9r6RaaTC1MO2882ojifw8f6sUH$
>>> +
>>> +title: MediaTek DRAM Controller (DRAMC)
>>> +
>>> +maintainers:
>>> +  - Crystal Guo <crystal.guo@...iatek.com>
>>> +
>>> +description:
>>> +  A MediaTek DRAM controller interface to provide the current data
>>> rate of DRAM.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    items:
>>> +      - enum:
>>> +          - mediatek,mt8196-dramc
>>
>> P.S.: bindings maintainers: this driver is expected to get more
>> compatibles soon.
>>
>> Cheers,
>> Angelo
>>
>>
>>> +
>>> +  reg:
>>> +    items:
>>> +      - description: anaphy registers
>>> +      - description: ddrphy registers
>>> +
>>> +additionalProperties: false
>>> +
>>> +required:
>>> +  - compatible
>>> +  - reg
>>> +
>>> +examples:
>>> +  - |
>>> +    soc {
>>> +        #address-cells = <2>;
>>> +        #size-cells = <2>;
>>> +
>>> +        memory-controller@...36000 {
>>> +            compatible = "mediatek,mt8196-dramc";
>>> +            reg = <0 0x10236000 0 0x2000>,
>>> +                  <0 0x10238000 0 0x2000>;
>>> +        };
>>> +    };
>>
>>