linux-kernel - Re: [PATCH 03/12] dt-bindings: display: mediatek: add EXDMA yaml for MT8196

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Message-ID: <843f2dcee012007572f41df991e52369c1e5ed22.camel@mediatek.com>
Date: Thu, 23 Jan 2025 16:14:18 +0000
From: Paul-pl Chen (陳柏霖) <Paul-pl.Chen@...iatek.com>
To: "robh@...nel.org" <robh@...nel.org>, "krzk@...nel.org" <krzk@...nel.org>
CC: Sunny Shen (沈姍姍) <Sunny.Shen@...iatek.com>,
	Sirius Wang (王皓昱) <Sirius.Wang@...iatek.com>,
	Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Xiandong Wang (王先冬)
	<Xiandong.Wang@...iatek.com>, "linux-mediatek@...ts.infradead.org"
	<linux-mediatek@...ts.infradead.org>, Project_Global_Chrome_Upstream_Group
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	<p.zabel@...gutronix.de>, Singo Chang (張興國)
	<Singo.Chang@...iatek.com>, Jason-JH Lin (林睿祥)
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Subject: Re: [PATCH 03/12] dt-bindings: display: mediatek: add EXDMA yaml for
 MT8196

On Thu, 2025-01-23 at 08:21 +0100, Krzysztof Kozlowski wrote:
> 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> On 23/01/2025 07:11, Paul-pl Chen (陳柏霖) wrote:
> > 
> > Hi Krzysztof
> > 
> > I hope this email finds you well. I have a couple of questions
> > regarding the EXDMA commit patch and decoupling:
> > 
> > 1. Would removing the example from the EXDMA commit patch be
> > sufficient
> > to achieve decoupling for EXDMA YAML and MTK clock/power header?
> 
> No
> 
> > 
> > 2. If removing the example from the EXDMA YAML is not allowed, what
> > alternative changes could we implement to achieve decoupling?
> 
> Don't use the header constants but just some fake phandle.
> 
> 
> 
> Best regards,
> Krzysztof

Hi Krzysztof, 

Once again, thanks for the review and reply. 

SO If we apply Chenyu's suggestion:

+ example:
+	-|

+	soc {
+
+ 		disp_ovl0_exdma2: dma-controller@...50000 {
+		compatible = "mediatek,mt8196-exdma";
+		reg = <0 0x32850000 0 0x1000>;
+		clocks = <13>;
+		power-domains = <12>;
+		mediatek,larb = <88>;
+		iommus = <&mm_smmu 144>;
+		#dma-cells = <1>;
+        };
+    };

Does this work for decoupling?


Best Regards,

Paul