linux-kernel - Re: [PATCH 2/3] arm64: dts: rockchip: Fix the mipi port definition for RK3399

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Message-ID: <3acaaf1c-b4ed-47ff-8de5-195a9cfc5338@bootlin.com>
Date: Wed, 18 Jun 2025 16:14:44 +0200
From: Olivier Benjamin <olivier.benjamin@...tlin.com>
To: Diederik de Haas <didi.debian@...ow.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] arm64: dts: rockchip: Fix the mipi port definition
 for RK3399



On 6/18/25 15:50, Diederik de Haas wrote:
> Hi (again),
> 
Hello again, I appreciate you taking the time!
> On Wed Jun 18, 2025 at 12:32 AM CEST, Olivier Benjamin wrote:
>> The RK3399's MIPI DSI has 2 ports: in an out. The definition of
>> the port property necessitates the value of #address-cells to be 1.
>>
>> Signed-off-by: Olivier Benjamin <olivier.benjamin@...tlin.com>
>> ---
>>   arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
>> index 5ebc380a24df86ba7172b0950b89cac56b61c507..5a7341fb6bcb0613af6f3ac31d99355a0f890e89 100644
>> --- a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
>> +++ b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
>> @@ -468,7 +468,7 @@ &mipi_dsi {
>>   
>>   	ports {
>>   		mipi_out: port@1 {
>> -			#address-cells = <0>;
>> +			#address-cells = <1>;
>>   			#size-cells = <0>;
>>   			reg = <1>;
>>   
> 
> In rk3399-base.dtsi there is already a definition for mipi-in and
> mipi-out. AFAICT what this change does is require a reg property on the
> endpoint and I don't think that's correct.
> 
Those definitions do indeed exist in the base DTSI.
> It seems to me that all you need is a mipi_out_panel definition.
> So what I came up with is this:
> 
> ```sh
> $ git diff
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
> index 04ba4c4565d0..b175aeed99e2 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
> @@ -466,18 +466,6 @@ &mipi_dsi {
>   	status = "okay";
>   	clock-master;
> 
> -	ports {
> -		mipi_out: port@1 {
> -			#address-cells = <0>;
> -			#size-cells = <0>;
> -			reg = <1>;
> -
> -			mipi_out_panel: endpoint {
> -				remote-endpoint = <&mipi_in_panel>;
> -			};
> -		};
> -	};
> -
>   	panel@0 {
>   		compatible = "hannstar,hsd060bhw4";
>   		reg = <0>;
> @@ -495,6 +483,12 @@ mipi_in_panel: endpoint {
>   	};
>   };
> 
> +&mipi_out {
> +	mipi_out_panel: endpoint {
> +		remote-endpoint = <&mipi_in_panel>;
> +	};
> +};
> +
>   &pmu_io_domains {
>   	pmu1830-supply = <&vcc_1v8>;
>   	status = "okay";
> ```
> 
Thanks for the suggestion, that looks like it might actually solve the 
issue.
> I don't have a PPP so I can't verify it, but ``make CHECK_DTBS=y W=1
> rockchip/rk3399-pinephone-pro.dtb`` no longer reports issues wrt
> dsi@...60000 (after I also fixed the panel compatible like in patch 1
> and added a LCD1_RST pinctrl definition as indicated in my reply to
> patch 3).
> 
I'll test on my PPP and report back in v2.
> Cheers,
>    Diederik

-- 
Olivier Benjamin, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com