linux-kernel - Re: [PATCH v2 9/9] ARM: dts: qcom: msm8226-samsung-matisse-common: Enable modem

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Message-ID: <Z5dVc9yTynAsPDcZ@linaro.org>
Date: Mon, 27 Jan 2025 10:44:19 +0100
From: Stephan Gerhold <stephan.gerhold@...aro.org>
To: Luca Weiss <luca@...aweiss.eu>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
	Bjorn Andersson <andersson@...nel.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Stephan Gerhold <stephan@...hold.net>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Matti Lehtimäki <matti.lehtimaki@...il.com>,
	linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 9/9] ARM: dts: qcom: msm8226-samsung-matisse-common:
 Enable modem

On Sun, Jan 26, 2025 at 09:57:28PM +0100, Luca Weiss wrote:
> From: Matti Lehtimäki <matti.lehtimaki@...il.com>
> 
> Enable modem remoteproc on samsung,matisse-wifi & matisselte.
> 
> Signed-off-by: Matti Lehtimäki <matti.lehtimaki@...il.com>
> Signed-off-by: Luca Weiss <luca@...aweiss.eu>
> ---
>  arch/arm/boot/dts/qcom/qcom-msm8226-samsung-matisse-common.dtsi | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/qcom/qcom-msm8226-samsung-matisse-common.dtsi b/arch/arm/boot/dts/qcom/qcom-msm8226-samsung-matisse-common.dtsi
> index fbd568c7d6b7415d240aa1a2329d07cf9135274c..4155bfb2136022f2a85d69451c34f06ed2a700ac 100644
> --- a/arch/arm/boot/dts/qcom/qcom-msm8226-samsung-matisse-common.dtsi
> +++ b/arch/arm/boot/dts/qcom/qcom-msm8226-samsung-matisse-common.dtsi
> @@ -225,6 +225,13 @@ &blsp1_uart3 {
>  	status = "okay";
>  };
>  
> +&modem {
> +	mx-supply = <&pm8226_l3>;
> +	pll-supply = <&pm8226_l8>;

Hmmmmm, so I was looking at msm8926.dtsi downstream and it seems to
override the msm8226.dtsi modem/mss definition [1]:

 1. ext-bhs-reg is dropped
 2. vdd_mss-supply is added

This common include seems to cover both apq8026 (matissewifi) and
msm8926 (matisselte).

Do we need to handle this difference?

First time I see such a difference between variants of a single SoC.
Looking at all the overrides in msm8926.dtsi, it seems like they made
quite some rework for the "LTE variant".

Thanks,
Stephan

[1]: https://github.com/GalaxyTab4/android_kernel_samsung_matissewifi/blob/45f97bab323176fead18c8ddc20dc57d979904a3/arch/arm/boot/dts/msm8226/msm8926.dtsi#L32-L40