linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: sdm845-db845c: Use pad fn instead of defining own

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Message-ID: <f86b483d-c674-4901-b2c8-19a535df4234@oss.qualcomm.com>
Date: Thu, 18 Dec 2025 13:25:56 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: david@...t.cz, Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: sdm845-db845c: Use pad fn
 instead of defining own

On 12/17/25 12:39 PM, David Heidelberg via B4 Relay wrote:
> From: David Heidelberg <david@...t.cz>
> 
> Instead of defining own pad function for master clock, pick one offered
> by sdm845 device-tree include.

I'm a little bitter about the wording - the pad function here is "cam_mclk",
whereas what you're doing is inheriting a common pinmux/pincfg node that
refers to that function

[...]

> -		mclk0-pins {
> -			pins = "gpio13";
> -			function = "cam_mclk";
> -
> -			drive-strength = <16>;

This patch changes the drive-strength (16 -> 2 mA)

FWIW it's 2 on reference designs and Sony boards, check your
downstream kernel

Konrad