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: <eabea4d4-366c-491a-bdcf-cbbfede66bd1@ixit.cz>
Date: Mon, 22 Dec 2025 15:01:23 +0100
From: David Heidelberg <david@...t.cz>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 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>,
 Robert Foss <rfoss@...nel.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 18/12/2025 13:25, Konrad Dybcio wrote:
> 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

I don't have any. I'm fine with this patch not getting applied, but I'll 
CC Robert who added the support, maybe he can verify.

David

> 
> Konrad

-- 
David Heidelberg