Re: [PATCH v3 1/2] dt-bindings: phy: qcom: Add CSI2 C-PHY/DPHY schema

From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: Bryan O'Donoghue <bod@nxsw.ie>, Bryan O'Donoghue <bod@kernel.org>,
	Vijay Kumar Tumati <vijay.tumati@oss.qualcomm.com>,
	Bryan O'Donoghue <bryan.odonoghue@linaro.org>,
	Vinod Koul <vkoul@kernel.org>,
	Kishon Vijay Abraham I <kishon@kernel.org>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Neil Armstrong <neil.armstrong@linaro.org>
Cc: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>,
	linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org,
	linux-media@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: phy: qcom: Add CSI2 C-PHY/DPHY schema
Date: Tue, 3 Mar 2026 13:34:30 +0100	[thread overview]
Message-ID: <04f22394-2dbb-4b7b-bce3-9b41ebfb7709@oss.qualcomm.com> (raw)
In-Reply-To: <676e2a9f-d274-40fa-988f-e9388ba40f71@nxsw.ie>

On 3/3/26 10:30 AM, Bryan O'Donoghue wrote:
> On 03/03/2026 09:27, Bryan O'Donoghue wrote:
>> - MXA - first time I've heard of this rail, from memory I don't remember
>>          having seen this in ipcat when I could do so.
> 
> Yeah no MXA isn't a required vote.

That depends on the use case.

MXA is always-on (that's the 'A' in the name, as opposed to 'C'
for 'Collapsible'), but it's not always at the required performance
state (svs, nom, etc.). For some clock controllers specifically, there
is no need to put them into the picture, as the rail may be unconnected
altogether, or only used for some retention mechanisms (which only
require the rail to be enabled and nothing more)

Konrad

> 
> https://lore.kernel.org/linux-arm-msm/9ff1645f-b2c9-4c1a-ae2d-96af416b08d9@oss.qualcomm.com/
> 
> ---
> bod
> 
> 

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