linux-kernel - Re: [PATCH v2] arm64: dts: qcom: ipq5424: Describe the 4-wire UART SE

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Message-ID: <da6daf53-11de-4ca1-892d-73754adb435f@oss.qualcomm.com>
Date: Wed, 25 Jun 2025 14:14:56 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....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>,
        Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>,
        Viken Dadhaniya <quic_vdadhani@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: qcom: ipq5424: Describe the 4-wire UART SE

On 6/25/25 7:55 AM, Kathiravan Thirumoorthy wrote:
> 
> On 6/24/2025 8:08 PM, Konrad Dybcio wrote:
>> On 6/24/25 11:00 AM, Kathiravan Thirumoorthy wrote:
>>> QUPv3 in IPQ5424 consists of six Serial Engines (SEs). Describe the
>>> first SE, which supports a 4-wire UART configuration suitable for
>>> applications such as HS-UART.
>>>
>>> Note that the required initialization for this SE is not handled by the
>>> bootloader. Therefore, add the SE node in the device tree but keep it
>>> disabled. Enable it once Linux gains support for configuring the SE,
>>> allowing to use in relevant RDPs.
>> Do you mean fw loading support?
> 
> SE0 is minicore, so we don't need to load the FW. But apart from FW , protocol specific configurations to be done in the SE's Image Configuration registers, which is taken care in the patch[1]
> 
> [1] [PATCH v5 0/5] Add support to load QUP SE firmware from <https://lore.kernel.org/linux-arm-msm/20250624095102.1587580-1-viken.dadhaniya@oss.qualcomm.com/T/#m37a6b739c66040cde5b6b0121a03da7ea6715842>

I've heard the 'minicore' or similar name before.. how does it differ
from a "normal" SE? (+Mukesh & Viken)

Konrad