linux-kernel - Re: [PATCH 4/9] arm64: dts: qcom: ipq9574: add wcss remoteproc nodes

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Message-ID: <b67ad9fd-872f-41da-8f97-34a8403f165a@oss.qualcomm.com>
Date: Fri, 19 Dec 2025 14:43:44 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Alexandru Gagniuc <mr.nuke.me@...il.com>, andersson@...nel.org,
        mathieu.poirier@...aro.org, krzk+dt@...nel.org,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/9] arm64: dts: qcom: ipq9574: add wcss remoteproc nodes

On 12/19/25 5:34 AM, Alexandru Gagniuc wrote:
> The WCSS remoteproc is typically used by ath11k to load wifi firmware
> to the Hexagon q6 procesor. Add the nodes required to bring up this
> processor.
> 
> Signed-off-by: Alexandru Gagniuc <mr.nuke.me@...il.com>
> ---

[...]

> +		q6v5_wcss: remoteproc@...0000 {
> +			compatible = "qcom,ipq9574-wcss-pil";
> +			reg = <0x0cd00000 0x4040>,
> +			      <0x004ab000 0x20>;
> +			reg-names = "qdsp6",
> +				    "rmb";

Hmm.. this "rmb" region is really:

0x0 PS_HOLD (write here to reset the chip, if the TZ lets you..)
..
0x8 SSCAON_CONFIG (essentially a syscon which you write to from your driver)
0xc SSCAON_STATUS (same)

But we've been describing things this way for years.. I don't know if it's
worth changing, especially since the rproc driver really assumes this to
be the case

Konrad