linux-kernel - Re: [PATCH v6 1/4] dt-bindings: misc: qcom,fastrpc: Add compatible for Kaanapali

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Message-ID: <20251211154139.GA1424272-robh@kernel.org>
Date: Thu, 11 Dec 2025 09:41:39 -0600
From: Rob Herring <robh@...nel.org>
To: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
Cc: kpallavi@....qualcomm.com, srini@...nel.org, amahesh@....qualcomm.com,
	arnd@...db.de, gregkh@...uxfoundation.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, quic_bkumar@...cinc.com,
	ekansh.gupta@....qualcomm.com, linux-kernel@...r.kernel.org,
	quic_chennak@...cinc.com, dri-devel@...ts.freedesktop.org,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	jingyi.wang@....qualcomm.com, aiqun.yu@....qualcomm.com,
	ktadakam@....qualcomm.com
Subject: Re: [PATCH v6 1/4] dt-bindings: misc: qcom,fastrpc: Add compatible
 for Kaanapali

On Thu, Dec 11, 2025 at 03:39:30PM +0530, Kumari Pallavi wrote:
> Kaanapali introduces changes in DSP IOVA layout and CDSP DMA addressing
> that differ from previous SoCs. The SID field moves within the physical
> address, and CDSP now supports a wider DMA range, requiring updated
> sid_pos and DMA mask handling in the driver.
> 
> Signed-off-by: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
> ---
>  Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
> index 3f6199fc9ae6..142309e2c656 100644
> --- a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
> +++ b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
> @@ -18,7 +18,12 @@ description: |
>  
>  properties:
>    compatible:
> -    const: qcom,fastrpc
> +    oneOf:
> +      - items:
> +          - enum:
> +              - qcom,kaanapali-fastrpc
> +          - const: qcom,fastrpc

Does the driver work at all on this platform without the changes in this 
series? If not, then it is not compatible with "qcom,fastrpc" as you 
say here.

Rob