linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sm8750: Add adsp fastrpc nodes/support

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Message-ID: <5590fdab-0fa3-4ac0-bcbf-d2cb41be16dc@oss.qualcomm.com>
Date: Tue, 5 Aug 2025 18:51:46 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Alexey Klimov <alexey.klimov@...aro.org>, andersson@...nel.org,
        konradybcio@...nel.org, linux-arm-msm@...r.kernel.org
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        srini@...nel.org, quic_ekangupt@...cinc.com,
        krzysztof.kozlowski@...aro.org, dmitry.baryshkov@....qualcomm.com
Subject: Re: [PATCH v2] arm64: dts: qcom: sm8750: Add adsp fastrpc
 nodes/support

On 8/5/25 6:20 PM, Alexey Klimov wrote:
> While at this, also add required memory region for adsp fastrpc.
> 
> Tested on sm8750-mtp device with adsprpdcd.
> 
> Cc: Ekansh Gupta <quic_ekangupt@...cinc.com>
> Cc: Srinivas Kandagatla <srini@...nel.org>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Signed-off-by: Alexey Klimov <alexey.klimov@...aro.org>
> ---
> 
> v2:
> - removed qcom,non-secure-domain flag as requested by Srini.
> 
> Prev version: https://lore.kernel.org/linux-arm-msm/20250502011539.739937-1-alexey.klimov@linaro.org/
> 
>  arch/arm64/boot/dts/qcom/sm8750.dtsi | 69 ++++++++++++++++++++++++++++
>  1 file changed, 69 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8750.dtsi b/arch/arm64/boot/dts/qcom/sm8750.dtsi
> index 4643705021c6..cc74fb2e27de 100644
> --- a/arch/arm64/boot/dts/qcom/sm8750.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8750.dtsi
> @@ -7,6 +7,7 @@
>  #include <dt-bindings/clock/qcom,sm8750-gcc.h>
>  #include <dt-bindings/clock/qcom,sm8750-tcsr.h>
>  #include <dt-bindings/dma/qcom-gpi.h>
> +#include <dt-bindings/firmware/qcom,scm.h>
>  #include <dt-bindings/gpio/gpio.h>
>  #include <dt-bindings/interconnect/qcom,icc.h>
>  #include <dt-bindings/interconnect/qcom,sm8750-rpmh.h>
> @@ -523,6 +524,14 @@ llcc_lpi_mem: llcc-lpi@...00000 {
>  			reg = <0x0 0xff800000 0x0 0x800000>;
>  			no-map;
>  		};
> +
> +		adsp_rpc_remote_heap_mem: adsp-rpc-remote-heap {
> +			compatible = "shared-dma-pool";
> +			alloc-ranges = <0x0 0x00000000 0x0 0xffffffff>;

perhaps size=<0x1 0x0> (1<<32) is what we really want, unless the hw/sw
is allergic to accessing the very last byte in the 32-bit space

Konrad