Downstream kernels for RB3 Gen2 don't specify the RMTFS address, instead
the kernel is supposed to allocate rmtfs buffers dynamically. The
upstream kernel doesn't support dynamic allocation of RMTFS buffers, so
use the fixed allocation. The RMTFS node (and corresponding interface)
is required for the modem DSP to work (which otherwise would crash).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
index ceb68a890bf4..37a3b51323ce 100644
--- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
+++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
@@ -165,6 +165,15 @@ debug_vm_mem: debug-vm@d0600000 {
 			reg = <0x0 0xd0600000 0x0 0x100000>;
 			no-map;
 		};
+
+		rmtfs_mem: memory@f8500000 {
+			compatible = "qcom,rmtfs-mem";
+			reg = <0x0 0xf8500000 0x0 0x600000>;
+			no-map;
+
+			qcom,client-id = <1>;
+			qcom,vmid = <QCOM_SCM_VMID_MSS_MSA>, <QCOM_SCM_VMID_NAV>;
+		};
 	};
 
 	gpio-keys {

---
base-commit: 80dd246accce631c328ea43294e53b2b2dd2aa32
change-id: 20260520-rb3g2-rmtfs-ipa-e41e93f5047b

Best regards,
--  
With best wishes
Dmitry

On Wed, 20 May 2026 12:54:37 +0300, Dmitry Baryshkov wrote:
> Downstream kernels for RB3 Gen2 don't specify the RMTFS address, instead
> the kernel is supposed to allocate rmtfs buffers dynamically. The
> upstream kernel doesn't support dynamic allocation of RMTFS buffers, so
> use the fixed allocation. The RMTFS node (and corresponding interface)
> is required for the modem DSP to work (which otherwise would crash).
> 
> 
> [...]

Applied, thanks!

[1/1] arm64: dts: qcom: qcs6490-rb3gen2: add rmtfs node
      commit: f6dd5665d8e525484c2d0ebdb7004319024ee640

Best regards,
-- 
Bjorn Andersson <andersson@kernel.org>

On 5/20/26 11:54 AM, Dmitry Baryshkov wrote:
> Downstream kernels for RB3 Gen2 don't specify the RMTFS address, instead
> the kernel is supposed to allocate rmtfs buffers dynamically. The
> upstream kernel doesn't support dynamic allocation of RMTFS buffers, so
> use the fixed allocation. The RMTFS node (and corresponding interface)
> is required for the modem DSP to work (which otherwise would crash).
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> index ceb68a890bf4..37a3b51323ce 100644
> --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> @@ -165,6 +165,15 @@ debug_vm_mem: debug-vm@d0600000 {
>  			reg = <0x0 0xd0600000 0x0 0x100000>;
>  			no-map;
>  		};
> +
> +		rmtfs_mem: memory@f8500000 {
> +			compatible = "qcom,rmtfs-mem";
> +			reg = <0x0 0xf8500000 0x0 0x600000>;
> +			no-map;
> +
> +			qcom,client-id = <1>;
> +			qcom,vmid = <QCOM_SCM_VMID_MSS_MSA>, <QCOM_SCM_VMID_NAV>;


Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad