Re: [PATCH v3 RESEND 3/5] arm64: dts: qcom: Add device tree for Nord SA8797P SoC

[Deepti Jaggi]

On 7/6/2026 6:57 AM, Pavan Kondeti wrote:
> On Tue, May 26, 2026 at 01:12:58PM +0800, Shawn Guo wrote:
>> diff --git a/arch/arm64/boot/dts/qcom/scmi-common.dtsi b/arch/arm64/boot/dts/qcom/scmi-common.dtsi
>> new file mode 100644
>> index 000000000000..0c7ffe9e415c
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/qcom/scmi-common.dtsi
>> @@ -0,0 +1,1918 @@
>> +// SPDX-License-Identifier: BSD-3-Clause
>> +/*
>> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
>> + */
>> +
>> +#include <dt-bindings/interrupt-controller/arm-gic.h>
>> +
>> +&firmware {
>> +	scmi0: scmi-0 {
>> +		compatible = "qcom,scmi-smc";
>> +		arm,smc-id = <0xc6008012>;
>> +		shmem = <&shmem0>;
>> +		interrupts = <GIC_SPI 963 IRQ_TYPE_EDGE_RISING>;
>> +		interrupt-names = "a2p";
> 
> I believe this interrupt source is GearVM firmware via Gunyah's
> doorbell, correct? How do we know that scmi0 instance's interrupt 
> is GIC_SPI#963? Are these assumed to be constant/fixed through out
> the life time of this SoC?

Yes, this interrupt is a Gunyah Rx doorbell VIRQ for SCMI a2p completion
from GearVM to Linux. It is allocated by Gunyah RM from the platform's virtual
IRQ range and patched into the DTB by Linux bootloader at boot stage.
 
> 
>> +		#address-cells = <1>;
>> +		#size-cells = <0>;
>> +		arm,max-msg = <10>;
>> +		arm,max-msg-size = <256>;
>> +		arm,max-rx-timeout-ms = <3000>;
>> +
>> +		status = "disabled";
>> +
>> +		scmi0_pd: protocol@11 {
>> +			reg = <0x11>;
>> +			#power-domain-cells = <1>;
>> +		};
>> +
>> +		scmi0_dvfs: protocol@13 {
>> +			reg = <0x13>;
>> +			#power-domain-cells = <1>;
>> +		};
>> +
>> +		scmi0_rst: protocol@16 {
>> +			reg = <0x16>;
>> +			#reset-cells = <1>;
>> +		};
>> +	};
>> +

Thanks,
Deepti