[PATCH] arm64: dts: amlogic: Fix GIC register ranges for Amlogic T7

[Neil Armstrong]

On 3/5/26 23:11, Ronald Claveau wrote:
> This patch aims to fix the GIC register ranges for Amlogic T7 SoC family.
> 
> - Context
> Kernel log shows a warning about GIC
> [    0.000000] GIC: GICv2 detected, but range too small and irqchip.gicv2_force_probe not set
> 
> Using cat /proc/interrupts command shows GIC as GIC-0
> 
> Adding some peripherals sometimes causes hangs on interrupts.
> 
> - According to the GIC-400 ARM doc, the memory map is like:
> 0x1000-0x1FFF Distributor
> 0x2000-0x3FFF CPU interfaces
> 0x4000-0x5FFF Virtual interface control block
> 0x6000-0x7FFF Virtual CPU interfaces
> 
> - Identify GIC model from distributor register
> 
> Offset | Name | Type | Reset
> 0x008 | GICD_IIDR | RO | 0x0200143B
> 
> kvim4# md.l 0xFFF01008 1
> fff01008: 0200143b
> 
> - Identify CPU interface from CPU interface register
> 
> Offset | Name | Type | Reset
> 0x00FC | GICC_IIDR | RO | 0x0202143B
> 
> kvim4# md.l 0xFFF020FC 1
> fff020fc: 0202143b
> 
> - Virtual interface control register check
> 
> Offset | Name | Type | Reset
> 0x004 | GICH_VTR | RO | 0x90000003
> 
> kvim4# md.l 0xFFF04004 1
> fff04004: 90000003
> 
> - Virtual CPU interfaces check
> 
> Offset | Name | Type | Reset
> 0x00FC | GICV_IIDR | RO | 0x0202143B
> 
> kvim4# md.l 0xFFF060FC 1
> fff060fc: 0202143b
> 
> - After this patch there is no warning anymore.
> GICv2 is correctly identified.
> 
> [    0.000000] GIC: Using split EOI/Deactivate mode
> 
> Using cat /proc/interrupts command shows GIC as GICv2
> 
> Signed-off-by: Ronald Claveau <linux-kernel-dev at aliel.fr>
> ---
>   arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi b/arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi
> index 6510068bcff92..d523cbc0ed22a 100644
> --- a/arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi
> @@ -213,7 +213,9 @@ gic: interrupt-controller at fff01000 {
>   			#address-cells = <0>;
>   			interrupt-controller;
>   			reg = <0x0 0xfff01000 0 0x1000>,
> -			      <0x0 0xfff02000 0 0x0100>;
> +			      <0x0 0xfff02000 0 0x2000>,
> +			      <0x0 0xfff04000 0 0x2000>,
> +			      <0x0 0xfff06000 0 0x2000>;
>   			interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_HIGH)>;
>   		};
>   
> 
> ---
> base-commit: c025f6cf4209e1542ec2afebe49f42bbaf1a5c7b
> change-id: 20260303-fix-amlt7-gic-dts-7dcc93e13612
> 
> Best regards,

Reviewed-by: Neil Armstrong <neil.armstrong at linaro.org>

Thanks,
Neil