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@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@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,
-- 
Ronald Claveau <linux-kernel-dev@aliel.fr>

Hi,

On Thu, 05 Mar 2026 23:11:25 +0100, 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
> 
> [...]

Thanks, Applied to https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git (v7.1/arm64-dt)

[1/1] arm64: dts: amlogic: Fix GIC register ranges for Amlogic T7
      https://git.kernel.org/amlogic/c/dbb92c6f1ecd0dcd76a3d1002141f340737f55f2

These changes has been applied on the intermediate git tree [1].

The v7.1/arm64-dt branch will then be sent via a formal Pull Request to the Linux SoC maintainers
for inclusion in their intermediate git branches in order to be sent to Linus during
the next merge window, or sooner if it's a set of fixes.

In the cases of fixes, those will be merged in the current release candidate
kernel and as soon they appear on the Linux master branch they will be
backported to the previous Stable and Long-Stable kernels [2].

The intermediate git branches are merged daily in the linux-next tree [3],
people are encouraged testing these pre-release kernels and report issues on the
relevant mailing-lists.

If problems are discovered on those changes, please submit a signed-off-by revert
patch followed by a corrective changeset.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git
[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
[3] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git

-- 
Neil

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@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@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@linaro.org>

Thanks,
Neil