Re: [PATCH v5 3/5] arm64: dts: agilex: add dtsi for PCIe Root Port

[Krzysztof Kozlowski <krzk@kernel.org>]

On 29/01/2025 20:42, matthew.gerlach@linux.intel.com wrote:
> 
> 
> On Wed, 29 Jan 2025, Krzysztof Kozlowski wrote:
> 
>> On 27/01/2025 18:35, Matthew Gerlach wrote:
>>> Add the base device tree for support of the PCIe Root Port
>>> for the Agilex family of chips.
>>>
>>> Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
>>> ---
>>> v3:
>>>  - Remove accepted patches from patch set.
>>>
>>> v2:
>>>  - Rename node to fix schema check error.
>>> ---
>>>  .../intel/socfpga_agilex_pcie_root_port.dtsi  | 55 +++++++++++++++++++
>>>  1 file changed, 55 insertions(+)
>>>  create mode 100644 arch/arm64/boot/dts/intel/socfpga_agilex_pcie_root_port.dtsi
>>>
>>> diff --git a/arch/arm64/boot/dts/intel/socfpga_agilex_pcie_root_port.dtsi b/arch/arm64/boot/dts/intel/socfpga_agilex_pcie_root_port.dtsi
>>> new file mode 100644
>>> index 000000000000..50f131f5791b
>>> --- /dev/null
>>> +++ b/arch/arm64/boot/dts/intel/socfpga_agilex_pcie_root_port.dtsi
>>> @@ -0,0 +1,55 @@
>>> +// SPDX-License-Identifier:     GPL-2.0
>>
>> Odd spaces in SPDX tag.
> 
> Yes, there should only be one space.
> 
>>
>>> +/*
>>> + * Copyright (C) 2024, Intel Corporation
>>> + */
>>> +&soc0 {
>>> +	aglx_hps_bridges: fpga-bus@80000000 {
>>> +		compatible = "simple-bus";
>>> +		reg = <0x80000000 0x20200000>,
>>> +		      <0xf9000000 0x00100000>;
>>> +		reg-names = "axi_h2f", "axi_h2f_lw";
>>
>> Where is this binding defined?
> 
> The bindings for these reg-names are not currently defined anywhere, but 

Then you cannot use them.

> they are also referenced in the following:
>      Documentation/devicetree/bindings/soc/intel/intel,hps-copy-engine.yaml
>      arch/arm64/boot/dts/intel/socfpga_agilex_n6000.dts
> I am not exactly sure where the right place is to define them, maybe
> Documentation/devicetree/bindings/arm/intel,socfpga.yaml. On the other 
> hand, no code references these names; so it might make sense to just 
> remove them.

In general: nowhere, because simple bus does not have such properties.
It's not about reg-names only - you cannot have reg. You just did not
define here simple-bus.

Best regards,
Krzysztof