linux-kernel - Re: [PATCH v3 1/7] dt-bindings: pci: xilinx-nwl: Add phys

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Date: Thu, 23 May 2024 11:19:42 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: Bjorn Helgaas <helgaas@...nel.org>,
	g@...lgaas.smtp.subspace.kernel.org
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kw@...ux.com>,
 Rob Herring <robh@...nel.org>, linux-pci@...r.kernel.org,
 Michal Simek <michal.simek@....com>,
 Thippeswamy Havalige <thippeswamy.havalige@....com>,
 linux-arm-kernel@...ts.infradead.org, Bjorn Helgaas <bhelgaas@...gle.com>,
 linux-kernel@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/7] dt-bindings: pci: xilinx-nwl: Add phys

On 5/22/24 18:28, Bjorn Helgaas wrote:
> On Mon, May 20, 2024 at 10:53:56AM -0400, Sean Anderson wrote:
>> Add phys properties so Linux can power-on/configure the GTR
>> transcievers.
> 
> s/transcievers/transceivers/

I always forget the spelling is backwards on this one

> Possibly s/phys/PHYs/ in subject, commit log, DT description to avoid
> confusion with "phys" (short for generic "physical").  Or maybe even
> just "PHY properties"?

Well, this is the name for the property...

> What does "GTR" mean?  Possibly expand that?

It's "xlnx,zynqmp-psgtr-v1.1". These are the available transceivers on
the ZynqMP, which is the only SoC this device is present on. I had hoped
this would be clear by calling them "GTR transcievers"...

--Sean

>> Signed-off-by: Sean Anderson <sean.anderson@...ux.dev>
>> ---
>> 
>> Changes in v3:
>> - Document phys property
>> 
>> Changes in v2:
>> - Remove phy-names
>> - Add an example
>> 
>>  Documentation/devicetree/bindings/pci/xlnx,nwl-pcie.yaml | 7 +++++++
>>  1 file changed, 7 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/pci/xlnx,nwl-pcie.yaml b/Documentation/devicetree/bindings/pci/xlnx,nwl-pcie.yaml
>> index 426f90a47f35..cc50795d170b 100644
>> --- a/Documentation/devicetree/bindings/pci/xlnx,nwl-pcie.yaml
>> +++ b/Documentation/devicetree/bindings/pci/xlnx,nwl-pcie.yaml
>> @@ -61,6 +61,11 @@ properties:
>>    interrupt-map:
>>      maxItems: 4
>>  
>> +  phys:
>> +    minItems: 1
>> +    maxItems: 4
>> +    description: One phy per logical lane, in order
>> +
>>    power-domains:
>>      maxItems: 1
>>  
>> @@ -110,6 +115,7 @@ examples:
>>    - |
>>      #include <dt-bindings/interrupt-controller/arm-gic.h>
>>      #include <dt-bindings/interrupt-controller/irq.h>
>> +    #include <dt-bindings/phy/phy.h>
>>      #include <dt-bindings/power/xlnx-zynqmp-power.h>
>>      soc {
>>          #address-cells = <2>;
>> @@ -138,6 +144,7 @@ examples:
>>                              <0x0 0x0 0x0 0x3 &pcie_intc 0x3>,
>>                              <0x0 0x0 0x0 0x4 &pcie_intc 0x4>;
>>              msi-parent = <&nwl_pcie>;
>> +            phys = <&psgtr 0 PHY_TYPE_PCIE 0 0>;
>>              power-domains = <&zynqmp_firmware PD_PCIE>;
>>              iommus = <&smmu 0x4d0>;
>>              pcie_intc: legacy-interrupt-controller {
>> -- 
>> 2.35.1.1320.gc452695387.dirty
>>