linux-kernel - Re: [PATCH v2 3/6] dt-bindings: PCI: ti,am65: Extend for use with PVU

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Message-ID: <554cb065-6483-42be-bfed-9ed6d3b16fb1@siemens.com>
Date: Tue, 27 Aug 2024 12:44:13 +0200
From: Jan Kiszka <jan.kiszka@...mens.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Nishanth Menon <nm@...com>, Santosh Shilimkar <ssantosh@...nel.org>,
 Vignesh Raghavendra <vigneshr@...com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 Siddharth Vadapalli <s-vadapalli@...com>,
 Bao Cheng Su <baocheng.su@...mens.com>, Hua Qian Li
 <huaqian.li@...mens.com>, Diogo Ivo <diogo.ivo@...mens.com>
Subject: Re: [PATCH v2 3/6] dt-bindings: PCI: ti,am65: Extend for use with PVU

On 27.08.24 08:37, Krzysztof Kozlowski wrote:
> On Mon, Aug 26, 2024 at 11:50:04PM +0200, Jan Kiszka wrote:
>> From: Jan Kiszka <jan.kiszka@...mens.com>
>>
>> Describe also the VMAP registers which are needed in order to make use
>> of the PVU with this PCI host. Furthermore, permit to specify a
>> restricted DMA pool by phandle.
> 
> That's an ABI break without explanation why it is necessary.
> 
>>
>> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
>> ---
>>  .../devicetree/bindings/pci/ti,am65-pci-host.yaml   | 13 ++++++++++---
>>  1 file changed, 10 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml b/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml
>> index 0a9d10532cc8..72f78f21e1e8 100644
>> --- a/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml
>> +++ b/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml
>> @@ -20,7 +20,7 @@ properties:
>>        - ti,keystone-pcie
>>  
>>    reg:
>> -    maxItems: 4
>> +    maxItems: 6
>>  
>>    reg-names:
>>      items:
>> @@ -28,6 +28,8 @@ properties:
>>        - const: dbics
>>        - const: config
>>        - const: atu
>> +      - const: vmap_lp
>> +      - const: vmap_hp
>>  
>>    interrupts:
>>      maxItems: 1
>> @@ -69,6 +71,9 @@ properties:
>>      items:
>>        pattern: '^pcie-phy[0-1]$'
>>  
>> +  memory-region:
>> +    description: phandle to restricted DMA pool to be used for all devices behind this controller
> 
> missing constraints, maxItems
> 

In fact, that was intentional: There could also be multiple region
specified here. The driver already handles this.

Jan

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