linux-kernel - Re: [PATCH v4 2/7] dt-bindings: PCI: ti,am65: Extend for use with PVU

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Message-ID: <59b921c0-d070-41b9-ba42-96e7b20ef45d@siemens.com>
Date: Wed, 4 Sep 2024 13:47:44 +0200
From: Jan Kiszka <jan.kiszka@...mens.com>
To: Siddharth Vadapalli <s-vadapalli@...com>
Cc: Nishanth Menon <nm@...com>, Santosh Shilimkar <ssantosh@...nel.org>,
 Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-pci@...r.kernel.org, Bao Cheng Su <baocheng.su@...mens.com>,
 Hua Qian Li <huaqian.li@...mens.com>, Diogo Ivo <diogo.ivo@...mens.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kw@...ux.com>,
 Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v4 2/7] dt-bindings: PCI: ti,am65: Extend for use with PVU

On 04.09.24 12:16, Siddharth Vadapalli wrote:
> On Wed, Sep 04, 2024 at 12:00:11PM +0200, Jan Kiszka wrote:
>> From: Jan Kiszka <jan.kiszka@...mens.com>
>>
>> The PVU on the AM65 SoC is capable of restricting DMA from PCIe devices
>> to specific regions of host memory. Add the optional property
>> "memory-regions" to point to such regions of memory when PVU is used.
>>
>> Since the PVU deals with system physical addresses, utilizing the PVU
>> with PCIe devices also requires setting up the VMAP registers to map the
>> Requester ID of the PCIe device to the CBA Virtual ID, which in turn is
>> mapped to the system physical address. Hence, describe the VMAP
>> registers which are optionally unless the PVU shall used for PCIe.
> 
> The last line above seems to be accidentally modified when compared to
> the one at:
> https://lore.kernel.org/r/ada462d5-157a-4e11-ba25-d412a2bb678f@ti.com/
> "Hence, describe the VMAP registers which are optionally
> configured whenever PVU is used for PCIe."
> 
> If you intended to modify it, then the sentence appears distorted.
> 

Yeah, I wanted to make the original sentence clearer but failed:
"...which are optional unless the PVU shall be used for PCIe."

Jan

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