linux-kernel - Re: [PATCH] dt-bindings: usb: dwc3-xilinx: allow dma-coherent

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Message-ID: <20250527192633.GA1084631-robh@kernel.org>
Date: Tue, 27 May 2025 14:26:33 -0500
From: Rob Herring <robh@...nel.org>
To: Conor Dooley <conor@...nel.org>
Cc: Radhey Shyam Pandey <radhey.shyam.pandey@....com>,
	gregkh@...uxfoundation.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	michal.simek@....com, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, git@....com
Subject: Re: [PATCH] dt-bindings: usb: dwc3-xilinx: allow dma-coherent

On Fri, May 16, 2025 at 03:16:02PM +0100, Conor Dooley wrote:
> On Fri, May 16, 2025 at 06:48:36PM +0530, Radhey Shyam Pandey wrote:
> > On Versal Gen 2 SoC the LPD USB DMA controller is coherent with the CPU
> > so allow specifying the information.
> 
> Sounds like it should actually be marked required on this platform, no?

Should still work without it, just more overhead of unnecessary cache 
flushes.

Rob