linux-kernel - Re: [PATCH v3 0/3] usb: dwc3: add layerscape platform driver use flatten dwc3 core

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Message-ID: <aNasaARTt0gusNVu@lizhi-Precision-Tower-5810>
Date: Fri, 26 Sep 2025 11:08:24 -0400
From: Frank Li <Frank.li@....com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Shawn Guo <shawnguo@...nel.org>
Cc: linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	bjorn.andersson@....qualcomm.com, imx@...ts.linux.dev,
	Ze Huang <huang.ze@...ux.dev>
Subject: Re: [PATCH v3 0/3] usb: dwc3: add layerscape platform driver use
 flatten dwc3 core

On Fri, Sep 26, 2025 at 11:05:47AM -0400, Frank Li wrote:
> Add layerscape platform driver use flatten dwc3 core to enable dma-coherence.
> It needs set gsburstcfg0 to 0x2222.

Sorry, please forget this patches, I sent accidently.

Frank

>
> There are some several try before:
> [1] https://lore.kernel.org/imx/20240710-ls-dwc-v1-0-62f8cbed31d7@nxp.com/
> [2] https://lore.kernel.org/imx/20240123170206.3702413-1-Frank.Li@nxp.com/
>
> [2]: add new property, which was reject because there are no varience in
> the soc. Fortunately the below commit resolve this problem by use software
> managed property.
>
> d504bfa6cfd1a usb: dwc3: enable CCI support for AMD-xilinx DWC3 controller
>
> [1] was reject because there are not actually dwc wrap at layerscape
> platform. Fortunately Bjorn Andersson's below patch to make it possible
> by use correct dts dwc3 node layer out.
>
> 613a2e655d4dc usb: dwc3: core: Expose core driver as library
>
> This resolve problem [1] and [2] by use flatten dwc3 core library.
>
> 1. add soc specific compatible string at dt-binding.
> 2. create platform driver for layerscape chips and pass down gsbuscfg0 if
> dma-coherence enabled.
> 3. update layerscape dts files.
>
> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> To: Rob Herring <robh@...nel.org>
> To: Krzysztof Kozlowski <krzk+dt@...nel.org>
> To: Conor Dooley <conor+dt@...nel.org>
> To: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
> To: Shawn Guo <shawnguo@...nel.org>
> Cc: linux-usb@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: bjorn.andersson@....qualcomm.com
> Cc: imx@...ts.linux.dev
>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> Changes in v3:
> - rename gsbuscfg0 to gsbuscfg0_reqinfo
> - Link to v2: https://lore.kernel.org/r/20250923-ls_dma_coherence-v2-0-ce3176396bdb@nxp.com
>
> Changes in v2:
> - base on drivers/usb/dwc3/dwc3-generic-plat.c
>
> commit e0b6dc00c701e600e655417aab1e100b73de821a
> Author: Ze Huang <huang.ze@...ux.dev>
> Date:   Sat Sep 13 00:53:48 2025 +0800
>
>     usb: dwc3: add generic driver to support flattened
>
>     To support flattened dwc3 dt model and drop the glue layer, introduce the
>     `dwc3-generic` driver. This enables direct binding of the DWC3 core driver
>     and offers an alternative to the existing glue driver `dwc3-of-simple`.
>
> - Link to v1: https://lore.kernel.org/r/20250602-ls_dma_coherence-v1-0-c67484d6ab64@nxp.com
>
> ---
> Frank Li (3):
>       dt-bindings: usb: add missed compatible string for arm64 layerscape
>       usb: dwc3: dwc3-generic-plat: add layerscape dwc3 support
>       arm64: dts: layerscape: add dma-coherent for usb node
>
>  .../devicetree/bindings/usb/fsl,ls1028a.yaml       | 33 ++++++++++++----------
>  arch/arm64/boot/dts/freescale/fsl-ls1012a.dtsi     |  3 +-
>  arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi     |  8 ++++--
>  arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi     |  9 ++++--
>  arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi     |  9 ++++--
>  arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi     |  8 ++++--
>  arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi     |  8 ++++--
>  drivers/usb/dwc3/dwc3-generic-plat.c               | 33 +++++++++++++++++++++-
>  8 files changed, 82 insertions(+), 29 deletions(-)
> ---
> base-commit: c45d2c21b3889c520bf141d576eaecb25666895c
> change-id: 20250602-ls_dma_coherence-c3c2b6f79db2
>
> Best regards,
> --
> Frank Li <Frank.Li@....com>
>