linux-kernel - Re: [PATCH v6 0/8] Add the imx8m pcie phy driver and imx8mm pcie support

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Message-ID: <20211201124419.GA13080@lpieralisi>
Date:   Wed, 1 Dec 2021 12:44:19 +0000
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Richard Zhu <hongxing.zhu@....com>
Cc:     l.stach@...gutronix.de, bhelgaas@...gle.com,
        marcel.ziswiler@...adex.com, tharvey@...eworks.com, kishon@...com,
        vkoul@...nel.org, robh@...nel.org, galak@...nel.crashing.org,
        shawnguo@...nel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, linux-imx@....com
Subject: Re: [PATCH v6 0/8] Add the imx8m pcie phy driver and imx8mm pcie
 support

On Thu, Nov 18, 2021 at 09:54:41AM +0800, Richard Zhu wrote:
> Refer to the discussion [1] when try to enable i.MX8MM PCIe support,
> one standalone PCIe PHY driver should be seperated from i.MX PCIe
> driver when enable i.MX8MM PCIe support.
> 
> This patch-set adds the standalone PCIe PHY driver suport[1-5], and i.MX8MM
> PCIe support[6-8] to have whole view to review this patch-set.
> 
> The PCIe works on i.MX8MM EVK board based the the blkctrl power driver
> [2] and this patch-set. And tested by Tim and Marcel on the different
> reference clock modes boards.
> 
> [1] https://patchwork.ozlabs.org/project/linux-pci/patch/20210510141509.929120-3-l.stach@pengutronix.de/
> [2] https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210910202640.980366-1-l.stach@pengutronix.de/
> 
> Main changes v5 --> v6:
> - Add "Reviewed-by: Rob Herring <robh@...nel.org>" into #1 and #3 patches.
> - Merge Rob's review comments to the #2 patch.
> 
> Main changes v4 --> v5:
> - Set the AUX_EN always 1b'1, thus it can fix the regression introduced in v4
>   series on Marcel's board.
> - Use the lower-case letter in the devicetreee refer to Marcel's comments.
> _ Since the default value of the deemphasis parameters are zero, only set
>   the deemphasis registers when the input paramters are none zero.
> 
> Main changes v3 --> v4:
> - Update the yaml to fix syntax error, add maxitems and drop description of phy
> - Correct the clock name in PHY DT node.
> - Squash the EVK board relalted dts changes into one patch, and drop the
>   useless dummy clock and gpio suffix in DT nodes.
> - Add board specific de-emphasis parameters as DT properties. Thus each board
>   can specify its actual de-emphasis values.
> - Update the commit log of PHY driver.
> - Remove the useless codes from PCIe driver, since they are moved to PHY driver
> - After the discussion and verification of the CLKREQ# configurations with Tim,
>   agree to add an optional boolean property "fsl,clkreq-unsupported", indicates
>   the CLKREQ# signal is hooked or not in HW designs.
> - Add "Tested-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>" tag, since
>   Marcel help to test the v3 patch-set.
> 
> Main changes v2 --> v3:
> - Regarding Lucas' comments.
>  - to have a whole view to review the patches, send out the i.MX8MM PCIe support too.
>  - move the PHY related bits manipulations of the GPR/SRC to standalone PHY driver.
>  - split the dts changes to SOC and board DT, and use the enum instead of raw value.
>  - update the license of the dt-binding header file.
> 
> Changes v1 --> v2:
> - Update the license of the dt-binding header file to make the license
>   compatible with dts files.
> - Fix the dt_binding_check errors.
> 
> Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml    |   6 +++
> Documentation/devicetree/bindings/phy/fsl,imx8-pcie-phy.yaml |  92 +++++++++++++++++++++++++++++++
> arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi                |  55 +++++++++++++++++++
> arch/arm64/boot/dts/freescale/imx8mm.dtsi                    |  46 +++++++++++++++-
> drivers/pci/controller/dwc/pci-imx6.c                        |  73 ++++++++++++++++++++++---
> drivers/phy/freescale/Kconfig                                |   9 ++++
> drivers/phy/freescale/Makefile                               |   1 +
> drivers/phy/freescale/phy-fsl-imx8m-pcie.c                   | 237 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> include/dt-bindings/phy/phy-imx8-pcie.h                      |  14 +++++
> 9 files changed, 525 insertions(+), 8 deletions(-)

Hi Richard,

I can pull this series into the PCI tree (but not the dts changes
that should be routed elsewhere) or give an ACK for patch 8, please
let me know what's the best option.

Thanks,
Lorenzo

> [PATCH v6 1/8] dt-bindings: phy: phy-imx8-pcie: Add binding for the
> [PATCH v6 2/8] dt-bindings: phy: Add imx8 pcie phy driver support
> [PATCH v6 3/8] dt-bindings: imx6q-pcie: Add PHY phandles and name
> [PATCH v6 4/8] arm64: dts: imx8mm: Add the pcie phy support
> [PATCH v6 5/8] phy: freescale: pcie: Initialize the imx8 pcie
> [PATCH v6 6/8] arm64: dts: imx8mm: Add the pcie support
> [PATCH v6 7/8] arm64: dts: imx8mm-evk: Add the pcie support on imx8mm
> [PATCH v6 8/8] PCI: imx: Add the imx8mm pcie support