linux-kernel - RE: [PATCH v5 0/8] Add the imx8m pcie phy driver and imx8mm pcie support

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Message-ID: <AS8PR04MB86760660BD24E4C2BD98F6318C999@AS8PR04MB8676.eurprd04.prod.outlook.com>
Date:   Tue, 16 Nov 2021 01:40:25 +0000
From:   Hongxing Zhu <hongxing.zhu@....com>
To:     "tharvey@...eworks.com" <tharvey@...eworks.com>
CC:     Lucas Stach <l.stach@...gutronix.de>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        Rob Herring <robh@...nel.org>,
        "galak@...nel.crashing.org" <galak@...nel.crashing.org>,
        Shawn Guo <shawnguo@...nel.org>,
        "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        Device Tree Mailing List <devicetree@...r.kernel.org>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH v5 0/8] Add the imx8m pcie phy driver and imx8mm pcie
 support


> -----Original Message-----
> From: Tim Harvey <tharvey@...eworks.com>
> Sent: Tuesday, November 16, 2021 6:56 AM
> To: Hongxing Zhu <hongxing.zhu@....com>
> Cc: Lucas Stach <l.stach@...gutronix.de>; Marcel Ziswiler
> <marcel.ziswiler@...adex.com>; Kishon Vijay Abraham I
> <kishon@...com>; vkoul@...nel.org; Rob Herring <robh@...nel.org>;
> galak@...nel.crashing.org; Shawn Guo <shawnguo@...nel.org>;
> linux-phy@...ts.infradead.org; Device Tree Mailing List
> <devicetree@...r.kernel.org>; Linux ARM Mailing List
> <linux-arm-kernel@...ts.infradead.org>; open list
> <linux-kernel@...r.kernel.org>; Sascha Hauer <kernel@...gutronix.de>;
> dl-linux-imx <linux-imx@....com>
> Subject: Re: [PATCH v5 0/8] Add the imx8m pcie phy driver and imx8mm
> pcie support
> 
> On Mon, Nov 1, 2021 at 7:58 PM Richard Zhu <hongxing.zhu@....com>
> 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://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpa
> tc
> >
> hwork.ozlabs.org%2Fproject%2Flinux-pci%2Fpatch%2F20210510141509.
> 929120
> >
> -3-l.stach%40pengutronix.de%2F&amp;data=04%7C01%7Chongxing.zhu
> %40nxp.c
> >
> om%7C489971db9c0f4308600208d9a88b2b05%7C686ea1d3bc2b4c6fa9
> 2cd99c5c3016
> >
> 35%7C0%7C0%7C637726137953234928%7CUnknown%7CTWFpbGZsb3d
> 8eyJWIjoiMC4wLj
> >
> AwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&
> amp;sdata=
> >
> ltuNZqIAsEH6%2B1KE4cqNOiUul3Ex%2BWmYcyqD%2BFJuUrs%3D&amp;
> reserved=0
> > [2]
> >
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpa
> tc
> >
> hwork.kernel.org%2Fproject%2Flinux-arm-kernel%2Fcover%2F20210910
> 202640
> > .980366-1-l.stach%40pengutronix.de%2F&amp;data=04%7C01%7Chon
> gxing.zhu%
> >
> 40nxp.com%7C489971db9c0f4308600208d9a88b2b05%7C686ea1d3bc2
> b4c6fa92cd99
> >
> c5c301635%7C0%7C0%7C637726137953234928%7CUnknown%7CTWFp
> bGZsb3d8eyJWIjo
> >
> iMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%
> 7C3000&amp
> > ;sdata=MrT3Re3YttE9AoqmGHksTqt4jF4vitRPz5lkgpZqSZ4%3D&amp;res
> erved=0
> >
> > 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 |  95
> ++++++++++++++++++++++++++++++++
> > 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, 528 insertions(+), 8 deletions(-)
> >
> > [PATCH v5 1/8] dt-bindings: phy: phy-imx8-pcie: Add binding for the
> > [PATCH v5 2/8] dt-bindings: phy: Add imx8 pcie phy driver support
> > [PATCH v5 3/8] dt-bindings: imx6q-pcie: Add PHY phandles and name
> > [PATCH v5 4/8] arm64: dts: imx8mm: Add the pcie phy support [PATCH
> v5
> > 5/8] phy: freescale: pcie: Initialize the imx8 pcie [PATCH v5 6/8]
> > arm64: dts: imx8mm: Add the pcie support [PATCH v5 7/8] arm64: dts:
> > imx8mm-evk: Add the pcie support on imx8mm [PATCH v5 8/8] PCI:
> imx:
> > Add the imx8mm pcie support
> 
> Richard,
> 
> Are you posting a v6 of this series or have we already missed the window
> for 5.16?
[Richard Zhu] Hi Tim:
Thanks for your kindly reminder.
In my original plan, I prefer to merge the codes refine firstly, then issue
the v6 patch-set after the rebase.
https://patchwork.kernel.org/project/linux-arm-kernel/cover/1635747478-25562-1-git-send-email-hongxing.zhu@nxp.com/
Unfortunately, I don't get ack from Lucas for other four patches.
Anyway, I would post the v6 patch-set immediately after merge Rob's comments.

Best Regards
Richard Zhu
> 
> Best regards,
> 
> Tim