[PATCH v6 0/8] Add the imx8m pcie phy driver and imx8mm pcie support

Thu Dec 2 18:12:37 PST 2021

> -----Original Message-----
> From: Vinod Koul <vkoul at kernel.org>
> Sent: Thursday, December 2, 2021 2:03 PM
> To: Hongxing Zhu <hongxing.zhu at nxp.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>;
> l.stach at pengutronix.de; bhelgaas at google.com; Marcel Ziswiler
> <marcel.ziswiler at toradex.com>; tharvey at gateworks.com;
> kishon at ti.com; robh at kernel.org; galak at kernel.crashing.org;
> shawnguo at kernel.org; linux-phy at lists.infradead.org;
> devicetree at vger.kernel.org; linux-pci at vger.kernel.org;
> linux-arm-kernel at lists.infradead.org; linux-kernel at vger.kernel.org;
> kernel at pengutronix.de; dl-linux-imx <linux-imx at nxp.com>
> Subject: Re: [PATCH v6 0/8] Add the imx8m pcie phy driver and imx8mm
> pcie support
> 
> On 02-12-21, 05:43, Hongxing Zhu wrote:
> > > -----Original Message-----
> > > From: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
> > > Sent: Wednesday, December 1, 2021 8:44 PM
> > > To: Hongxing Zhu <hongxing.zhu at nxp.com>
> > > Cc: l.stach at pengutronix.de; bhelgaas at google.com; Marcel Ziswiler
> > > <marcel.ziswiler at toradex.com>; tharvey at gateworks.com;
> kishon at ti.com;
> > > vkoul at kernel.org; robh at kernel.org; galak at kernel.crashing.org;
> > > shawnguo at kernel.org; linux-phy at lists.infradead.org;
> > > devicetree at vger.kernel.org; linux-pci at vger.kernel.org;
> > > linux-arm-kernel at lists.infradead.org;
> > > linux-kernel at vger.kernel.org; kernel at pengutronix.de; dl-linux-imx
> > > <linux-imx at nxp.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://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&data=04%7C01%7Chongxing.zhu
> > > %40nxp.c
> > > >
> > >
> om%7C3edb11e040e6412cf91108d9b4c85052%7C686ea1d3bc2b4c6fa9
> > > 2cd99c5c3016
> > > >
> > >
> 35%7C0%7C1%7C637739594698843569%7CUnknown%7CTWFpbGZsb3d
> > > 8eyJWIjoiMC4wLj
> > > >
> > >
> AwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&
> > > amp;sdata=
> > > >
> > >
> 5xlZSnBYs1SIIbMnmlQwi0qtfLDgKbueLNjPWIPD1pw%3D&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&data=04%7C01%7C
> hon
> > > gxing.zhu%
> > > >
> > >
> 40nxp.com%7C3edb11e040e6412cf91108d9b4c85052%7C686ea1d3bc2
> > > b4c6fa92cd99
> > > >
> > >
> c5c301635%7C0%7C1%7C637739594698843569%7CUnknown%7CTWFp
> > > bGZsb3d8eyJWIjo
> > > >
> > >
> iMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%
> > > 7C3000&amp
> > > > ;sdata=1388J8dLuKUc6KEUnWj5pLpkaPDC4kTIZFF%2BPTspHZY%3D
> &a
> > > mp;reserved=0
> > > >
> > > > Main changes v5 --> v6:
> > > > - Add "Reviewed-by: Rob Herring <robh at kernel.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 at toradex.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.
> > [Richard Zhu] Hi Lorenzo:
> > First of all, thanks a lot for your kindly help.
> > To my original understand, #1-3 patch had been reviewed by Rob, might
> > be  merged into Rob's dt-binding git repos.
> > Shawn takes dts changes ( #4, #6 and #7). And PHY driver merged by
> > vkoul  or Kishon.
> > In the end, the PCIe changes(#8) are merged into PCIe git repos.
> >
> > I'm appreciated if you pull this whole series although I'm not sure
> > that  you can do it or not.
> > Today, I'm glad to receive vkoul's comments about the PHY driver part.
> > Let me continue refine the PHY driver, send anther version of this
> patch-set.
> > Then, let's figure out what's the best option to merge this series.
> 
> I think phy binding and driver changes should go thru phy tree and pcie
> binding and driver changes thru pcie tree, dt should be picked by
> respective arch tree
[Richard Zhu] Hi Vinod: I'm fine with this option.
Please help to take the phy binding and driver after the review cycle.
Thanks in advanced.

Best regards
Richard
> 
> --
> ~Vinod