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Date:   Sun, 11 Sep 2022 22:14:23 +0300
From:   Serge Semin <fancer.lancer@gmail.com>
To:     Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc:     Serge Semin <Sergey.Semin@baikalelectronics.ru>,
        Rob Herring <robh+dt@kernel.org>,
        Rob Herring <robh@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Jingoo Han <jingoohan1@gmail.com>,
        Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
        Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
        Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>,
        Frank Li <Frank.Li@nxp.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
        linux-pci@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 00/20] PCI: dwc: Add generic resources and Baikal-T1
 support
Message-ID: <20220911191423.byyfljaumy3wv5ay@mobilestation>
References: <20220822184701.25246-1-Sergey.Semin@baikalelectronics.ru>
 <YwyQVAer0YRA406o@lpieralisi>
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On Mon, Aug 29, 2022 at 12:09:24PM +0200, Lorenzo Pieralisi wrote:
> On Mon, Aug 22, 2022 at 09:46:41PM +0300, Serge Semin wrote:
> > This patchset is a third one in the series created in the framework of
> > my Baikal-T1 PCIe/eDMA-related work:
> > 
> > [1: Done v5] PCI: dwc: Various fixes and cleanups
> > Link: https://lore.kernel.org/linux-pci/20220624143428.8334-1-Sergey.Semin@baikalelectronics.ru/
> > Merged: kernel 6.0-rc1
> > [2: Done v4] PCI: dwc: Add hw version and dma-ranges support
> > Link: https://lore.kernel.org/linux-pci/20220624143947.8991-1-Sergey.Semin@baikalelectronics.ru
> > Merged: kernel 6.0-rc1
> > [3: In-review v5] PCI: dwc: Add generic resources and Baikal-T1 support
> > Link: ---you are looking at it---
> > [4: Done v4] dmaengine: dw-edma: Add RP/EP local DMA support
> > Link: https://lore.kernel.org/linux-pci/20220728142841.12305-1-Sergey.Semin@baikalelectronics.ru/
> > 
> > Note it is very recommended to merge the patchsets in the same order as
> > they are listed in the set above in order to have them applied smoothly.
> > Nothing prevents them from being reviewed synchronously though.
> > 
> > Originally the patches submitted in this patchset were a part of the series:
> > Link: https://lore.kernel.org/linux-pci/20220503214638.1895-1-Sergey.Semin@baikalelectronics.ru/
> > but due to the reviewers requests the series was expanded to about 30
> > patches which made it too bulky for a comfortable review. So I decided to
> > split it up into two patchsets: 2. and 3. in the table above.
> > 
> > Regarding the series content. This patchset is mainly about adding new DW
> > PCIe platform support - Baikal-T1 PCIe of DW PCIe v4.60a IP-core. But a
> > set of feature-reach preparations are done first. It starts from
> > converting the currently available DT-schema into a more flexible schemas
> > hierarchy with separately defined regs, clocks, resets and interrupts
> > properties. As a result the common schema can be easily re-used by all the
> > currently available platforms while the named properties above can be
> > either re-defined or used as is if the platforms support they. In the
> > framework of that modification we also suggest to add a set of generic
> > regs, clocks, resets and interrupts resource names in accordance with what
> > the DW PCIe hardware reference manual describes and what the DW PCIe core
> > driver already expects to be specified. Thus the new platform driver will
> > be able to re-use the common resources infrastructure.
> > 
> > Link: https://lore.kernel.org/linux-pci/20220324013734.18234-1-Sergey.Semin@baikalelectronics.ru/
> > Changelog v2:
> > - Rename 'syscon' property to 'baikal,bt1-syscon'. (@Rob)
> > - Move the iATU region selection procedure into a helper function (@Rob).
> > - Rebase from kernel v5.17 onto v5.18-rc3 since the later kernel has
> >   already DT bindings converted. (@Rob)
> > - Use 'definitions' property instead of the '$defs' one. It fixes the
> >   dt-validate error: 'X is not of type array.'
> > - Drop 'interrupts' and 'interrupt-names' property from being required
> >   for the native DW PCIe host.
> > - Evaluate the 'snps,dw-pcie-common.yaml' schema in the
> >   'socionext,uniphier-pcie-ep.yaml' DT-bindings since the later has
> >   platform-specific names defined.
> > 
> > Link: https://lore.kernel.org/linux-pci/20220503225104.12108-1-Sergey.Semin@baikalelectronics.ru
> > Changelog v3:
> > - Split up the patch "dt-bindings: PCI: dwc: Define common and native DT
> >   bindings" into a series of modifications. (@Rob)
> > - Detach this series of the patches into a dedicated patchset.
> > - Add a new feature patch: "PCI: dwc: Introduce generic controller
> >   capabilities interface".
> > - Add a new feature patch: "PCI: dwc: Introduce generic resources getter".
> > - Add a new cleanup patch: "PCI: dwc: Combine iATU detection procedures".
> > - Add a method to at least request the generic clocks and resets. (@Rob)
> > - Add GPIO-based PERST# signal support to the core module.
> > - Redefine Baikal-T1 PCIe host bridge config space accessors with the
> >   pci_generic_config_read32() and pci_generic_config_write32() methods.
> >   (@Rob)
> > - Drop synonymous from the names list in the common DT-schema since the
> >   device sub-schemas create their own enumerations anyway.
> > - Rebase onto kernel v5.18.
> > 
> > Link: https://lore.kernel.org/linux-pci/20220610085706.15741-1-Sergey.Semin@baikalelectronics.ru/
> > Changelog v4:
> > - Drop PCIBIOS_* macros usage. (@Rob)
> > - Add "static const" to the dw_pcie_ops and dw_pcie_host_ops structure
> >   instances. (@Bjorn)
> > - Rename bt1_pcie_dw_ops to bt1_pcie_ops. (@Bjorn)
> > - Rename bt1_pcie_ops to bt1_pci_ops. (@Bjorn)
> > - Use start_link/stop_link suffixes in the Baikal-T1 PCIe
> >   start/stop link callbacks. (@Bjorn)
> > - Change the get_res() method suffix to being get_resources(). (@Bjorn)
> > - Change *_{add,del}_dw_port() method to *_{add,del}_port(). (@Bjorn)
> > - Drop dma_coerce_mask_and_coherent() applied to the PCI host bridge
> >   kernel device instance. (@Bjorn)
> > - Add the comment above the dma_set_mask_and_coherent() method usage
> >   regarding the controller eDMA feature. (@Bjorn)
> > - Fix the comment above the core reset controls assertion. (@Bjorn)
> > - Replace delays and timeout numeric literals with macros. (@Bjorn)
> > - Convert the method name from dw_pcie_get_res() to
> >   dw_pcie_get_resources(). (@Bjorn)
> > - Rebase onto the kernel v5.19-rcX.
> > 
> > Link: https://lore.kernel.org/linux-pci/20220728143427.13617-1-Sergey.Semin@baikalelectronics.ru/
> > Changelog v5:
> > - Add a note about having line-based PHY phandles order. (@Rob)
> > - Prefer 'pcie[0-9]+' PHY-names over the rest of the cases. (@Rob)
> > - Drop generic fallback names from the Baikal-T1 compatible property
> >   constraints. (@Rob)
> > - Define ordered {reg,interrupt,clock,reset}-names Baikal-T1 PCIe
> >   properties. (@Rob)
> > - Drop minItems from the Baikal-T1 PCIe clocks and reset properties,
> >   since it equals to the maxItems for them.
> > - Drop num-ob-windows and num-ib-windows properties constraint from
> >   Baikal-T1 PCIe bindings. (@Rob)
> > - Add a note about having line-based PHY phandles order. (@Rob)
> > - Prefer 'pcie[0-9]+' PHY-names over the rest of the cases. (@Rob)
> > - Add platform-specific reg/interrupt/clock/reset names to the generic
> >   schema, but mark them as deprecated.
> > - Add new patches:
> >   dt-bindings: visconti-pcie: Fix interrupts array max constraints
> >   dt-bindings: imx6q-pcie: Fix clock names for imx6sx and imx8mq
> 

> Are these two new patches linked to the remainder of the series ?

If they weren't I would have submitted them separately. They are
required for the DW PCIe DT-part of the series to work correctly.

-Sergey

> 
> Thanks,
> Lorenzo
> 
> > - Move the patch:
> >   PCI: dwc: Introduce dma-ranges property support for RC-host
> >   from the previous patchset in here. (@Bjorn)
> > - Rebase onto the kernel v6.0-rc2.
> > 
> > Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
> > Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
> > Cc: Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>
> > Cc: "Krzysztof Wilczyński" <kw@linux.com>
> > Cc: Frank Li <Frank.Li@nxp.com>
> > Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > Cc: linux-pci@vger.kernel.org
> > Cc: devicetree@vger.kernel.org
> > Cc: linux-kernel@vger.kernel.org
> > 
> > Serge Semin (20):
> >   dt-bindings: imx6q-pcie: Fix clock names for imx6sx and imx8mq
> >   dt-bindings: visconti-pcie: Fix interrupts array max constraints
> >   dt-bindings: PCI: dwc: Detach common RP/EP DT bindings
> >   dt-bindings: PCI: dwc: Remove bus node from the examples
> >   dt-bindings: PCI: dwc: Add phys/phy-names common properties
> >   dt-bindings: PCI: dwc: Add max-link-speed common property
> >   dt-bindings: PCI: dwc: Apply generic schema for generic device only
> >   dt-bindings: PCI: dwc: Add max-functions EP property
> >   dt-bindings: PCI: dwc: Add interrupts/interrupt-names common
> >     properties
> >   dt-bindings: PCI: dwc: Add reg/reg-names common properties
> >   dt-bindings: PCI: dwc: Add clocks/resets common properties
> >   dt-bindings: PCI: dwc: Add dma-coherent property
> >   dt-bindings: PCI: dwc: Apply common schema to Rockchip DW PCIe nodes
> >   dt-bindings: PCI: dwc: Add Baikal-T1 PCIe Root Port bindings
> >   PCI: dwc: Introduce dma-ranges property support for RC-host
> >   PCI: dwc: Introduce generic controller capabilities interface
> >   PCI: dwc: Introduce generic resources getter
> >   PCI: dwc: Combine iATU detection procedures
> >   PCI: dwc: Introduce generic platform clocks and resets
> >   PCI: dwc: Add Baikal-T1 PCIe controller support
> > 
> >  .../bindings/pci/baikal,bt1-pcie.yaml         | 153 ++++
> >  .../bindings/pci/fsl,imx6q-pcie.yaml          |  47 +-
> >  .../bindings/pci/rockchip-dw-pcie.yaml        |   4 +-
> >  .../bindings/pci/snps,dw-pcie-common.yaml     | 327 +++++++++
> >  .../bindings/pci/snps,dw-pcie-ep.yaml         | 169 +++--
> >  .../devicetree/bindings/pci/snps,dw-pcie.yaml | 236 +++++--
> >  .../bindings/pci/toshiba,visconti-pcie.yaml   |   7 +-
> >  drivers/pci/controller/dwc/Kconfig            |   9 +
> >  drivers/pci/controller/dwc/Makefile           |   1 +
> >  drivers/pci/controller/dwc/pcie-bt1.c         | 653 ++++++++++++++++++
> >  .../pci/controller/dwc/pcie-designware-ep.c   |  30 +-
> >  .../pci/controller/dwc/pcie-designware-host.c |  47 +-
> >  drivers/pci/controller/dwc/pcie-designware.c  | 262 +++++--
> >  drivers/pci/controller/dwc/pcie-designware.h  |  63 +-
> >  14 files changed, 1785 insertions(+), 223 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/pci/baikal,bt1-pcie.yaml
> >  create mode 100644 Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
> >  create mode 100644 drivers/pci/controller/dwc/pcie-bt1.c
> > 
> > -- 
> > 2.35.1
> >