linux-kernel - Re: [PATCH v2 1/2] dt-bindings: PCI: meson: add DT bindings for Amlogic Meson PCIe controller

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Message-ID: <CAL_JsqJPzfp1OimYXa26tEqTexyiuKMeKszveobHN3rKP8+RYQ@mail.gmail.com>
Date:   Thu, 30 Aug 2018 08:59:19 -0500
From:   Rob Herring <robh@...nel.org>
To:     Hanjie Lin <hanjie.lin@...ogic.com>
Cc:     Jerome Brunet <jbrunet@...libre.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Yue Wang <yue.wang@...ogic.com>,
        Kevin Hilman <khilman@...libre.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-pci@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic@...ts.infradead.org,
        Yixun Lan <yixun.lan@...ogic.com>,
        Liang Yang <liang.yang@...ogic.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Qiufang Dai <qiufang.dai@...ogic.com>,
        Jian Hu <jian.hu@...ogic.com>, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: PCI: meson: add DT bindings for
 Amlogic Meson PCIe controller

On Thu, Aug 30, 2018 at 2:37 AM Hanjie Lin <hanjie.lin@...ogic.com> wrote:
>
>
>
> On 2018/8/29 8:41, Rob Herring wrote:
> > On Mon, Aug 27, 2018 at 04:55:20PM +0800, Hanjie Lin wrote:
> >>
> >>
> >> On 2018/8/24 16:22, Jerome Brunet wrote:
> >>> On Fri, 2018-08-24 at 15:36 +0800, Hanjie Lin wrote:
> >>>> From: Yue Wang <yue.wang@...ogic.com>
> >>>>
> >>>> The Amlogic Meson PCIe host controller is based on the Synopsys DesignWare
> >>>> PCI core. This patch adds documentation for the DT bindings in Meson PCIe
> >>>> controller.
> >>>>
> >>>> Signed-off-by: Yue Wang <yue.wang@...ogic.com>
> >>>> Signed-off-by: Hanjie Lin <hanjie.lin@...ogic.com>
> >>>> ---
> >>>>  .../devicetree/bindings/pci/amlogic,meson-pcie.txt | 63 ++++++++++++++++++++++
> >>>>  1 file changed, 63 insertions(+)
> >>>>  create mode 100644 Documentation/devicetree/bindings/pci/amlogic,meson-pcie.txt
> >>>>
> >>>> diff --git a/Documentation/devicetree/bindings/pci/amlogic,meson-pcie.txt b/Documentation/devicetree/bindings/pci/amlogic,meson-pcie.txt
> >>>> new file mode 100644
> >>>> index 0000000..8a831d1
> >>>> --- /dev/null
> >>>> +++ b/Documentation/devicetree/bindings/pci/amlogic,meson-pcie.txt
> >>>> @@ -0,0 +1,63 @@
> >>>> +Amlogic Meson AXG DWC PCIE SoC controller
> >>>> +
> >>>> +Amlogic Meson PCIe host controller is based on the Synopsys DesignWare PCI core.
> >>>> +It shares common functions with the PCIe DesignWare core driver and
> >>>> +inherits common properties defined in
> >>>> +Documentation/devicetree/bindings/pci/designware-pci.txt.
> >>>> +
> >>>> +Additional properties are described here:
> >>>> +
> >>>> +Required properties:
> >>>> +- compatible:
> >>>> +  should contain "amlogic,axg-pcie" to identify the core.
> >>>> +- reg:
> >>>> +  Should contain the configuration address space.
> >>>> +- reg-names: Must be
> >>>> +  - "elbi"        External local bus interface registers
> >>>> +  - "cfg"         Meson specific registers
> >>>> +  - "config"      PCIe configuration space
> >>>> +- reset-gpios: The GPIO to generate PCIe PERST# assert and deassert signal.
> >>>> +- clocks: Must contain an entry for each entry in clock-names.
> >>>> +- clock-names: Must include the following entries:
> >>>> +  - "pclk"       PCIe GEN 100M PLL clock
> >>>> +  - "port"       PCIe_x(A or B) RC clock gate
> >>>> +  - "general"    PCIe Phy clock
> >>>> +  - "mipi"       PCIe_x(A or B) 100M ref clock gate
> >>>> +- resets: phandle to the reset lines.
> >>>> +- reset-names: must contain "phy" and "peripheral"
> >>>> +       - "port" Port A or B reset
> >>>> +       - "apb" APB reset
> >>>
> >>> The above description is not coherent (phy <=> port)
> >>>
> >>
> >> Yes, this should be port and apb here.
> >> We'll integrate phy driver into ctrl driver, and move phy reset to here also.
> >
> > Why? That's the wrong thing to do if they are separate h/w blocks. You
> > can do whatever you like in the drivers, but the DT should reflect the
> > h/w.
> >
> > Rob
> >
> > .
> >
>
> We have the dedicated phy driver which only process reset job,
> and we consider that it's too overkill to do just these things .
> So we will integrate phy reset job into the controller driver int the next version.

What's in the separate register space you had for the phy?

Rob