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: <20180829004122.GA25928@bogus>
Date:   Tue, 28 Aug 2018 19:41:22 -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-pci@...r.kernel.org,
        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 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