linux-kernel - Re: [PATCH 2/2] dt-bindings: imx6q-pcie: add "fsl,pcie-phy-refclk-internal" for i.MX7D

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Date:   Wed, 28 Aug 2019 09:17:07 +0100
From:   André Draszik <git@...red.net>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Richard Zhu <hongxing.zhu@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: imx6q-pcie: add
 "fsl,pcie-phy-refclk-internal" for i.MX7D

Hi Rob,

On Tue, 2019-08-27 at 10:56 -0500, Rob Herring wrote:
> On Tue, Aug 13, 2019 at 11:37:59AM +0100, André Draszik wrote:
> > The i.MX7D variant of the IP can use either an external
> > crystal oscillator input or an internal clock input as
> > a reference clock input for the PCIe PHY.
> > 
> > Document the optional property 'fsl,pcie-phy-refclk-internal'
> > 
> > Signed-off-by: André Draszik <git@...red.net>
> > Cc: Richard Zhu <hongxing.zhu@....com>
> > Cc: Lucas Stach <l.stach@...gutronix.de>
> > Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Cc: Mark Rutland <mark.rutland@....com>
> > Cc: Shawn Guo <shawnguo@...nel.org>
> > Cc: Sascha Hauer <s.hauer@...gutronix.de>
> > Cc: Pengutronix Kernel Team <kernel@...gutronix.de>
> > Cc: Fabio Estevam <festevam@...il.com>
> > Cc: NXP Linux Team <linux-imx@....com>
> > Cc: linux-pci@...r.kernel.org
> > Cc: linux-arm-kernel@...ts.infradead.org
> > Cc: devicetree@...r.kernel.org
> > Cc: linux-kernel@...r.kernel.org
> > ---
> >  Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > index a7f5f5afa0e6..985d7083df9f 100644
> > --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > @@ -56,6 +56,11 @@ Additional required properties for imx7d-pcie and imx8mq-pcie:
> >  	       - "turnoff"
> >  - fsl,imx7d-pcie-phy: A phandle to an fsl,imx7d-pcie-phy node.
> 
> Not sure how this got in, but why is the phy binding not used here?
> 
> >  
> > +Additional optional properties for imx7d-pcie:
> > +- fsl,pcie-phy-refclk-internal: If present then an internal PLL input is used
> > +  as PCIe PHY reference clock source. By default an external ocsillator input
> > +  is used.
> 
> Can't the clock binding and maybe 'assigned-clocks' be used here? 
> 
> Also, this is a property of the PHY, so it belongs in the PHY's node.

Thanks for pointing this out. I'll have a look.

Andre'