linux-kernel - RE: [PATCHv4 1/3] ARMv8: dts: ls1046a: add the property of IB and OB

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Date:   Fri, 10 Nov 2017 21:20:31 +0000
From:   Leo Li <leoyang.li@....com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Xiaowei Bao <xiaowei.bao@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Madalin-cristian Bucur <madalin.bucur@....com>,
        Sumit Garg <sumit.garg@....com>, "Y.b. Lu" <yangbo.lu@....com>,
        Andy Tang <andy.tang@....com>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "pbrobinson@...il.com" <pbrobinson@...il.com>,
        "songxiaowei@...ilicon.com" <songxiaowei@...ilicon.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "Z.q. Hou" <zhiqiang.hou@....com>,
        "Mingkai Hu" <mingkai.hu@....com>,
        "M.h. Lian" <minghuan.lian@....com>
Subject: RE: [PATCHv4 1/3] ARMv8: dts: ls1046a: add the property of IB and OB



> -----Original Message-----
> From: Kishon Vijay Abraham I [mailto:kishon@...com]
> Sent: Friday, November 10, 2017 12:22 AM
> To: Xiaowei Bao <xiaowei.bao@....com>; robh+dt@...nel.org;
> mark.rutland@....com; catalin.marinas@....com; will.deacon@....com;
> bhelgaas@...gle.com; shawnguo@...nel.org; Madalin-cristian Bucur
> <madalin.bucur@....com>; Sumit Garg <sumit.garg@....com>; Y.b. Lu
> <yangbo.lu@....com>; hongtao.jia@....com; Andy Tang
> <andy.tang@....com>; Leo Li <leoyang.li@....com>; jingoohan1@...il.com;
> pbrobinson@...il.com; songxiaowei@...ilicon.com;
> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> kernel@...r.kernel.org; linux-pci@...r.kernel.org; linuxppc-
> dev@...ts.ozlabs.org; Z.q. Hou <zhiqiang.hou@....com>; Mingkai Hu
> <mingkai.hu@....com>; M.h. Lian <minghuan.lian@....com>
> Subject: Re: [PATCHv4 1/3] ARMv8: dts: ls1046a: add the property of IB and OB
> 
> Hi Bao,
> 
> On Friday 10 November 2017 09:18 AM, Bao Xiaowei wrote:
> > Add the property of inbound and outbound windows number for ep driver.
> >
> > Signed-off-by: Bao Xiaowei <xiaowei.bao@....com>
> > Acked-by: Minghuan Lian <minghuan.Lian@....com>
> > ---
> >  v2:
> >  - no change
> >  v3:
> >  - modify the commit message
> >  v4:
> >  - no change
> >
> >  arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi | 6 ++++++
> >  1 file changed, 6 insertions(+)
> 
> $subject should start with something like
> arm64: dts: ls1046a: **
> >
> > diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi
> > b/arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi
> > index 06b5e12d04d8..f8332669663c 100644
> > --- a/arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi
> > @@ -674,6 +674,8 @@
> >  			device_type = "pci";
> >  			dma-coherent;
> >  			num-lanes = <4>;
> > +			num-ib-windows = <6>;
> > +			num-ob-windows = <6>;
> 
> EP specific properties shouldn't be added in RC dt node. Ideally you should have
> a separate dt node for RC and EP.

It is a single PCIe controller which can be configured to either RC mode or EP mode.  Wouldn't it conflict with the device tree principles to have two device tree nodes for the same PCIe controller?  And obviously the two modes cannot be used at the same time so we cannot have two drivers both probe on the same hardware.

Regards,
Leo