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From: Arnd Bergmann <arnd@arndb.de>
To: Xiaowei Bao <xiaowei.bao@nxp.com>
Cc: Rob Herring <robh@kernel.org>,
	"bhelgaas@google.com" <bhelgaas@google.com>,
	"mark.rutland@arm.com" <mark.rutland@arm.com>,
	"shawnguo@kernel.org" <shawnguo@kernel.org>,
	Leo Li <leoyang.li@nxp.com>, "kishon@ti.com" <kishon@ti.com>,
	"lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	"M.h. Lian" <minghuan.lian@nxp.com>,
	Mingkai Hu <mingkai.hu@nxp.com>, Roy Zang <roy.zang@nxp.com>,
	"kstewart@linuxfoundation.org" <kstewart@linuxfoundation.org>,
	"cyrille.pitchen@free-electrons.com" 
	<cyrille.pitchen@free-electrons.com>,
	"pombredanne@nexb.com" <pombredanne@nexb.com>,
	"shawn.lin@rock-chips.com" <shawn.lin@rock-chips.com>,
	"niklas.cassel@axis.com" <niklas.cassel@axis.com>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH 3/6] PCI: layerscape: Add the EP mode support
Date: Fri, 26 Oct 2018 09:01:19 +0200	[thread overview]
Message-ID: <CAK8P3a3Ty4bRuHiVHY6dh55b1ms8z7RpG2sALM0Dn_8Yd39-xQ@mail.gmail.com> (raw)
In-Reply-To: <HE1PR04MB149735C7EF2A23AEE982BB9FF5F00@HE1PR04MB1497.eurprd04.prod.outlook.com>

On 10/26/18, Xiaowei Bao <xiaowei.bao@nxp.com> wrote:
> From: Rob Herring <robh@kernel.org>
>> On Thu, Oct 25, 2018 at 07:08:58PM +0800, Xiaowei Bao wrote:
>>>          "fsl,ls2080a-pcie", "fsl,ls2085a-pcie", "snps,dw-pcie"
>>>          "fsl,ls2088a-pcie"
>>>          "fsl,ls1088a-pcie"
>>>          "fsl,ls1046a-pcie"
>>>          "fsl,ls1012a-pcie"
>>> +  EP mode:
>>> +        "fsl,ls-pcie-ep"
>>
> > You need SoC specific compatibles for the same reasons as the RC.
>
> [Xiaowei Bao] I want to contains all layerscape platform use one compatible
> if the PCIe controller work in EP mode.

Do you mean only one of the SoCs that support RC mode has EP mode?
I think you still need a SoC specific compatible as Rob explained, in case
there will be a second one in the future.

If you want to ensure that you don't have to update the device driver
for each new chip that comes in when the EP mode is compatible,
the way this is handled is to list multiple values in the compatible
property, listing the first SoC that introduced the specific version of
that IP block as the most generic type, e.g.

  copatible = "fsl,ls2088a-pcie-ep", "fsl,ls1012a-pcie-ep", "snps,dw-pcie-ep";

For consistency, it probably is best to match each RC mode value with
the corresponding EP mode string for each device that can support both
(if there is more than one).

      Arnd

  reply	other threads:[~2018-10-26  7:01 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-25 11:08 [PATCH 1/6] arm64: dts: Add the status property disable PCIe Xiaowei Bao
2018-10-25 11:08 ` [PATCH 2/6] ARM: dts: ls1021a: " Xiaowei Bao
2018-10-25 11:08 ` [PATCH 3/6] PCI: layerscape: Add the EP mode support Xiaowei Bao
2018-10-25 21:52   ` Rob Herring
2018-10-26  3:45     ` Xiaowei Bao
2018-10-26  7:01       ` Arnd Bergmann [this message]
2018-10-26  7:42         ` Xiaowei Bao
2018-10-26 20:28           ` Li Yang
2018-10-29  2:35             ` Xiaowei Bao
2018-10-25 11:08 ` [PATCH 4/6] arm64: dts: Add the PCIE EP node in dts Xiaowei Bao
2018-10-25 11:09 ` [PATCH 5/6] pci: layerscape: Add the EP mode support Xiaowei Bao
2018-10-26  5:29   ` Kishon Vijay Abraham I
2018-10-26  9:18     ` Xiaowei Bao
2018-10-31  2:33       ` Xiaowei Bao
2018-10-31  4:15         ` Kishon Vijay Abraham I
2018-10-31 10:38           ` Xiaowei Bao
2018-11-05  8:57             ` Kishon Vijay Abraham I
2018-11-05  9:15               ` Xiaowei Bao
2018-11-06  6:06                 ` Kishon Vijay Abraham I
2018-11-06  6:48                   ` Xiaowei Bao
2018-11-09  2:50                     ` Xiaowei Bao
2018-10-25 11:09 ` [PATCH 6/6] misc: pci_endpoint_test: Add the layerscape EP device support Xiaowei Bao

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