From: Rob Herring <robh@kernel.org>
To: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: "Bjorn Helgaas" <bhelgaas@google.com>,
"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
"Jingoo Han" <jingoohan1@gmail.com>,
"Gustavo Pimentel" <gustavo.pimentel@synopsys.com>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
"Serge Semin" <fancer.lancer@gmail.com>,
"Alexey Malahov" <Alexey.Malahov@baikalelectronics.ru>,
"Pavel Parkhomenko" <Pavel.Parkhomenko@baikalelectronics.ru>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Frank Li" <Frank.Li@nxp.com>,
"Manivannan Sadhasivam" <manivannan.sadhasivam@linaro.org>,
linux-pci@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 04/17] dt-bindings: PCI: dwc: Add max-link-speed common property
Date: Wed, 15 Jun 2022 08:55:50 -0600 [thread overview]
Message-ID: <20220615145550.GA1069883-robh@kernel.org> (raw)
In-Reply-To: <20220610085706.15741-5-Sergey.Semin@baikalelectronics.ru>
On Fri, Jun 10, 2022 at 11:56:52AM +0300, Serge Semin wrote:
> In accordance with [1] DW PCIe controllers support up to Gen5 link speed.
> Let's add the max-link-speed property upper bound to 5 then. The DT
> bindings of the particular devices are expected to setup more strict
> constraint on that parameter.
>
> [1] Synopsys DesignWare Cores PCI Express Controller Databook, Version
> 5.40a, March 2019, p. 27
>
> Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
>
> ---
>
> Changelog v3:
> - This is a new patch unpinned from the next one:
> https://lore.kernel.org/linux-pci/20220503214638.1895-2-Sergey.Semin@baikalelectronics.ru/
> by the Rob' request. (@Rob)
> ---
> Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml | 3 +++
> Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml | 2 ++
> Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml | 1 +
> 3 files changed, 6 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
> index 627a5d6625ba..b2fbe886981b 100644
> --- a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
> +++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
> @@ -45,6 +45,9 @@ properties:
> the peripheral devices available on the PCIe bus.
> maxItems: 1
>
> + max-link-speed:
> + maximum: 5
Unless the default is less than the max, shouldn't the max here be 1
less than the h/w max?
> +
> num-lanes:
> description:
> Number of PCIe link lanes to use. Can be omitted should the already
> diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml
> index dcd521aed213..fc3b5d4ac245 100644
> --- a/Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml
> +++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml
> @@ -55,4 +55,6 @@ examples:
>
> phys = <&pcie_phy0>, <&pcie_phy1>, <&pcie_phy2>, <&pcie_phy3>;
> phy-names = "pcie0", "pcie1", "pcie2", "pcie3";
> +
> + max-link-speed = <3>;
> };
> diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
> index 4a5c8b933b52..01cedf51e0f8 100644
> --- a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
> @@ -74,4 +74,5 @@ examples:
> phy-names = "pcie";
>
> num-lanes = <1>;
> + max-link-speed = <3>;
This should give you an error because pci-bus.yaml only goes up to 4.
I'm not really sure that limiting it in the common schema is too useful.
We're going to be updating it one step at a time. Limiting it is really
only helpful for specific implementations.
Patch 1 didn't apply for me, so none of the checks ran.
Rob
next prev parent reply other threads:[~2022-06-15 14:55 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-10 8:56 [PATCH v3 00/17] PCI: dwc: Add generic resources and Baikal-T1 support Serge Semin
2022-06-10 8:56 ` [PATCH v3 01/17] dt-bindings: PCI: dwc: Detach common RP/EP DT bindings Serge Semin
2022-06-10 8:56 ` [PATCH v3 02/17] dt-bindings: PCI: dwc: Remove bus node from the examples Serge Semin
2022-06-15 16:30 ` Rob Herring
2022-06-10 8:56 ` [PATCH v3 03/17] dt-bindings: PCI: dwc: Add phys/phy-names common properties Serge Semin
2022-06-10 8:56 ` [PATCH v3 04/17] dt-bindings: PCI: dwc: Add max-link-speed common property Serge Semin
2022-06-15 14:55 ` Rob Herring [this message]
2022-06-19 14:27 ` Serge Semin
2022-06-28 12:15 ` Serge Semin
2022-06-28 14:56 ` Rob Herring
2022-06-29 1:50 ` Serge Semin
2022-07-01 14:44 ` Rob Herring
2022-07-07 19:02 ` Serge Semin
2022-06-10 8:56 ` [PATCH v3 05/17] dt-bindings: PCI: dwc: Stop selecting generic bindings by default Serge Semin
2022-06-10 8:56 ` [PATCH v3 06/17] dt-bindings: PCI: dwc: Add max-functions EP property Serge Semin
2022-06-15 16:31 ` Rob Herring
2022-06-10 8:56 ` [PATCH v3 07/17] dt-bindings: PCI: dwc: Add interrupts/interrupt-names common properties Serge Semin
2022-06-15 15:32 ` Rob Herring
2022-06-19 16:37 ` Serge Semin
2022-06-28 12:18 ` Serge Semin
2022-07-07 19:25 ` Serge Semin
2022-06-10 8:56 ` [PATCH v3 08/17] dt-bindings: PCI: dwc: Add reg/reg-names " Serge Semin
2022-06-10 8:56 ` [PATCH v3 09/17] dt-bindings: PCI: dwc: Add clocks/resets " Serge Semin
2022-06-10 8:56 ` [PATCH v3 10/17] dt-bindings: PCI: dwc: Add dma-coherent property Serge Semin
2022-06-10 8:56 ` [PATCH v3 11/17] dt-bindings: PCI: dwc: Apply common schema to Rockchip DW PCIe nodes Serge Semin
2022-06-10 13:12 ` Rob Herring
2022-06-10 21:13 ` Serge Semin
2022-06-10 8:57 ` [PATCH v3 12/17] dt-bindings: PCI: dwc: Add Baikal-T1 PCIe Root Port bindings Serge Semin
2022-06-15 16:37 ` Rob Herring
2022-06-19 20:03 ` Serge Semin
2022-06-28 12:19 ` Serge Semin
2022-07-01 14:59 ` Rob Herring
2022-07-07 19:19 ` Serge Semin
2022-06-10 8:57 ` [PATCH v3 13/17] PCI: dwc: Introduce generic controller capabilities interface Serge Semin
2022-06-15 16:42 ` Rob Herring
2022-06-10 8:57 ` [PATCH v3 14/17] PCI: dwc: Introduce generic resources getter Serge Semin
2022-06-15 16:46 ` Rob Herring
2022-06-10 8:57 ` [PATCH v3 15/17] PCI: dwc: Combine iATU detection procedures Serge Semin
2022-06-15 16:47 ` Rob Herring
2022-06-10 8:57 ` [PATCH v3 16/17] PCI: dwc: Introduce generic platform clocks and resets Serge Semin
2022-06-10 8:57 ` [PATCH v3 17/17] PCI: dwc: Add Baikal-T1 PCIe controller support Serge Semin
2022-06-15 16:48 ` Bjorn Helgaas
2022-06-20 17:13 ` Serge Semin
2022-06-21 18:29 ` Bjorn Helgaas
2022-06-22 17:04 ` Serge Semin
2022-06-28 12:23 ` Serge Semin
2022-06-28 15:17 ` Bjorn Helgaas
2022-06-15 17:10 ` Rob Herring
2022-06-19 20:39 ` Serge Semin
2022-07-12 20:29 ` Rob Herring
2022-07-12 20:58 ` Serge Semin
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