linux-kernel - Re: [PATCH v5 1/6] dt-bindings: PCI: Add bindings for Brcmstb EP voltage regulators

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Date:   Mon, 25 Oct 2021 17:24:39 -0500
From:   Rob Herring <robh@...nel.org>
To:     Jim Quinlan <jim2101024@...il.com>
Cc:     linux-pci@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com, james.quinlan@...adcom.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Saenz Julienne <nsaenzjulienne@...e.de>,
        "moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/6] dt-bindings: PCI: Add bindings for Brcmstb EP
 voltage regulators

On Fri, Oct 22, 2021 at 10:06:54AM -0400, Jim Quinlan wrote:
> Similar to the regulator bindings found in "rockchip-pcie-host.txt", this
> allows optional regulators to be attached and controlled by the PCIe RC
> driver.  That being said, this driver searches in the DT subnode (the EP
> node, eg pci@0,0) for the regulator property.
> 
> The use of a regulator property in the pcie EP subnode such as
> "vpcie12v-supply" depends on a pending pullreq to the pci-bus.yaml
> file at
> 
> https://github.com/devicetree-org/dt-schema/pull/54
> 
> Signed-off-by: Jim Quinlan <jim2101024@...il.com>
> ---
>  .../bindings/pci/brcm,stb-pcie.yaml           | 23 +++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> index b9589a0daa5c..fec13e4f6eda 100644
> --- a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> @@ -154,5 +154,28 @@ examples:
>                                   <0x42000000 0x1 0x80000000 0x3 0x00000000 0x0 0x80000000>;
>                      brcm,enable-ssc;
>                      brcm,scb-sizes =  <0x0000000080000000 0x0000000080000000>;
> +
> +                    /* PCIe bridge */

More specifically, the root port.

> +                    pci@0,0 {
> +                            #address-cells = <3>;
> +                            #size-cells = <2>;
> +                            reg = <0x0 0x0 0x0 0x0 0x0>;
> +                            device_type = "pci";
> +                            ranges;
> +
> +                            /* PCIe endpoint */
> +                            pci@0,0 {
> +                                    device_type = "pci";

This means this device is a PCI bridge which wouldn't typically be the 
endpoint. Is that intended? 

> +                                    assigned-addresses = <0x82010000 0x0 0xf8000000 0x6 0x00000000 0x0 0x2000>;
> +                                    reg = <0x0 0x0 0x0 0x0 0x0>;
> +                                    compatible = "pci14e4,1688";
> +                                    vpcie3v3-supply = <&vreg7>;
> +
> +                                    #address-cells = <3>;
> +                                    #size-cells = <2>;
> +
> +                                    ranges;
> +                            };
> +                    };
>              };
>      };
> -- 
> 2.17.1
> 
>