linux-kernel - Re: [PATCH 2/2] dt-bindings: phy: Add binding for Mediatek MT7621 PCIe PHY

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Date:   Thu, 28 Mar 2019 10:42:38 -0500
From:   Rob Herring <robh@...nel.org>
To:     Sergio Paracuellos <sergio.paracuellos@...il.com>
Cc:     kishon@...com, linux-kernel@...r.kernel.org,
        driverdev-devel@...uxdriverproject.org, devicetree@...r.kernel.org,
        john@...ozen.org, linux-mips@...r.kernel.org, neil@...wn.name
Subject: Re: [PATCH 2/2] dt-bindings: phy: Add binding for Mediatek MT7621
 PCIe PHY

On Thu, Mar 14, 2019 at 02:22:10PM +0100, Sergio Paracuellos wrote:
> Add bindings to describe Mediatek MT7621 PCIe PHY.

Binding should come before the driver.

> 
> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
> ---
>  .../bindings/phy/mediatek,mt7621-pci-phy.txt  | 54 +++++++++++++++++++
>  1 file changed, 54 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/mediatek,mt7621-pci-phy.txt
> 
> diff --git a/Documentation/devicetree/bindings/phy/mediatek,mt7621-pci-phy.txt b/Documentation/devicetree/bindings/phy/mediatek,mt7621-pci-phy.txt
> new file mode 100644
> index 000000000000..8addedbe815e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/mediatek,mt7621-pci-phy.txt
> @@ -0,0 +1,54 @@
> +Mediatek Mt7621 PCIe PHY
> +
> +Required properties:
> +- compatible: must be "mediatek,mt7621-pci-phy"
> +- reg: base address and length of the PCIe PHY block
> +- #address-cells: must be 1
> +- #size-cells: must be 0
> +
> +Each PCIe PHY should be represented by a child node
> +
> +Required properties For the child node:
> +- reg: the PHY ID
> +0 - PCIe RC 0
> +1 - PCIe RC 1
> +- #phy-cells: must be 0
> +
> +Example:
> +	pcie0_phy: pcie-phy@...49000 {
> +		compatible = "mediatek,mt7621-pci-phy";
> +		reg = <0x1e149000 0x0700>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		pcie0_port: pcie-phy@0 {
> +			reg = <0>;
> +			#phy-cells = <0>;
> +		};
> +
> +		pcie1_port: pcie-phy@1 {
> +			reg = <1>;
> +			#phy-cells = <0>;
> +		};

If each phy port doesn't have its own resources, then you don't need 
child nodes. Just set #phy-cells to 1.

> +	};
> +
> +	pcie1_phy: pcie-phy@...4a000 {
> +		compatible = "mediatek,mt7621-pci-phy";
> +		reg = <0x1e14a000 0x0700>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		pcie2_port: pcie-phy@0 {
> +			reg = <0>;
> +			#phy-cells = <0>;
> +		};
> +	};
> +
> +	/* users of the PCIe phy */
> +
> +	pcie: pcie@...40000 {
> +		...
> +		...
> +		phys = <&pcie0_port>, <&pcie1_port>, <&pcie2_port>;
> +		phy-names = "pcie-phy0", "pcie-phy1", "pcie-phy2";
> +	};
> -- 
> 2.19.1
>