linux-kernel - Re: [v3, PATCH 2/2] dt-binding: mediatek-dwmac: add binding document for MediaTek MT2712 DWMAC

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Message-ID: <20181117145611.GA26013@bogus>
Date:   Sat, 17 Nov 2018 08:56:11 -0600
From:   Rob Herring <robh@...nel.org>
To:     Biao Huang <biao.huang@...iatek.com>
Cc:     davem@...emloft.net, honghui.zhang@...iatek.com,
        yt.shen@...iatek.com, liguo.zhang@...iatek.com,
        mark.rutland@....com, nelson.chang@...iatek.com,
        matthias.bgg@...il.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, joabreu@...opsys.com,
        andrew@...n.ch
Subject: Re: [v3, PATCH 2/2] dt-binding: mediatek-dwmac: add binding document
 for MediaTek MT2712 DWMAC

On Fri, Nov 16, 2018 at 05:18:46PM +0800, Biao Huang wrote:
> The commit adds the device tree binding documentation for the MediaTek DWMAC
> found on MediaTek MT2712.
> 
> Change-Id: I3728666bf65927164bd82fa8dddb90df8270bd44
> Signed-off-by: Biao Huang <biao.huang@...iatek.com>
> ---
>  .../devicetree/bindings/net/mediatek-dwmac.txt     |   77 ++++++++++++++++++++
>  1 file changed, 77 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/mediatek-dwmac.txt
> 
> diff --git a/Documentation/devicetree/bindings/net/mediatek-dwmac.txt b/Documentation/devicetree/bindings/net/mediatek-dwmac.txt
> new file mode 100644
> index 0000000..7fd56e0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/mediatek-dwmac.txt
> @@ -0,0 +1,77 @@
> +MediaTek DWMAC glue layer controller
> +
> +This file documents platform glue layer for stmmac.
> +Please see stmmac.txt for the other unchanged properties.
> +
> +The device node has following properties.
> +
> +Required properties:
> +- compatible:  Should be "mediatek,mt2712-gmac" for MT2712 SoC
> +- reg:  Address and length of the register set for the device
> +- interrupts:  Should contain the MAC interrupts

How many?

> +- interrupt-names: Should contain a list of interrupt names corresponding to
> +	the interrupts in the interrupts property, if available.
> +	Should be "macirq" for the main MAC IRQ
> +- clocks: Must contain a phandle for each entry in clock-names.
> +- clock-names: The name of the clock listed in the clocks property. These are
> +	"axi", "apb", "mac_ext", "mac_parent", "ptp_ref", "ptp_parent", "ptp_top"
> +	for MT2712 SoC

Clocks should represent the physical clocks connected to a block. Parent 
clocks are not in that category.

> +- mac-address: See ethernet.txt in the same directory
> +- phy-mode: See ethernet.txt in the same directory
> +
> +Optional properties:
> +- tx-delay: TX clock delay macro value. Range is 0~31. Default is 0.
> +	It should be defined for rgmii/rgmii-rxid/mii interface.
> +- rx-delay: RX clock delay macro value. Range is 0~31. Default is 0.
> +	It should be defined for rgmii/rgmii-txid/mii/rmii interface.
> +- fine-tune: This property will select coarse-tune delay or fine delay
> +	for rgmii interface.
> +	If fine-tune delay is enabled, tx-delay/rx-delay is 170+/-50ps
> +	per stage.
> +	Else coarse-tune delay is enabled, tx-delay/rx-delay is 0.55+/-0.2ns
> +	per stage.
> +	This property do not apply to non-rgmii PHYs.
> +	Only coarse-tune delay is supported for mii/rmii PHYs.

Perhaps the delays should be in ps and the driver can figure out 
fine-tune or not based on the value.

> +- rmii-rxc: Reference clock of rmii is from external PHYs,
> +	and it can be connected to TXC or RXC pin on MT2712 SoC.
> +	If ref_clk <--> TXC, disable it.
> +	Else ref_clk <--> RXC, enable it.
> +- txc-inverse: Inverse tx clock for mii/rgmii.
> +	Inverse tx clock inside MAC relative to reference clock for rmii,
> +	and it rarely happen.
> +- rxc-inverse: Inverse rx clock for mii/rgmii interfaces.
> +	Inverse reference clock for rmii.

These should all have vendor prefixes. 'snps' if these are all standard 
GMAC controls or 'mediatek' if Mediatek specific.

> +
> +Example:
> +	eth: ethernet@...1c000 {
> +		compatible = "mediatek,mt2712-gmac";
> +		reg = <0 0x1101c000 0 0x1300>;
> +		interrupts = <GIC_SPI 237 IRQ_TYPE_LEVEL_LOW>;
> +		interrupt-names = "macirq";
> +		phy-mode ="rgmii-id";
> +		mac-address = [00 55 7b b5 7d f7];
> +		clock-names = "axi",
> +			      "apb",
> +			      "mac_ext",
> +			      "mac_parent",
> +			      "ptp_ref",
> +			      "ptp_parent",
> +			      "ptp_top";
> +		clocks = <&pericfg CLK_PERI_GMAC>,
> +			 <&pericfg CLK_PERI_GMAC_PCLK>,
> +			 <&topckgen CLK_TOP_ETHER_125M_SEL>,
> +			 <&topckgen CLK_TOP_ETHERPLL_125M>,
> +			 <&topckgen CLK_TOP_ETHER_50M_SEL>,
> +			 <&topckgen CLK_TOP_APLL1_D3>,
> +			 <&topckgen CLK_TOP_APLL1>;
> +		snps,txpbl = <32>;
> +		snps,rxpbl = <32>;
> +		snps,reset-gpio = <&pio 87 GPIO_ACTIVE_LOW>;
> +		snps,reset-active-low;
> +		tx-delay = <9>;
> +		rx-delay = <9>;
> +		fine-tune;
> +		rmii-rxc;
> +		txc-inverse;
> +		rxc-inverse;
> +	};
> -- 
> 1.7.9.5
>