Message-ID: <20160302184637.GA4042@rob-hp-laptop>
Date:	Wed, 2 Mar 2016 12:46:37 -0600
From:	Rob Herring <robh@...nel.org>
To:	John Crispin <blogic@...nwrt.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Fred Chang (張嘉宏) 
	<Fred.Chang@...iatek.com>, devicetree@...r.kernel.org,
	Felix Fietkau <nbd@...nwrt.org>,
	Steven Liu (劉人豪) 
	<steven.liu@...iatek.com>, netdev@...r.kernel.org,
	Carlos Huang (黃士彰) 
	<Carlos.Huang@...iatek.com>, linux-kernel@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	Matthias Brugger <matthias.bgg@...il.com>,
	Michael Lee <igvtee@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V2 01/12] net-next: mediatek: Document ralink/mediatek
 SoC ethernet binding

On Fri, Feb 26, 2016 at 03:21:33PM +0100, John Crispin wrote:
> Add three files. One describes the actual frame engine, the other two
> describe fast ethernet and gigabit switches bindings.
> 
> Signed-off-by: John Crispin <blogic@...nwrt.org>
> Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
> Signed-off-by: Michael Lee <igvtee@...il.com>

Does this reflect the order people worked on this? Your SoB typically 
would be last.

> Cc: devicetree@...r.kernel.org
> ---
>  .../devicetree/bindings/net/mediatek-net-esw.txt   |   25 +++++
>  .../devicetree/bindings/net/mediatek-net-gsw.txt   |   48 +++++++++
>  .../devicetree/bindings/net/mediatek-net.txt       |  113 ++++++++++++++++++++
>  3 files changed, 186 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/mediatek-net-esw.txt
>  create mode 100644 Documentation/devicetree/bindings/net/mediatek-net-gsw.txt
>  create mode 100644 Documentation/devicetree/bindings/net/mediatek-net.txt
> 
> diff --git a/Documentation/devicetree/bindings/net/mediatek-net-esw.txt b/Documentation/devicetree/bindings/net/mediatek-net-esw.txt
> new file mode 100644
> index 0000000..84c51a0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/mediatek-net-esw.txt
> @@ -0,0 +1,25 @@
> +Ralink Fast Ethernet Embedded Switch
> +====================================
> +
> +The ralink fast ethernet embedded switch can be found on Ralink and Mediatek
> +SoCs (RT3x5x, RT5350, MT76x8).
> +
> +Required properties:
> +- compatible: Should be "ralink,rt3050-esw"
> +- reg: Address and length of the register set for the device
> +- interrupts: Should contain the embedded switches interrupt
> +
> +Optional properties:
> +- mediatek,led_polarity: override the active high/low settings of the leds

Don't use '_'.

This doesn't tell me what the polaritiy actually is.

> +- interrupt-parent: Should be the phandle for the interrupt controller
> +  that services interrupts for this device
> +
> +Example:
> +
> +esw@...10000 {
> +	compatible = "ralink,rt3050-esw";
> +	reg = <0x10110000 8000>;
> +
> +	interrupt-parent = <&intc>;
> +	interrupts = <17>;
> +};
> diff --git a/Documentation/devicetree/bindings/net/mediatek-net-gsw.txt b/Documentation/devicetree/bindings/net/mediatek-net-gsw.txt
> new file mode 100644
> index 0000000..596b385
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/mediatek-net-gsw.txt
> @@ -0,0 +1,48 @@
> +Mediatek Gigabit Switch
> +=======================
> +
> +The mediatek gigabit switch can be found on Mediatek SoCs.
> +
> +Required properties:
> +- compatible: Should be "mediatek,mt7620-gsw", "mediatek,mt7621-gsw",
> +  "mediatek,mt7623-gsw"

This is an OR condition? Formatting like this would be better:

Should be one of:
	"mediatek,mt7620-gsw"
	"mediatek,mt7621-gsw"
	"mediatek,mt7623-gsw"

> +- reg: Address and length of the register set for the device
> +- interrupts: Should contain the gigabit switches interrupt

s/switches/switch's/

> +
> +
> +Additional required properties for ARM based SoCs:

Which ones are those? Describe in terms of compatible properties.

> +- mediatek,reset-pin: phandle describing the reset GPIO
> +- clocks: the clocks used by the switch
> +- clock-names: the names of the clocks listed in the clocks property
> +  these should be "trgpll", "esw", "gp2", "gp1"
> +- mt7530-supply: the phandle of the regulator used to power the switch
> +- mediatek,pctl-regmap: phandle to the port control regmap. this is used to
> +  setup the drive current
> +
> +
> +Optional properties:
> +- interrupt-parent: Should be the phandle for the interrupt controller
> +  that services interrupts for this device
> +
> +Example:
> +
> +gsw: switch@...00000 {
> +	compatible = "mediatek,mt7623-gsw";
> +	reg = <0 0x1b110000 0 0x300000>;
> +
> +	interrupt-parent = <&pio>;
> +	interrupts = <168 IRQ_TYPE_EDGE_RISING>;
> +
> +	clocks = <&apmixedsys CLK_APMIXED_TRGPLL>,
> +		 <&ethsys CLK_ETHSYS_ESW>,
> +		 <&ethsys CLK_ETHSYS_GP2>,
> +		 <&ethsys CLK_ETHSYS_GP1>;
> +	clock-names = "trgpll", "esw", "gp2", "gp1";
> +
> +	mt7530-supply = <&mt6323_vpa_reg>;
> +
> +	mediatek,pctl-regmap = <&syscfg_pctl_a>;
> +	mediatek,reset-pin = <&pio 15 0>;
> +
> +	status = "okay";
> +};
> diff --git a/Documentation/devicetree/bindings/net/mediatek-net.txt b/Documentation/devicetree/bindings/net/mediatek-net.txt
> new file mode 100644
> index 0000000..f8c5747
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/mediatek-net.txt
> @@ -0,0 +1,113 @@
> +iMEdiatek Frame Engine Ethernet controller

typo?

> +=======================================
> +
> +The frame engine ethernet controller can be found on Ralink and Mediatek SoCs
> +(RT288x, RT3x5x, RT366x, RT388x, rt5350, mt7620, mt7621, mt76x8).
> +
> +Depending on the SoC, there is a number of ports connected to the CPU port
> +directly and/or via a (gigabit-)switch. Newer gigabit SoCs can support
> +a dual MAC setup.
> +
> +* Ethernet controller node
> +
> +Required properties:
> +- compatible: Should be one of "ralink,rt2880-eth", "ralink,rt3050-eth",
> +  "ralink,rt3050-eth", "ralink,rt3883-eth", "ralink,rt5350-eth",
> +  "mediatek,mt7620-eth", "mediatek,mt7621-eth", "mediatek,mt7623-eth"

Do one per line.

> +- reg: Address and length of the register set for the device
> +- interrupts: Should contain the frame engines interrupt
> +- mediatek,ethsys: phandle to the syscon node that handles the port setup
> +
> +Required properties for ARM based SoCs:

Which ones?

> +- clocks: the clock used by the core
> +- clock-names: the names of the clock listed in the clocks property
> +- power-domains: phandle the to power domain that the ethernet is part of
> +
> +Optional properties:
> +- interrupt-parent: Should be the phandle for the interrupt controller
> +  that services interrupts for this device
> +- mediatek,switch : phandle pointing at the device node of the switch device
> +
> +
> +* Ethernet port node for MT7620
> +
> +We need to define which physical port is wired and how it should be setup.
> +
> +Required properties:
> +- compatible: Should be "mediatek,eth-port"
> +- reg: The number of the physical port
> +- phy-handle: reference to the node describing the phy
> +
> +
> +* Ethernet MAC node - dual MAC SoCs only
> +
> +Required properties:
> +- compatible: Should be "mediatek,eth-mac"
> +- reg: The number of the MAC
> +
> +
> +Example for singel MAC SoC:

s/singel/single/

> +
> +mdio-bus {
> +	status = "okay";
> +
> +	phy4: ethernet-phy@4 {
> +		reg = <4>;
> +		phy-mode = "rgmii";
> +	};
> +};
> +
> +eth: ethernet@...00000 {
> +	compatible = "mediatek,mt7620-eth";
> +	reg = <0x10100000 10000>;
> +
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	interrupt-parent = <&cpuintc>;
> +	interrupts = <5>;
> +
> +	mediatek,switch = <&gsw>;
> +
> +	port@4 {
> +		status = "okay";
> +		phy-mode = "rgmii";
> +		phy-handle = <&phy4>;
> +	};
> +};
> +
> +
> +Example for dual MAC SoC:
> +
> +eth: ethernet@...00000 {
> +	compatible = "mediatek,mt7623-eth";
> +	reg = <0 0x1b100000 0 0x10000>;
> +
> +	clocks = <&topckgen CLK_TOP_ETHIF_SEL>;
> +	clock-names = "ethif";
> +
> +	interrupts = <GIC_SPI 200 IRQ_TYPE_LEVEL_LOW>;
> +	power-domains = <&scpsys MT2701_POWER_DOMAIN_ETH>;
> +
> +	mediatek,ethsys = <&ethsys>;
> +	mediatek,switch = <&gsw>;
> +
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	status = "disabled";
> +
> +	gmac1: mac@0 {
> +		compatible = "mediatek,eth-mac";
> +		reg = <0>;
> +
> +		status = "okay";

The parent disabled and this enabled doesn't make sense. I'd just drop 
status from examples.

> +	};
> +
> +	gmac2: mac@1 {
> +		compatible = "mediatek,eth-mac";
> +		reg = <1>;
> +
> +		status = "okay";
> +	};
> +};
> -- 
> 1.7.10.4
> 
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