linux-kernel - Re: [RESEND PATCH 1/2] Documentation: bindings: add DT documentation for u2phy and u2phy grf

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Date:   Wed, 01 Mar 2017 18:47:33 +0100
From:   Heiko Stuebner <heiko@...ech.de>
To:     Meng Dongyang <daniel.meng@...k-chips.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, geert+renesas@...der.be,
        yoshihiro.shimoda.uh@...esas.com,
        martin.blumenstingl@...glemail.com, devicetree@...r.kernel.org,
        kishon@...com, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        huangtao@...k-chips.com, kever.yang@...k-chips.com,
        william.wu@...k-chips.com, frank.wang@...k-chips.com
Subject: Re: [RESEND PATCH 1/2] Documentation: bindings: add DT documentation for u2phy and u2phy grf

Hi Daniel,

Am Mittwoch, 1. März 2017, 18:34:22 CET schrieb Meng Dongyang:
> Due to the u2phy registers are separated from general grf, we need to
> add u2phy grf node and place u2phy node in it. And on some platform,
> the 480m clock may need to assign clock parent in dts in stead of
> clock driver. So this patch add u2phy grf node and property of
> assigned-clocks and assigned-clock-parents to assign parent for 480m
> clock.
> 
> Signed-off-by: Meng Dongyang <daniel.meng@...k-chips.com>
> ---
>  .../bindings/phy/phy-rockchip-inno-usb2.txt        | 47
> ++++++++++++++++++++++ 1 file changed, 47 insertions(+)
> 
> diff --git
> a/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
> b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt index
> 3c29c77..dda9f22 100644
> --- a/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
> +++ b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
> @@ -2,6 +2,7 @@ ROCKCHIP USB2.0 PHY WITH INNO IP BLOCK
> 
>  Required properties (phy (parent) node):
>   - compatible : should be one of the listed compatibles:
> +	* "rockchip,rk3328-usb2phy"
>  	* "rockchip,rk3366-usb2phy"
>  	* "rockchip,rk3399-usb2phy"
>   - reg : the address offset of grf for usb-phy configuration.
> @@ -11,6 +12,11 @@ Required properties (phy (parent) node):
>  Optional properties:
>   - clocks : phandle + phy specifier pair, for the input clock of phy.
>   - clock-names : input clock name of phy, must be "phyclk".
> + - assigned-clocks : phandle of usb 480m clock.
> + - assigned-clock-parents : parent of usb 480m clock, select between
> +		 usb-phy output 480m and xin24m.
> +		 Refer to clk/clock-bindings.txt for generic clock
> +		 consumer properties.
> 
>  Required nodes : a sub-node is required for each port the phy provides.
>  		 The sub-node name is used to identify host or otg port,

this block looks good


> @@ -62,3 +68,44 @@ grf: syscon@...70000 {
>  		};
>  	};
>  };


> +
> +Required properties (usb2phy grf node):
> + - compatible : should be one of the listed compatibles:
> +		"rockchip,rk3328-usb2phy-grf", "syscon", "simple-mfd";
> + - reg : the address offset of grf for usb-phy configuration.
> + - #address-cells : should be 1.
> + - #size-cells : should be 1.
> +
> +Required nodes : a sub-node is required for the phy provides.
> +		 The sub-node name is used to identify each phy,
> +		 and shall be the following entries:
> +
> +Example:
> +
> +usb2phy_grf: syscon@...50000 {
> +	compatible = "rockchip,rk3328-usb2phy-grf", "syscon",
> +		     "simple-mfd";
> +	reg = <0x0 0xff450000 0x0 0x10000>;
> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +
> +	u2phy: usb2-phy@100 {
> +		compatible = "rockchip,rk3328-usb2phy";
> +		reg = <0x100 0x10>;
> +		clocks = <&xin24m>;
> +		clock-names = "phyclk";
> +		#clock-cells = <0>;
> +		assigned-clocks = <&cru USB480M>;
> +		assigned-clock-parents = <&u2phy>;
> +		clock-output-names = "usb480m_phy";
> +		status = "disabled";
> +
> +		u2phy_host: host-port {
> +			#phy-cells = <0>;
> +			interrupts = <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-names = "linestate";
> +			status = "disabled";
> +		};
> +	};
> +};
> +

please don't add this here.

I've looked it up in the TRM and usb2phy-grf are still just "General Register 
Files", which also include some other registers besides this phy - so 
structure-wise this is good.
But please document the new grf-compatible in the regular
Documentation/devicetree/bindings/soc/rockchip/grf.txt .

And there is no need for a duplicate example, as it is the same structure as 
before, so maybe just add the assigned-clocks parts to the existing example.


Thanks
Heiko