linux-kernel - Re: [PATCH] ARM: BCM5301X: Specify PHY of USB 2.0 in DT

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Date:	Wed, 1 Jun 2016 12:21:39 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Rafał Miłecki <zajec5@...il.com>
Cc:	Hauke Mehrtens <hauke@...ke-m.de>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@...linux.org.uk>,
	"open list:BROADCOM BCM5301X ARM ARCHITECTURE" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	Jon Mason <jon.mason@...adcom.com>
Subject: Re: [PATCH] ARM: BCM5301X: Specify PHY of USB 2.0 in DT

On 06/01/2016 12:16 PM, Rafał Miłecki wrote:
> Driver for Northstar USB 2.0 PHY was added in 4.7-rc1 by:
> commit d3feb4067335 ("phy: bcm-ns-usb2: new driver for USB 2.0 PHY on
> Northstar").
> It should be used to let EHCI platform driver init PHY.
> 
> Signed-off-by: Rafał Miłecki <zajec5@...il.com>
> ---
>  arch/arm/boot/dts/bcm5301x.dtsi | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/bcm5301x.dtsi b/arch/arm/boot/dts/bcm5301x.dtsi
> index 7d4d29b..9300e19 100644
> --- a/arch/arm/boot/dts/bcm5301x.dtsi
> +++ b/arch/arm/boot/dts/bcm5301x.dtsi
> @@ -140,6 +140,22 @@
>  		};
>  	};
>  
> +	phys {
> +		compatible = "simple-bus";
> +		ranges = <0x00000000 0x18000000 0x00100000>;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +
> +		usb2_phy2: usb2-phy {
> +			compatible = "brcm,ns-usb2-phy";
> +			reg = <0x0000c000 0x1000>;
> +			reg-names = "dmu";
> +			#phy-cells = <0>;
> +			clocks = <&genpll BCM_NSP_GENPLL_USB_PHY_REF_CLK>;
> +			clock-names = "phy-ref-clk";
> +		};

You guys need to get everything straigthen up when it comes to busing
and child nodes for bcm53101x.dtsi, why do we need a "simple-bus" node
here which overlaps in part with the brcm-bus-axi node's range?

The more I look at BCMA and how it gets used for a non-external WLAN
card, and the less I am convinced it brings anything useful to the game,
quite the contrary...

> +	};
> +
>  	axi@...00000 {
>  		compatible = "brcm,bus-axi";
>  		reg = <0x18000000 0x1000>;
> @@ -217,6 +233,8 @@
>  
>  			#address-cells = <1>;
>  			#size-cells = <1>;
> +
> +			phys = <&usb2_phy2>;
>  		};
>  
>  		usb3: usb3@...00 {
> 


-- 
Florian