linux-kernel - Re: [PATCH 2/5] ARM: dts: AM4372: Add USB nodes

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Date:	Thu, 6 Mar 2014 17:57:46 +0530
From:	George Cherian <george.cherian@...com>
To:	Roger Quadros <rogerq@...com>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<devicetree@...r.kernel.org>
CC:	<anatol.pomozov@...il.com>, <gregkh@...uxfoundation.org>,
	<balbi@...com>, <kishon@...com>, <rob@...dley.net>,
	<galak@...eaurora.org>, <ijc+devicetree@...lion.org.uk>,
	<mark.rutland@....com>, <pawel.moll@....com>, <robh+dt@...nel.org>,
	<bcousson@...libre.com>, <tony@...mide.com>
Subject: Re: [PATCH 2/5] ARM: dts: AM4372: Add USB nodes

Hi Roger,

On 3/6/2014 2:19 PM, Roger Quadros wrote:
> Hi George,
>
> On 03/03/2014 03:53 PM, George Cherian wrote:
>> Add nodes for 2 instances each of
>> 	- ocp2scp
>> 	- USB PHY control module
>> 	- USB PHY
>> 	- dwc3_omap
>> 	- USB
>>
>> for AM43xx.
>>
>> Signed-off-by: George Cherian <george.cherian@...com>
>> ---
>>   arch/arm/boot/dts/am4372.dtsi | 99 +++++++++++++++++++++++++++++++++++++++++++
>>   1 file changed, 99 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/am4372.dtsi b/arch/arm/boot/dts/am4372.dtsi
>> index 5a7cc38..90408b3 100644
>> --- a/arch/arm/boot/dts/am4372.dtsi
>> +++ b/arch/arm/boot/dts/am4372.dtsi
>> @@ -698,6 +698,105 @@
>>   			       <&edma 11>;
>>   			dma-names = "tx", "rx";
>>   		};
>> +
>> +		am43xx_control_usb2phy1: control-phy@...10620 {
>> +			compatible = "ti,control-phy-am437usb2";
> Since this is the first usage of this compatible ID, we still have room to
> change it to be better. Tony's suggestion was to use "ti,control-phy-am437-usb2"
>
> Please see
> http://article.gmane.org/gmane.linux.drivers.devicetree/64833

Okay.
>> +			reg = <0x44e10620 0x4>;
>> +			reg-names = "power";
>> +			status = "disabled";
> Why disable something that is within the SoC and does not affect board configurations?
>
> Question applies for all the nodes in this patch except the ones that come out on the
> SoC pins. e.g. PHY.
Okay
>> +		};
>> +
>> +		am43xx_control_usb2phy2: control-phy@...4e10628 {
>> +			compatible = "ti,control-phy-am437usb2";
>> +			reg = <0x44e10628 0x4>;
>> +			reg-names = "power";
>> +			status = "disabled";
>> +		};
>> +
>> +		ocp2scp0: ocp2scp@...a8000 {
>> +			compatible = "ti,omap-ocp2scp";
>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +			ranges;
>> +			ti,hwmods = "ocp2scp0";
>> +			status = "disabled";
>> +
>> +			usb2_phy1: usb2phy1@...a8000 {
> should be
okay
> 			usb2_phy1: phy@...a8000 {
>
>> +				compatible = "ti,am437x-usb2";
>> +				reg = <0x483a8000 0x8000>;
>> +				ctrl-module = <&am43xx_control_usb2phy1>;
>> +				clocks = <&clk_32768_ck>,
>> +					 <&usb_otg_ss0_refclk960m>;
>> +				clock-names = "usb_phy_cm_clk32k",
>> +					      "usb_otg_ss_refclk960m";
> clock-names should be platform independent. Better option would be to
> modify the usb2 driver to use names like "wkupclk" and "refclk"
The phy driver still does devm_get_clk using above clock names and not 
"wkupclk" and "refclk".

>> +				#phy-cells = <0>;
>> +				status = "disabled";
>> +			};
>> +		};
>> +
>> +		ocp2scp1: ocp2scp@...e8000 {
>> +			compatible = "ti,omap-ocp2scp";
>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +			ranges;
>> +			ti,hwmods = "ocp2scp1";
>> +			status = "disabled";
>> +
>> +			usb2_phy2: usb2phy2@...e8000 {
>> +				compatible = "ti,am437x-usb2";
>> +				reg = <0x483e8000 0x8000>;
>> +				ctrl-module = <&am43xx_control_usb2phy2>;
>> +				clocks = <&clk_32768_ck>,
>> +					 <&usb_otg_ss1_refclk960m>;
>> +				clock-names = "usb_phy_cm_clk32k",
>> +					      "usb_otg_ss_refclk960m";
>> +				#phy-cells = <0>;
>> +				status = "disabled";
>> +			};
>> +		};
>> +
>> +		dwc3_1: omap_dwc3_1@...80000 {
>> +			compatible = "ti,am437x-dwc3";
>> +			ti,hwmods = "usb_otg_ss0";
>> +			reg = <0x48380000 0x10000>;
>> +			interrupts = <GIC_SPI 172 IRQ_TYPE_LEVEL_HIGH>;
>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +			utmi-mode = <1>;
>> +			ranges;
>> +			status = "disabled";
>> +
>> +			usb1: usb@...90000 {
>> +				compatible = "synopsys,dwc3";
>> +				reg = <0x48390000 0x17000>;
>> +				interrupts = <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>;
>> +				usb-phy = <&usb2_phy1>;
> shouldn't this be		phys = <&usb2_phy1>;	?

At the time of writing this patch phys property is still not in.
Also generic-phy conversion for dwc3 was recently posted by kishon.
>> +				phy-names = "usb2-phy";
> what about
> 	maximum-speed = "high-speed";
> and
> 	dr_mode = "otg"; ?

Done from board file. Actually maximum-speed I can set here.
dr_mode is a board property.
>> +				status = "disabled";
>> +			};
>> +		};
>> +
>> +		dwc3_2: omap_dwc3_2@...c0000 {
>> +			compatible = "ti,am437x-dwc3";
>> +			ti,hwmods = "usb_otg_ss1";
>> +			reg = <0x483c0000 0x10000>;
>> +			interrupts = <GIC_SPI 178 IRQ_TYPE_LEVEL_HIGH>;
>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +			utmi-mode = <1>;
>> +			ranges;
>> +			status = "disabled";
>> +
>> +			usb2: usb@...d0000 {
>> +				compatible = "synopsys,dwc3";
>> +				reg = <0x483d0000 0x17000>;
>> +				interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
>> +				usb-phy = <&usb2_phy2>;
>> +				phy-names = "usb2-phy";
>> +				status = "disabled";
>> +			};
>> +		};
>> +
>>   	};
>>   };
>>   
>>
> cheers,
> -roger


-- 
-George

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