linux-kernel - Re: [PATCH] ARM: dts: imx: Add dummy PHYs for HSIC-only USB controllers

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Message-ID: <f29e4392-f466-df5f-83f6-52e04f27204c@kontron.de>
Date:   Thu, 22 Nov 2018 07:41:27 +0000
From:   Schrempf Frieder <frieder.schrempf@...tron.de>
To:     PETER CHEN <peter.chen@....com>, Shawn Guo <shawnguo@...nel.org>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        dl-linux-imx <linux-imx@....com>,
        "Pengutronix Kernel Team" <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: dts: imx: Add dummy PHYs for HSIC-only USB
 controllers

On 22.11.18 07:48, PETER CHEN wrote:
>   
>>
>> On Thu, Oct 18, 2018 at 09:45:04AM +0200, Frieder Schrempf wrote:
>>> Some SOCs in the i.MX6 family have a USB host controller that is only
>>> capable of the HSIC interface and has no on-board PHY.
>>>
>>> To be able to use these controllers, we need to add "usb-nop-xceiv"
>>> dummy PHYs.
>>>
>>> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
>>
>> @Peter, looks good to you?
>>
>> Shawn
>>
>>> ---
>>>   arch/arm/boot/dts/imx6qdl.dtsi | 14 ++++++++++++++
>>> arch/arm/boot/dts/imx6sl.dtsi  |  7 +++++++
>>> arch/arm/boot/dts/imx6sx.dtsi  |  6 ++++++
>>>   3 files changed, 27 insertions(+)
>>>
>>> diff --git a/arch/arm/boot/dts/imx6qdl.dtsi
>>> b/arch/arm/boot/dts/imx6qdl.dtsi index 61d2d26..d3404d1 100644
>>> --- a/arch/arm/boot/dts/imx6qdl.dtsi
>>> +++ b/arch/arm/boot/dts/imx6qdl.dtsi
>>> @@ -139,6 +139,16 @@
>>>   		interrupts = <0 94 IRQ_TYPE_LEVEL_HIGH>;
>>>   	};
>>>
>>> +	usbphynop1: usbphynop1 {
>>> +		compatible = "usb-nop-xceiv";
>>> +		#phy-cells = <0>;
>>> +	};
>>> +
> 
> Why #phy-cells property is needed? Others are ok for me.

 From Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt:

Required properties:
- compatible: should be usb-nop-xceiv
- #phy-cells: Must be 0

> 
> Peter
> 
>>> +	usbphynop2: usbphynop2 {
>>> +		compatible = "usb-nop-xceiv";
>>> +		#phy-cells = <0>;
>>> +	};
>>> +
>>>   	soc {
>>>   		#address-cells = <1>;
>>>   		#size-cells = <1>;
>>> @@ -981,6 +991,8 @@
>>>   				reg = <0x02184400 0x200>;
>>>   				interrupts = <0 41 IRQ_TYPE_LEVEL_HIGH>;
>>>   				clocks = <&clks IMX6QDL_CLK_USBOH3>;
>>> +				fsl,usbphy = <&usbphynop1>;
>>> +				phy_type = "hsic";
>>>   				fsl,usbmisc = <&usbmisc 2>;
>>>   				dr_mode = "host";
>>>   				ahb-burst-config = <0x0>;
>>> @@ -994,6 +1006,8 @@
>>>   				reg = <0x02184600 0x200>;
>>>   				interrupts = <0 42 IRQ_TYPE_LEVEL_HIGH>;
>>>   				clocks = <&clks IMX6QDL_CLK_USBOH3>;
>>> +				fsl,usbphy = <&usbphynop2>;
>>> +				phy_type = "hsic";
>>>   				fsl,usbmisc = <&usbmisc 3>;
>>>   				dr_mode = "host";
>>>   				ahb-burst-config = <0x0>;
>>> diff --git a/arch/arm/boot/dts/imx6sl.dtsi
>>> b/arch/arm/boot/dts/imx6sl.dtsi index 7a4f5da..81edcdc 100644
>>> --- a/arch/arm/boot/dts/imx6sl.dtsi
>>> +++ b/arch/arm/boot/dts/imx6sl.dtsi
>>> @@ -110,6 +110,11 @@
>>>   		interrupts = <0 94 IRQ_TYPE_LEVEL_HIGH>;
>>>   	};
>>>
>>> +	usbphynop1: usbphynop1 {
>>> +		compatible = "usb-nop-xceiv";
>>> +		#phy-cells = <0>;
>>> +	};
>>> +
>>>   	soc {
>>>   		#address-cells = <1>;
>>>   		#size-cells = <1>;
>>> @@ -815,6 +820,8 @@
>>>   				reg = <0x02184400 0x200>;
>>>   				interrupts = <0 40 IRQ_TYPE_LEVEL_HIGH>;
>>>   				clocks = <&clks IMX6SL_CLK_USBOH3>;
>>> +				fsl,usbphy = <&usbphynop1>;
>>> +				phy_type = "hsic";
>>>   				fsl,usbmisc = <&usbmisc 2>;
>>>   				dr_mode = "host";
>>>   				ahb-burst-config = <0x0>;
>>> diff --git a/arch/arm/boot/dts/imx6sx.dtsi
>>> b/arch/arm/boot/dts/imx6sx.dtsi index 844caa3..07ed417 100644
>>> --- a/arch/arm/boot/dts/imx6sx.dtsi
>>> +++ b/arch/arm/boot/dts/imx6sx.dtsi
>>> @@ -159,6 +159,11 @@
>>>   		interrupts = <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>;
>>>   	};
>>>
>>> +	usbphynop1: usbphynop1 {
>>> +		compatible = "usb-nop-xceiv";
>>> +		#phy-cells = <0>;
>>> +	};
>>> +
>>>   	soc {
>>>   		#address-cells = <1>;
>>>   		#size-cells = <1>;
>>> @@ -877,6 +882,7 @@
>>>   				reg = <0x02184400 0x200>;
>>>   				interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
>>>   				clocks = <&clks IMX6SX_CLK_USBOH3>;
>>> +				fsl,usbphy = <&usbphynop1>;
>>>   				fsl,usbmisc = <&usbmisc 2>;
>>>   				phy_type = "hsic";
>>>   				fsl,anatop = <&anatop>;
>>> --
>>> 2.7.4
>>>