Subject: [PATCH v3 4/7] ARM: dts: omap3-overo: Add HSUSB PHY

From: [email-masked] (Florian Vaussard)
Date: Fri, 07 Mar 2014 16:31:18 +0100

On 03/05/2014 09:01 AM, Florian Vaussard wrote:
> 
> On 03/03/2014 02:07 PM, Roger Quadros wrote:
>>
>> On 03/03/2014 02:48 PM, Florian Vaussard wrote:
>>> Hi Roger,
>>>
>>> On 03/03/2014 12:03 PM, Roger Quadros wrote:
>>>> Hi Florian,
>>>>
>>>>
>>>> On 03/03/2014 11:34 AM, Florian Vaussard wrote:
>>>>> Add the High-Speed USB PHY.
>>>>>
>>>>> Signed-off-by: Florian Vaussard <[email-masked]>
>>>>> ---
>>>>>  arch/arm/boot/dts/omap3-overo-storm-tobi.dts | 16 ++++++++++
>>>>>  arch/arm/boot/dts/omap3-overo-tobi.dts       | 16 ++++++++++
>>>>>  arch/arm/boot/dts/omap3-overo.dtsi           | 44 ++++++++++++++++++++++++++++
>>>>>  3 files changed, 76 insertions(+)
>>>>>
>>>>> diff --git a/arch/arm/boot/dts/omap3-overo-storm-tobi.dts b/arch/arm/boot/dts/omap3-overo-storm-tobi.dts
>>>>> index 2033b52..eb93e3a 100644
>>>>> --- a/arch/arm/boot/dts/omap3-overo-storm-tobi.dts
>>>>> +++ b/arch/arm/boot/dts/omap3-overo-storm-tobi.dts
>>>>> @@ -21,6 +21,22 @@
>>>>>  };
>>>>>  
>>>>>  &omap3_pmx_core2 {
>>>>> +	pinctrl-names = "default";
>>>>> +	pinctrl-0 = <
>>>>> +			&hsusb2_2_pins
>>>>> +	>;
>>>>> +
>>>>> +	hsusb2_2_pins: pinmux_hsusb2_2_pins {
>>>>> +		pinctrl-single,pins = <
>>>>> +			OMAP3630_CORE2_IOPAD(0x25f0, PIN_OUTPUT | MUX_MODE3)		/* etk_d10.hsusb2_clk */
>>>>> +			OMAP3630_CORE2_IOPAD(0x25f2, PIN_OUTPUT | MUX_MODE3)		/* etk_d11.hsusb2_stp */
>>>>> +			OMAP3630_CORE2_IOPAD(0x25f4, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* etk_d12.hsusb2_dir */
>>>>> +			OMAP3630_CORE2_IOPAD(0x25f6, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* etk_d13.hsusb2_nxt */
>>>>> +			OMAP3630_CORE2_IOPAD(0x25f8, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* etk_d14.hsusb2_data0 */
>>>>> +			OMAP3630_CORE2_IOPAD(0x25fa, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* etk_d15.hsusb2_data1 */
>>>>> +		>;
>>>>> +	};
>>>>> +
>>>>>  	w3cbw003c_2_pins: pinmux_w3cbw003c_2_pins {
>>>>>  		pinctrl-single,pins = <
>>>>>  			OMAP3630_CORE2_IOPAD(0x25e0, PIN_OUTPUT | MUX_MODE4)		/* etk_d2.gpio_16 */
>>>>> diff --git a/arch/arm/boot/dts/omap3-overo-tobi.dts b/arch/arm/boot/dts/omap3-overo-tobi.dts
>>>>> index 21de31d..e77be26 100644
>>>>> --- a/arch/arm/boot/dts/omap3-overo-tobi.dts
>>>>> +++ b/arch/arm/boot/dts/omap3-overo-tobi.dts
>>>>> @@ -21,6 +21,22 @@
>>>>>  };
>>>>>  
>>>>>  &omap3_pmx_core2 {
>>>>> +	pinctrl-names = "default";
>>>>> +	pinctrl-0 = <
>>>>> +			&hsusb2_2_pins
>>>>> +	>;
>>>>> +
>>>>> +	hsusb2_2_pins: pinmux_hsusb2_2_pins {
>>>>> +		pinctrl-single,pins = <
>>>>> +			OMAP3430_CORE2_IOPAD(0x25f0, PIN_OUTPUT | MUX_MODE3)		/* etk_d10.hsusb2_clk */
>>>>> +			OMAP3430_CORE2_IOPAD(0x25f2, PIN_OUTPUT | MUX_MODE3)		/* etk_d11.hsusb2_stp */
>>>>> +			OMAP3430_CORE2_IOPAD(0x25f4, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* etk_d12.hsusb2_dir */
>>>>> +			OMAP3430_CORE2_IOPAD(0x25f6, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* etk_d13.hsusb2_nxt */
>>>>> +			OMAP3430_CORE2_IOPAD(0x25f8, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* etk_d14.hsusb2_data0 */
>>>>> +			OMAP3430_CORE2_IOPAD(0x25fa, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* etk_d15.hsusb2_data1 */
>>>>> +		>;
>>>>> +	};
>>>>> +
>>>>>  	w3cbw003c_2_pins: pinmux_w3cbw003c_2_pins {
>>>>>  		pinctrl-single,pins = <
>>>>>  			OMAP3430_CORE2_IOPAD(0x25e0, PIN_OUTPUT | MUX_MODE4)		/* etk_d2.gpio_16 */
>>>>> diff --git a/arch/arm/boot/dts/omap3-overo.dtsi b/arch/arm/boot/dts/omap3-overo.dtsi
>>>>> index 07467cc..8f810db 100644
>>>>> --- a/arch/arm/boot/dts/omap3-overo.dtsi
>>>>> +++ b/arch/arm/boot/dts/omap3-overo.dtsi
>>>>> @@ -30,6 +30,24 @@
>>>>>  		ti,codec = <&twl_audio>;
>>>>>  	};
>>>>>  
>>>>> +	/* HS USB Port 2 Power */
>>>>> +	hsusb2_power: hsusb2_power_reg {
>>>>> +		compatible = "regulator-fixed";
>>>>> +		regulator-name = "hsusb2_vbus";
>>>>> +		regulator-min-microvolt = <5000000>;
>>>>> +		regulator-max-microvolt = <5000000>;
>>>>> +		gpio = <&gpio6 8 0>;				/* gpio_168: vbus enable */
>>>>> +		startup-delay-us = <70000>;
>>>>> +		enable-active-high;
>>>>> +	};
>>>>> +
>>>>> +	/* HS USB Host PHY on PORT 2 */
>>>>> +	hsusb2_phy: hsusb2_phy {
>>>>> +		compatible = "usb-nop-xceiv";
>>>>> +		reset-gpios = <&gpio6 23 GPIO_ACTIVE_LOW>;	/* gpio_183 */
>>>>> +		vcc-supply = <&hsusb2_power>;
>>>>> +	};
>>>>> +
>>>>>  	/* Regulator to trigger the nPoweron signal of the Wifi module */
>>>>>  	w3cbw003c_npoweron: regulator-w3cbw003c-npoweron {
>>>>>  		compatible = "regulator-fixed";
>>>>> @@ -64,6 +82,11 @@
>>>>>  };
>>>>>  
>>>>>  &omap3_pmx_core {
>>>>> +	pinctrl-names = "default";
>>>>> +	pinctrl-0 = <
>>>>> +			&hsusb2_pins
>>>>> +	>;
>>>>> +
>>>>>  	uart3_pins: pinmux_uart3_pins {
>>>>>  		pinctrl-single,pins = <
>>>>>  			OMAP3_CORE1_IOPAD(0x219e, PIN_INPUT | PIN_OFF_WAKEUPENABLE | MUX_MODE0)	/* uart3_rx_irrx.uart3_rx_irrx */
>>>>> @@ -107,6 +130,19 @@
>>>>>  			OMAP3_CORE1_IOPAD(0x219c, PIN_OUTPUT | MUX_MODE4)		/* uart3_rts_sd.gpio_164 */
>>>>>  		>;
>>>>>  	};
>>>>> +
>>>>> +	hsusb2_pins: pinmux_hsusb2_pins {
>>>>> +		pinctrl-single,pins = <
>>>>> +			OMAP3_CORE1_IOPAD(0x21d4, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* mcspi1_cs3.hsusb2_data2 */
>>>>> +			OMAP3_CORE1_IOPAD(0x21d6, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* mcspi2_clk.hsusb2_data7 */
>>>>> +			OMAP3_CORE1_IOPAD(0x21d8, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* mcspi2_simo.hsusb2_data4 */
>>>>> +			OMAP3_CORE1_IOPAD(0x21da, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* mcspi2_somi.hsusb2_data5 */
>>>>> +			OMAP3_CORE1_IOPAD(0x21dc, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* mcspi2_cs0.hsusb2_data6 */
>>>>> +			OMAP3_CORE1_IOPAD(0x21de, PIN_INPUT_PULLDOWN | MUX_MODE3)	/* mcspi2_cs1.hsusb2_data3 */
>>>>> +			OMAP3_CORE1_IOPAD(0x21be, PIN_OUTPUT | MUX_MODE4)		/* i2c2_scl.gpio_168 */
>>>>> +			OMAP3_CORE1_IOPAD(0x21c0, PIN_OUTPUT | MUX_MODE4)		/* i2c2_sda.gpio_183 */
>>>>> +		>;
>>>>> +	};
>>>>
>>>> Does this mean all overo variants use the USB host feature on hsusb2 pins? If not then this can't be here.
>>>>
>>>
>>> Yes, they all does have USB host on hsusb2.
>>>
>>>> If yes then I didn't understand why the hsusb2 pinmux is split up half here and half in "omap3-overo-tobi.dts"
>>>> and "omap3-overo-storm-tobi.dts"
>>>>
>>>
>>> Some of the pads are in the omap3_pmx_core2 domain. The exact offset of
>>> the pin inside the pinctrl domain depends on the OMAP3 version, hence
>>> the use of OMAP3430_CORE2_IOPAD and OMAP3630_CORE2_IOPAD macros.
>>>
>>> Now some Overo depends on omap34xx (regular overo), others on omap36xx
>>> (overo-storm). Commit f03ef09 "ARM: dts: Add support for both OMAP35xx
>>> and OMAP36xx Overo/Tobi" made omap3-overo.dtsi independent from the
>>> OMAP3 revision, and pushed these details down to the Tobi board files.
>>> This is why the pinmux related to the omap3_pmx_core2 domain is there.
>>>
>>
>> But we can still have the omap3_pmx_core2 part along with the omap3_pmx_core part
>> for hsusb pins in the omap3-overo-tobi-common.dtsi, right? That way we limit
>> usb host feature for TOBI variants only.
>>
>> The tobi variant's dts file seems to include the right OMAP3430 vs 3630 SoC dtsi before the
>> omap3-overo-tobi-common.dtsi, so the pinctrl address will be taken care of there.
>>
>>> As long as we have only one expansion board, I think that this is ok. I
>>> wanted to avoid an excessive fragmentation of the DTSI files. But when
>>> adding new expansion boards, it will be necessary to create yet another
>>> indirection layer to address this issue and avoid duplicated DT data.
>>
>> Putting usb host pins in omap3-overo.dtsi implies that all Overo expansion boards will use it
>> but that is not always the case. Any expansion board vendor can decide not to use USB host feature.
>>
> 
> I do agree that this can be the case. So it makes sense to push the
> USB host down to expansion boards.
> 

In fact, I was wrong here, since the USB controller is embedded on the
processor board. The ULPI pins are not available to the expansion
boards, so disabling the host USB will make no difference on the
expansion connector.

Anyway, I have to reorganize a bit the pinmux definitions.