linux-kernel - Re: [PATCH 7/8] ARM: dts: dra7: Add USB related nodes

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Date:	Fri, 14 Mar 2014 17:34:29 +0200
From:	Roger Quadros <rogerq@...com>
To:	Kishon Vijay Abraham I <kishon@...com>, <balbi@...com>,
	<tony@...mide.com>
CC:	<george.cherian@...com>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: [PATCH 7/8] ARM: dts: dra7: Add USB related nodes

On 03/14/2014 04:54 PM, Kishon Vijay Abraham I wrote:
> 
> 
> On Friday 14 March 2014 05:41 PM, Roger Quadros wrote:
>> On 03/14/2014 12:38 PM, Kishon Vijay Abraham I wrote:
>>> Hi Roger,
>>>
>>> On Friday 07 March 2014 06:39 PM, Roger Quadros wrote:
>>>> Add nodes for the Super Speed USB controllers, omap-control-usb,
>>>> USB2 PHY and USB3 PHY devices.
>>>>
>>>> Remove ocp2scp1 address space from hwmod data as it is
>>>> now provided via device tree.
>>>>
>>>> Signed-off-by: Roger Quadros <rogerq@...com>
>>>> ---
>>>>    arch/arm/boot/dts/dra7.dtsi               | 110 ++++++++++++++++++++++++++++++
>>>>    arch/arm/mach-omap2/omap_hwmod_7xx_data.c |  10 ---
>>>>    2 files changed, 110 insertions(+), 10 deletions(-)
>>>>
>>>> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
>>>> index 597979b..1e73900 100644
>>>> --- a/arch/arm/boot/dts/dra7.dtsi
>>>> +++ b/arch/arm/boot/dts/dra7.dtsi
>>>> @@ -811,6 +811,116 @@
>>>>                clocks = <&sata_ref_clk>;
>>>>                ti,hwmods = "sata";
>>>>            };
>>>> +
>>>> +        omap_control_usb2phy1: control-phy@...02300 {
>>>> +            compatible = "ti,control-phy-usb2";
>>>> +            reg = <0x4a002300 0x4>;
>>>> +            reg-names = "power";
>>>> +        };
>>>> +
>>>> +        omap_control_usb3phy1: control-phy@...02370 {
>>>> +            compatible = "ti,control-phy-pipe3";
>>>> +            reg = <0x4a002370 0x4>;
>>>> +            reg-names = "power";
>>>> +        };
>>>> +
>>>> +        omap_control_usb2phy2: control-phy@...a002e74 {
>>>> +            compatible = "ti,control-phy-usb2-dra7";
>>>> +            reg = <0x4a002e74 0x4>;
>>>> +            reg-names = "power";
>>>> +        };
>>>> +
>>>> +        /* OCP2SCP1 */
>>>> +        ocp2scp@...80000 {
>>>> +            compatible = "ti,omap-ocp2scp";
>>>> +            #address-cells = <1>;
>>>> +            #size-cells = <1>;
>>>> +            ranges;
>>>> +            reg = <0x4a080000 0x20>;
>>>> +            ti,hwmods = "ocp2scp1";
>>>> +
>>>> +            usb2_phy1: phy@...84000 {
>>>> +                compatible = "ti,omap-usb2";
>>>> +                reg = <0x4a084000 0x400>;
>>>> +                ctrl-module = <&omap_control_usb2phy1>;
>>>> +                clocks = <&usb_phy1_always_on_clk32k>,
>>>> +                     <&usb_otg_ss1_refclk960m>;
>>>> +                clock-names =    "wkupclk",
>>>> +                        "refclk";
>>>> +                #phy-cells = <0>;
>>>> +            };
>>>> +
>>>> +            usb2_phy2: phy@...85000 {
>>>> +                compatible = "ti,omap-usb2";
>>>> +                reg = <0x4a085000 0x400>;
>>>> +                ctrl-module = <&omap_control_usb2phy2>;
>>>> +                clocks = <&usb_phy2_always_on_clk32k>,
>>>> +                     <&usb_otg_ss2_refclk960m>;
>>>> +                clock-names =    "wkupclk",
>>>> +                        "refclk";
>>>> +                #phy-cells = <0>;
>>>> +            };
>>>> +
>>>> +            usb3_phy1: phy@...84400 {
>>>> +                compatible = "ti,omap-usb3";
>>>> +                reg = <0x4a084400 0x80>,
>>>> +                      <0x4a084800 0x64>,
>>>> +                      <0x4a084c00 0x40>;
>>>> +                reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>>>> +                ctrl-module = <&omap_control_usb3phy1>;
>>>> +                clocks = <&usb_phy3_always_on_clk32k>,
>>>> +                     <&sys_clkin1>,
>>>> +                     <&usb_otg_ss1_refclk960m>,
>>>> +                     <&dpll_core_h13x2_ck>;
>>>> +                clock-names =    "wkupclk",
>>>> +                        "sysclk",
>>>> +                        "refclk",
>>>> +                        "optclk";
>>>
>>> Do we use this 'optclk' in driver?
>>
>> No we don't. Still the device seems to work without it.
>> This is supposed to be USB_LFPS_TX_GFCLK or USB3PHY_REF_CLK.
> 
> I think it should be enabled. Did you check the status of this clock in CM_L3INIT_CLKSTCTRL? Moreover USB_LFPS_TX_GFCLK is an interface clock, so IIUC setting the module mode will enable it.
> 
> Btw how did you tell dpll_core_h13x2_ck enables USB_LFPS_TX_GFCLK?
> 

>From the clock tree tool. It looks like the clock is gated automatically with the module mode
as you suggested. I'll get rid of this clock reference then.

cheers,
-roger
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