linux-kernel - Re: [PATCH v5 2/6] usb: dwc3: adapt dwc3 core to use Generic PHY Framework

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Date:	Wed, 5 Mar 2014 17:24:54 +0200
From:	Roger Quadros <rogerq@...com>
To:	Kishon Vijay Abraham I <kishon@...com>, <bcousson@...libre.com>,
	<balbi@...com>, <devicetree@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, <george.cherian@...com>,
	<heikki.krogerus@...ux.intel.com>
CC:	<rob.herring@...xeda.com>, <pawel.moll@....com>,
	<mark.rutland@....com>, <swarren@...dotorg.org>,
	<ijc+devicetree@...lion.org.uk>, <rob@...dley.net>,
	<tony@...mide.com>, <linux@....linux.org.uk>,
	<gregkh@...uxfoundation.org>, <grant.likely@...aro.org>,
	<s.nawrocki@...sung.com>, <galak@...eaurora.org>
Subject: Re: [PATCH v5 2/6] usb: dwc3: adapt dwc3 core to use Generic PHY
 Framework

On 03/05/2014 04:47 PM, Kishon Vijay Abraham I wrote:
> Roger,
> 
> On Wednesday 05 March 2014 08:13 PM, Roger Quadros wrote:
>> Hi Kishon,
>>
>> On 03/03/2014 01:38 PM, Kishon Vijay Abraham I wrote:
>>> Adapted dwc3 core to use the Generic PHY Framework. So for init, exit,
>>> power_on and power_off the following APIs are used phy_init(), phy_exit(),
>>> phy_power_on() and phy_power_off().
>>>
>>> However using the old USB phy library wont be removed till the PHYs of all
>>> other SoC's using dwc3 core is adapted to the Generic PHY Framework.
>>>
>>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>>> ---
>>>   Documentation/devicetree/bindings/usb/dwc3.txt |    6 +-
>>>   drivers/usb/dwc3/core.c                        |   86 +++++++++++++++++++++---
>>>   drivers/usb/dwc3/core.h                        |    7 ++
>>>   3 files changed, 89 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
>>> index e807635..471366d 100644
>>> --- a/Documentation/devicetree/bindings/usb/dwc3.txt
>>> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt
>>> @@ -6,11 +6,13 @@ Required properties:
>>>    - compatible: must be "snps,dwc3"
>>>    - reg : Address and length of the register set for the device
>>>    - interrupts: Interrupts used by the dwc3 controller.
>>> +
>>> +Optional properties:
>>>    - usb-phy : array of phandle for the PHY device.  The first element
>>>      in the array is expected to be a handle to the USB2/HS PHY and
>>>      the second element is expected to be a handle to the USB3/SS PHY
>>> -
>>> -Optional properties:
>>> + - phys: from the *Generic PHY* bindings
>>> + - phy-names: from the *Generic PHY* bindings
>>>    - tx-fifo-resize: determines if the FIFO *has* to be reallocated.
>>>
>>>   This is usually a subnode to DWC3 glue to which it is connected.
>>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>>> index 225a4d6..497234a 100644
>>> --- a/drivers/usb/dwc3/core.c
>>> +++ b/drivers/usb/dwc3/core.c
>>> @@ -61,9 +61,10 @@ void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
>>>    * dwc3_core_soft_reset - Issues core soft reset and PHY reset
>>>    * @dwc: pointer to our context structure
>>>    */
>>> -static void dwc3_core_soft_reset(struct dwc3 *dwc)
>>> +static int dwc3_core_soft_reset(struct dwc3 *dwc)
>>>   {
>>>       u32        reg;
>>> +    int        ret;
>>>
>>>       /* Before Resetting PHY, put Core in Reset */
>>>       reg = dwc3_readl(dwc->regs, DWC3_GCTL);
>>> @@ -82,6 +83,15 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
>>>
>>>       usb_phy_init(dwc->usb2_phy);
>>>       usb_phy_init(dwc->usb3_phy);
>>> +    ret = phy_init(dwc->usb2_generic_phy);
>>
>> you need to check if dwc->usb?_generic_phy is not NULL before using any of the PHY APIs
>> throughout this patch.
> 
> Recently a patch to allow NULL in phy APIs was added to support optional PHYs.
> 
> commit 04c2facad8fee66c981a51852806d8923336f362
> Author: Andrew Lunn <andrew@...n.ch>
> Date:   Tue Feb 4 18:33:11 2014 +0100
> 
>     drivers: phy: Make NULL a valid phy reference

Oh OK, then it is fine. Thanks for the clarification.

cheers,
-roger
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