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

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Message-ID: <531738FF.5050902@ti.com>
Date:	Wed, 5 Mar 2014 20:17:27 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Roger Quadros <rogerq@...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

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

Thanks
Kishon
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