linux-kernel - Re: [PATCH 1/7] phy: exynos-usb2: add vbus regulator support

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Date:	Thu, 27 Aug 2015 15:24:28 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-samsung-soc@...r.kernel.org>
CC:	Robert Baldyga <r.baldyga@...sung.com>,
	John Youn <johnyoun@...opsys.com>,
	Kukjin Kim <kgene@...nel.org>,
	Kamil Debski <k.debski@...sung.com>
Subject: Re: [PATCH 1/7] phy: exynos-usb2: add vbus regulator support

Hi,

On Tuesday 25 August 2015 11:42 AM, Krzysztof Kozlowski wrote:
> On 25.08.2015 14:47, Marek Szyprowski wrote:
>> Hello,
>>
>> On 2015-08-21 14:44, Kishon Vijay Abraham I wrote:
>>> On Friday 21 August 2015 06:08 PM, Marek Szyprowski wrote:
>>>> Exynos USB2 PHY has separate power supply, which is usually provided by
>>>> VBUS regulator. This patch adds support for it. VBUS regulator is
>>>> optional, to keep compatibility with boards, which have VBUS provided
>>>> from some always-on power source.
>>>>
>>>> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
>>>> ---
>>>>   .../devicetree/bindings/phy/samsung-phy.txt        |  3 +++
>>>>   drivers/phy/phy-samsung-usb2.c                     | 25
>>>> ++++++++++++++++++++--
>>>>   drivers/phy/phy-samsung-usb2.h                     |  2 ++
>>>>   3 files changed, 28 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>>> b/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>>> index 60c6f2a633e0..0289d3b07853 100644
>>>> --- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>>> +++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>>> @@ -44,6 +44,9 @@ Required properties:
>>>>       - the "ref" clock is used to get the rate of the clock provided
>>>> to the
>>>>         PHY module
>>>>   +Optional properties:
>>>> +- vbus-supply: power-supply phandle for vbus power source
>>> how about using phy-supply?
>>
>> I wanted to make it a bit more descriptive (vbus-supply is rather self
>> explaining name)
>> and keep it in line with Exynos usb3-drd phy, which already supports
>> vbus-supply.
>> If you think that this is a bad idea, a will use phy-supply then.
> 
> This is actually supply for VBUS, not for the phy. Using phy-supply
> would work fine and reduce the size of code... but would be rather a
> hacky-use of phy and it could be misleading.
> 
> I don't have strong feeling about this, both ideas have its advantages.
> If I had to choose than I would like to use vbus-supply because of its
> correctness with real-world (this is a VBUS after all).

Alright.. lets use vbus-supply then.

Thanks
Kishon
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