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

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Message-id: <55DC073D.8050909@samsung.com>
Date:	Tue, 25 Aug 2015 15:12:13 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kishon Vijay Abraham I <kishon@...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

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).

Best regards,
Krzysztof
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