From: Anton Tikhomirov <av.tikhomirov@samsung.com>
To: "'Kamil Debski'" <k.debski@samsung.com>,
linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
linux-usb@vger.kernel.org, devicetree@vger.kernel.org
Cc: kyungmin.park@samsung.com, kishon@ti.com,
"'Tomasz Figa'" <t.figa@samsung.com>,
"'Sylwester Nawrocki'" <s.nawrocki@samsung.com>,
"'Marek Szyprowski'" <m.szyprowski@samsung.com>,
gautam.vivek@samsung.com, mat.krawczuk@gmail.com,
yulgon.kim@samsung.com, p.paneri@samsung.com,
jg1.han@samsung.com, galak@codeaurora.org,
matt.porter@linaro.org
Subject: RE: [PATCH v4 3/9] phy: Add new Exynos USB PHY driver
Date: Wed, 18 Dec 2013 09:54:33 +0900 [thread overview]
Message-ID: <001701cefb8b$b78a8ea0$269fabe0$%tikhomirov@samsung.com> (raw)
In-Reply-To: <02d201cefb2b$9e04e710$da0eb530$%debski@samsung.com>
Hi Kamil,
> Hi Anton,
>
> > From: Anton Tikhomirov [mailto:av.tikhomirov@samsung.com]
> > Sent: Tuesday, December 10, 2013 3:43 AM
> >
> > Hi Kamil,
> >
> > Same USB2.0 PHY may be used by several HCDs, for example EHCI and
> OHCI.
> > Consider the situation, when EHCI stops using the PHY and calls
> > power_off, then OHCI becomes non-operational. In other words, PHY
> > power_on and power_off calls must be balanced.
> >
> > Shall we handle it in your driver? (usage count?)
>
> Please look in the drivers/phy/phy-core.c file. Usage count is handled
> there - see phy_power_on and phy_power_off functions. I understand that
> after both EHCI and OHCI power on the phy, the usage count is 2. So
> powering off one of them (EHCI for instance) the usage count is still
> 1, so the OHCI should still work properly.
Oops, sorry, missed that.
>
> [snip]
>
> Best wishes,
> --
> Kamil Debski
> Samsung R&D Institute Poland
next prev parent reply other threads:[~2013-12-18 0:54 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-05 12:29 [PATCH v4 0/9] phy: Add new Exynos USB 2.0 " Kamil Debski
2013-12-05 12:29 ` [PATCH 1/9] phy: core: Change the way of_phy_get is called Kamil Debski
2013-12-06 5:30 ` Kishon Vijay Abraham I
2013-12-06 10:52 ` Kamil Debski
2013-12-09 7:22 ` Kishon Vijay Abraham I
2013-12-13 14:20 ` Kamil Debski
2013-12-05 12:29 ` [PATCH 2/9] phy: core: Add devm_of_phy_get to phy-core Kamil Debski
2013-12-05 12:29 ` [PATCH v4 3/9] phy: Add new Exynos USB PHY driver Kamil Debski
2013-12-06 10:59 ` Kishon Vijay Abraham I
2013-12-06 16:28 ` Kamil Debski
2013-12-09 7:56 ` Kishon Vijay Abraham I
2013-12-09 13:35 ` Kamil Debski
2013-12-06 16:47 ` Kamil Debski
2013-12-10 2:42 ` Anton Tikhomirov
2013-12-17 13:26 ` Kamil Debski
2013-12-18 0:54 ` Anton Tikhomirov [this message]
2013-12-05 12:29 ` [PATCH v4 4/9] usb: ehci-s5p: Change to use phy provided by the generic phy framework Kamil Debski
2013-12-05 18:52 ` Alan Stern
2013-12-06 13:19 ` Kamil Debski
2013-12-05 12:29 ` [PATCH v4 5/9] usb: s3c-hsotg: Use the new Exynos USB phy driver with " Kamil Debski
2013-12-06 11:11 ` Kishon Vijay Abraham I
2013-12-06 15:01 ` Matt Porter
2013-12-06 16:29 ` Kamil Debski
2013-12-11 15:15 ` Matt Porter
2013-12-16 21:40 ` Matt Porter
2013-12-17 9:41 ` Kamil Debski
2013-12-17 13:13 ` 'Matt Porter'
2013-12-05 15:07 ` [PATCH v4 0/9] phy: Add new Exynos USB 2.0 PHY driver Kishon Vijay Abraham I
2013-12-06 10:51 ` Kamil Debski
2013-12-06 10:31 ` [PATCH v4 6/9] phy: Add support for S5PV210 to the Exynos USB " Kamil Debski
2013-12-06 11:14 ` Kishon Vijay Abraham I
2013-12-06 10:32 ` [PATCH v4 7/9] phy: Add Exynos 5250 support to the Exynos USB 2.0 " Kamil Debski
2013-12-06 11:15 ` Kishon Vijay Abraham I
2013-12-06 10:33 ` [PATCH 8/9] dts: Add usb2phy to Exynos 4 Kamil Debski
2013-12-06 10:34 ` [PATCH 9/9] dts: Add usb2phy to Exynos 5250 Kamil Debski
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