From: Kamil Debski <k.debski@samsung.com>
To: 'Anton Tikhomirov' <av.tikhomirov@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: Tue, 17 Dec 2013 14:26:37 +0100 [thread overview]
Message-ID: <02d201cefb2b$9e04e710$da0eb530$%debski@samsung.com> (raw)
In-Reply-To: <006a01cef551$7fb4e240$7f1ea6c0$%tikhomirov@samsung.com>
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.
[snip]
Best wishes,
--
Kamil Debski
Samsung R&D Institute Poland
next prev parent reply other threads:[~2013-12-17 13:26 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 PHY driver Kamil Debski
2013-12-05 12:29 ` [PATCH 1/9] phy: core: Change the way of_phy_get is called Kamil Debski
[not found] ` <1386246579-25141-2-git-send-email-k.debski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2013-12-06 5:30 ` Kishon Vijay Abraham I
[not found] ` <52A16104.3080704-l0cyMroinI0@public.gmane.org>
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 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
[not found] ` <52A1B0F7.2050501-l0cyMroinI0@public.gmane.org>
2013-12-06 15:01 ` Matt Porter
2013-12-06 16:29 ` Kamil Debski
2013-12-11 15:15 ` Matt Porter
[not found] ` <1386246579-25141-6-git-send-email-k.debski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
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
[not found] ` <1386246579-25141-1-git-send-email-k.debski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2013-12-05 12:29 ` [PATCH v4 3/9] phy: Add new " 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 [this message]
2013-12-18 0:54 ` Anton Tikhomirov
2013-12-06 10:32 ` [PATCH v4 7/9] phy: Add Exynos 5250 support to the Exynos USB 2.0 " Kamil Debski
[not found] ` <1386325955-27322-1-git-send-email-k.debski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2013-12-06 11:15 ` Kishon Vijay Abraham I
2013-12-06 10:34 ` [PATCH 9/9] dts: Add usb2phy to Exynos 5250 Kamil Debski
2013-12-06 10:33 ` [PATCH 8/9] dts: Add usb2phy to Exynos 4 Kamil Debski
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