From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anton Tikhomirov Subject: RE: [PATCH v2 1/4] dwc3: exynos: Add support for SCLK present on Exynos7 Date: Tue, 14 Oct 2014 10:26:35 +0900 Message-ID: <001801cfe74d$e4cb23d0$ae616b70$%tikhomirov@samsung.com> References: <1412677176-3850-1-git-send-email-gautam.vivek@samsung.com> <1412677176-3850-2-git-send-email-gautam.vivek@samsung.com> <00f101cfe6a1$d772c5a0$865850e0$%tikhomirov@samsung.com> <543C575A.1030105@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ks_c_5601-1987 Content-Transfer-Encoding: 7bit Return-path: In-reply-to: <543C575A.1030105@gmail.com> Content-language: en-us Sender: linux-kernel-owner@vger.kernel.org To: 'Tomasz Figa' , 'Vivek Gautam' , linux-usb@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org, linux-omap@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, balbi@ti.com, kgene.kim@samsung.com, mark.rutland@arm.com, pawel.moll@arm.com, robh+dt@kernel.org, kishon@ti.com List-Id: devicetree@vger.kernel.org Hello, > Hi Anton, > > On 13.10.2014 06:54, Anton Tikhomirov wrote: > > Hi Vivek, > > > >> Exynos7 also has a separate special gate clock going to the IP > >> apart from the usual AHB clock. So add support for the same. > > > > As we discussed before, Exynos7 SoCs have 7 clocks to be controlled > > by the driver. Adding only sclk is not enough. > > > > I'm quite interested in this discussion. Has it happened on mailing > lists? No, we used company messenger for the discussion. > > In general, previous SoCs also gave the possibility of controlling all > the bus clocks separately, in addition to bulk gates, but there was no correct > real advantage in using those, while burdening the clock tree with > numerous clocks. Isn't Exynos7 similar in this aspect? Exynos7 doesn't have "Gating all clocks for USBDRD30" bit. The clocks should be controlled separately. > > Best regards, > Tomasz > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html