Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755245AbbHFI7x (ORCPT ); Thu, 6 Aug 2015 04:59:53 -0400 Received: from metis.ext.pengutronix.de ([92.198.50.35]:48137 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755057AbbHFI7v (ORCPT ); Thu, 6 Aug 2015 04:59:51 -0400 Date: Thu, 6 Aug 2015 10:59:36 +0200 From: Sascha Hauer To: James Liao Cc: Matthias Brugger , Mike Turquette , Stephen Boyd , Heiko Stubner , devicetree@vger.kernel.org, srv_heupstream@mediatek.com, linux-kernel@vger.kernel.org, Daniel Kurtz , Ricky Liang , Rob Herring , linux-mediatek@lists.infradead.org, Sascha Hauer , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v6 5/9] clk: mediatek: Fix rate and dependency of MT8173 clocks Message-ID: <20150806085936.GO18700@pengutronix.de> References: <1438676218-11310-1-git-send-email-jamesjj.liao@mediatek.com> <1438676218-11310-6-git-send-email-jamesjj.liao@mediatek.com> <20150805065341.GA18700@pengutronix.de> <1438850132.27884.17.camel@mtksdaap41> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1438850132.27884.17.camel@mtksdaap41> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-IRC: #ptxdist @freenode X-Accept-Language: de,en X-Accept-Content-Type: text/plain X-Uptime: 10:59:16 up 42 days, 3:20, 106 users, load average: 0.04, 0.11, 0.13 User-Agent: Mutt/1.5.21 (2010-09-15) X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::c0 X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1895 Lines: 40 On Thu, Aug 06, 2015 at 04:35:32PM +0800, James Liao wrote: > Hi Sascha, > > On Wed, 2015-08-05 at 08:53 +0200, Sascha Hauer wrote: > > On Tue, Aug 04, 2015 at 04:16:54PM +0800, James Liao wrote: > > > -static const struct mtk_fixed_factor root_clk_alias[] __initconst = { > > > - FACTOR(CLK_TOP_CLKPH_MCK_O, "clkph_mck_o", "clk_null", 1, 1), > > > - FACTOR(CLK_TOP_USB_SYSPLL_125M, "usb_syspll_125m", "clk_null", 1, 1), > > > - FACTOR(CLK_TOP_HDMITX_DIG_CTS, "hdmitx_dig_cts", "clk_null", 1, 1), > > > +static const struct mtk_fixed_clk fixed_clks[] __initconst = { > > > + FIXED_CLK(CLK_TOP_CLKPH_MCK_O, "clkph_mck_o", "clk26m", 400 * MHZ), > > > + FIXED_CLK(CLK_TOP_USB_SYSPLL_125M, "usb_syspll_125m", "clk26m", 125 * MHZ), > > > > Hm, it seems you hide PLLs in fixed factor clock. Are you sure that > > there is a PLL in the system generating 125MHz from 26MHz which is in no > > way configurable? Or is this really some clock derived from the syspll > > as the clock name suggests? > > According to the datasheet from our clock designer, usb_syspll_125m is > the output clock of an analog macro which is named SSUSB_PHY, and its > input clock is AD_CLK26M_CK. > > SSUSB_PHY is not the same as general PLLs such as MAINPLL. So I don't > treat it as a configurable PLL but a fixed clock with the typical rate > 125 MHz. Ok then. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/