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Date: Tue, 19 Feb 2013 10:53:18 +0100 From: Daniel Mack <zonque@...il.com> To: Fabio Estevam <festevam@...il.com> CC: Mike Turquette <mturquette@...aro.org>, Russell King <linux@....linux.org.uk>, LKML <linux-kernel@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, Afzal Mohammed <x0148406@...com> Subject: Re: Question about fixed-clock Hi Fabio, Hi Afzal, On 19.02.2013 02:33, Fabio Estevam wrote: > On Mon, Feb 18, 2013 at 8:55 PM, Daniel Mack <zonque@...il.com> wrote: >> Hi, >> >> This might be a stupid question, but I'm somehow stuck here. I'm using a >> driver with the following DTS sub-node: >> >> ref25: ref25M { >> compatible = "fixed-clock"; >> #clock-cells = <0>; >> clock-frequency = <25000000>; >> }; >> >> clock-generator@0 { >> /* ... */ >> #clock-cells = <1>; >> clocks = <&ref25>; >> } >> >> The device driver for clock-generator uses something like the following >> call to get its clock: >> >> clk = of_clk_get(np, 0); >> >> but the return value is ERR_PTR(-ENOENT) and I also can't find this >> clock in the clk debugfs tree. >> >> This is on a OMAP/AM33xx device with kernel 3.8-rc7 plus the -next tips >> of arm-soc and omap, but with no other special clock options selected in >> the config. Is there anything I'm missing to correctly instantiate the >> dummy clock? > > Have you registered it with clk_register_fixed_rate() ? > > In imx we use imx_clk_fixed, which in turns call clk_register_fixed_rate(). > > Take a look at arch/arm/mach-imx/clk-imx51-imx53.c for a reference. Hmm no, I didn't do anything else than adding it to the DT in the first place, hoping that a driver will pick it up and add the clock for me. But it turns out that of_clk_init() is not called at all on my platform. I'm doing this now from omap_generic_init() and it works. If that's an appropriate place to call it, I can provide a patch. Thanks, Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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