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Message-ID: <2815679.ZycfkLhBgI@wuerfel> Date: Tue, 29 Jul 2014 16:44:31 +0200 From: Arnd Bergmann <arnd@...db.de> To: linux-arm-kernel@...ts.infradead.org Cc: Stefan Agner <stefan@...er.ch>, shawn.guo@...escale.com, kernel@...gutronix.de, peter.chen@...escale.com, linux-kernel@...r.kernel.org, jingchang.lu@...escale.com Subject: Re: [PATCH] ARM: imx: clk-vf610: introduce clks_init_on On Tuesday 29 July 2014 16:20:28 Stefan Agner wrote: > At the end of the boot process, the clock framework might disable > required main PLL's. So far, this was no issue since drivers > requested clocks, which are descended of the main PLL's (e.g. > pll1_pfd1, which provides the system clock). > > To archive the full 500MHz system clock, DDR clock need to be a > descendant of PLL2 rather than PLL1 (DDRC_CLK_SEL set to 0). The > bootloader sets up the clocks accordingly before making use of > DDR at all. However, in Linux, there is no driver using PLL2, > which lead to PLL2 being disabled by the clock framework. > > With this patch, we make sure that the main system clock and the > DDR clock are initially enabled and are kept enabled. > > Signed-off-by: Stefan Agner <stefan@...er.ch> > Wouldn't it be better to list this in the DT as a default for the respective clocks? Arnd -- 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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