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Date: Sun, 29 Nov 2015 11:03:10 +0800 From: Chen-Yu Tsai <wens@...e.org> To: Maxime Ripard <maxime.ripard@...e-electrons.com>, Emilio Lopez <emilio@...pez.com.ar>, Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...eaurora.org>, Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>, Mark Rutland <mark.rutland@....com>, Ian Campbell <ijc+devicetree@...lion.org.uk>, Kumar Gala <galak@...eaurora.org> Cc: linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, linux-sunxi@...glegroups.com, Chen-Yu Tsai <wens@...e.org> Subject: [PATCH v4 5/5] ARM: dts: sun9i: Add TODO comments for the main and low power clocks The main (24MHz) clock on the A80 is configurable via the PRCM address space. The low power/speed (32kHz) clock is from an external chip, the AC100. Signed-off-by: Chen-Yu Tsai <wens@...e.org> --- arch/arm/boot/dts/sun9i-a80.dtsi | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/arch/arm/boot/dts/sun9i-a80.dtsi b/arch/arm/boot/dts/sun9i-a80.dtsi index a4ce348c0831..eb69a62f6bc4 100644 --- a/arch/arm/boot/dts/sun9i-a80.dtsi +++ b/arch/arm/boot/dts/sun9i-a80.dtsi @@ -128,6 +128,17 @@ */ ranges = <0 0 0 0x20000000>; + /* + * This clock is actually configurable from the PRCM address + * space. The external 24M oscillator can be turned off, and + * the clock switched to an internal 16M RC oscillator. Under + * normal operation there's no reason to do this, and the + * default is to use the external good one, so just model this + * as a fixed clock. Also it is not entirely clear if the + * osc24M mux in the PRCM affects the entire clock tree, which + * would also throw all the PLL clock rates off, or just the + * downstream clocks in the PRCM. + */ osc24M: osc24M_clk { #clock-cells = <0>; compatible = "fixed-clock"; @@ -135,6 +146,13 @@ clock-output-names = "osc24M"; }; + /* + * The 32k clock is from an external source, normally the + * AC100 codec/RTC chip. This clock is by default enabled + * and clocked at 32768 Hz, from the oscillator connected + * to the AC100. It is configurable, but no such driver or + * bindings exist yet. + */ osc32k: osc32k_clk { #clock-cells = <0>; compatible = "fixed-clock"; -- 2.6.2 -- 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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