linux-kernel - Re: [PATCH_V2 15/34] dt: clk: Add ingenic,jz4740-cgu binding documentation

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Date:	Wed, 04 Feb 2015 17:27:23 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>
Cc:	linux-mips@...ux-mips.org, devicetree@...r.kernel.org,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, mturquette@...aro.org,
	sboyd@...eaurora.org, ralf@...ux-mips.org, jslaby@...e.cz,
	tglx@...utronix.de, jason@...edaemon.net, lars@...afoo.de,
	paul.burton@...tec.com
Subject: Re: [PATCH_V2 15/34] dt: clk: Add ingenic,jz4740-cgu binding documentation

On Wednesday 04 February 2015 15:21:44 Zubair Lutfullah Kakakhel wrote:
> 
> +/ {
> +       ext: clock@0 {
> +               compatible = "fixed-clock";
> +               #clock-cells = <0>;
> +               clock-frequency = <12000000>;
> +       };
> +
> +       rtc: clock@1 {
> +               compatible = "fixed-clock";
> +               #clock-cells = <0>;
> +               clock-frequency = <32768>;
> +       };
> +
> +       &cgu {
> +               clocks = <&ext> <&rtc>;
> +               clock-names: "ext", "rtc";
> +       };
> +};
> diff --git a/include/dt-bindings/clock/jz4740-cgu.h b/include/dt-bindings/clock/jz4740-cgu.h
> new file mode 100644
> index 0000000..43153d3
> --- /dev/null
> +++ b/include/dt-bindings/clock/jz4740-cgu.h
> @@ -0,0 +1,37 @@
> +/*
> + * This header provides clock numbers for the ingenic,jz4740-cgu DT binding.
> + *
> + * They are roughly ordered as:
> + *   - external clocks
> + *   - PLLs
> + *   - muxes/dividers in the order they appear in the jz4740 programmers manual
> + *   - gates in order of their bit in the CLKGR* registers
> + */
> +
> +#ifndef __DT_BINDINGS_CLOCK_JZ4740_CGU_H__
> +#define __DT_BINDINGS_CLOCK_JZ4740_CGU_H__
> +
> +#define JZ4740_CLK_EXT         0
> +#define JZ4740_CLK_RTC         1
> +#define JZ4740_CLK_PLL         2
> +#define JZ4740_CLK_PLL_HALF    3

So there are fixed clocks for ext and rtc that are used as inputs
to the cgu, but also outputs with the same name. How do these relate?

	Arnd
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