linux-kernel - Re: [PATCH v5 1/2] dt-bindings: brcm: clocks: add binding for brcmstb-cpu-clk-div

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Message-ID: <20170121005202.GB8801@codeaurora.org>
Date:   Fri, 20 Jan 2017 16:52:02 -0800
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Markus Mayer <code@...yer.net>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Arnd Bergmann <arnd@...db.de>,
        Markus Mayer <mmayer@...adcom.com>,
        Broadcom Kernel List <bcm-kernel-feedback-list@...adcom.com>,
        Linux Clock List <linux-clk@...r.kernel.org>,
        Power Management List <linux-pm@...r.kernel.org>,
        Device Tree List <devicetree@...r.kernel.org>,
        ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] dt-bindings: brcm: clocks: add binding for
 brcmstb-cpu-clk-div

On 01/18, Markus Mayer wrote:
> diff --git a/Documentation/devicetree/bindings/clock/brcm,brcmstb-cpu-clk-div.txt b/Documentation/devicetree/bindings/clock/brcm,brcmstb-cpu-clk-div.txt
> new file mode 100644
> index 0000000..c4acb53
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/brcm,brcmstb-cpu-clk-div.txt
> @@ -0,0 +1,27 @@
> +The CPU divider node serves as the sole clock for the CPU complex. It supports
> +power-of-2 clock division, with a divider of "1" as the default highest-speed
> +setting.
> +
> +Required properties:
> +- compatible: shall be "brcm,brcmstb-cpu-clk-div"
> +- reg: address and width of the divider configuration register
> +- #clock-cells: shall be set to 0
> +- clocks: phandle of clock provider which provides the source clock
> +          (this would typically be a "fixed-clock" type PLL)
> +- div-table: list of (raw_value,divider) ordered pairs that correspond to the
> +             allowed clock divider settings
> +- div-shift-width: least-significant bit position and width of divider value

Are these properties used? Please don't put these types of
details in DT.

> +
> +Optional properties:
> +- clock-names: the clock may be named
> +
> +Example:
> +	cpuclkdiv: cpu-clk-div@...e257c {
> +		compatible = "brcm,brcmstb-cpu-clk-div";
> +		reg = <0xf03e257c 0x4>;

This register really looks like some offset in something larger.
Is there some clock controller? What's the hw block at
0xf03e2000? Maybe I already asked this.

> +		div-table = <0x00 1>;
> +		div-shift-width = <0 5>;
> +		#clock-cells = <0>;
> +		clocks = <&cpupll>;
> +		clock-names = "cpupll";
> +	};
> 

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