On Wed, Jan 18, 2017 at 04:29:32PM -0800, Markus Mayer wrote:
> From: Markus Mayer <mma...@broadcom.com>
>
> Add binding document for brcm,brcmstb-cpu-clk-div.
>
> Signed-off-by: Markus Mayer <mma...@broadcom.com>
> ---
> .../bindings/clock/brcm,brcmstb-cpu-clk-div.txt | 27
> ++++++++++++++++++++++
> MAINTAINERS | 1 +
> 2 files changed, 28 insertions(+)
> create mode 100644
> Documentation/devicetree/bindings/clock/brcm,brcmstb-cpu-clk-div.txt
>
> 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
Why do you need 2 values? Can't you use the index or calculate the
register value from the divider value?
> +- div-shift-width: least-significant bit position and width of divider value
> +
> +Optional properties:
> +- clock-names: the clock may be named
> +
> +Example:
> + cpuclkdiv: cpu-clk-div@f03e257c {
clock-controller@...
> + compatible = "brcm,brcmstb-cpu-clk-div";
> + reg = <0xf03e257c 0x4>;
> + div-table = <0x00 1>;
> + div-shift-width = <0 5>;
> + #clock-cells = <0>;
> + clocks = <&cpupll>;
> + clock-names = "cpupll";
> + };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index cfff2c9..690761d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2786,6 +2786,7 @@ M: bcm-kernel-feedback-l...@broadcom.com
> L: linux...@vger.kernel.org
> S: Maintained
> F: Documentation/devicetree/bindings/cpufreq/brcm,stb-avs-cpu-freq.txt
> +F: Documentation/devicetree/bindings/clock/brcm,brcmstb-cpu-clk-div.txt
> F: drivers/cpufreq/brcmstb*
>
> BROADCOM SPECIFIC AMBA DRIVER (BCMA)
> --
> 2.7.4
>
