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    SubjectRe: [RESEND PATCH 1/1] clk: add DT support for clock gating control
    On 07/13/2012 05:19 AM, Rob Herring wrote:
    > What's implemented in Linux should not define the binding. The binding
    > should describe the hardware.
    > [...]
    > True, but not your problem to implement. A binding doesn't necessarily
    > mean there is a full Linux implementation. We just don't want to create
    > something only to find others need something completely different.

    Ok, what about a DT describing the following for a simple register-based
    clock gating controller and the corresponding gated-clock independent of
    the controller. I am sure there are a bunch of SoCs out there that
    control their clock gates by writing some bits to a register. If that
    DT description matches your expectations, I ll prepare patches with
    documentation and implementation for common clock framework.

    Sebastian

    --
    /* Simple clock gating controller based on bitmasks and register */
    cgc: clock-gating-control@f1000000 {
    compatible = "clock-gating-control-register";
    reg = <0xf1000000 0x4>;

    /* Clock gating control with one bit at bit position 0
    enable with (1<<0), disable with (0<<0) */
    cgctrl_usb0: cgc_usb0 {
    clock-gating-control,shift = <0>;
    clock-gating-control,mask = <1>;
    clock-gating-control,enable = <1>;
    clock-gating-control,disable = <0>;
    };

    /* Clock gating control with two bits at bit position 1-2
    enable with (2<<1), disable with (0<<1) */
    cgctrl_sata: cgc_sata {
    clock-gating-control,shift = <1>;
    clock-gating-control,mask = <3>;
    clock-gating-control,enable = <2>;
    clock-gating-control,disable = <0>;
    };
    };

    /* Generic clock gate description that can be used with
    any clock gating controller */
    cg_usb0: clockgate@0 {
    compatible = "gated-clock";
    #clock-cells = <0>;
    clocks = <&osc>;
    clock-gate-control = <&cgctrl_usb0>;
    };


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