On Sat, Mar 23, 2019 at 10:01:24PM +0800, qiaozhou wrote:
> From: Qiao Zhou <qiaozhou@xxxxxxxxxxxx>
>
> Add binding documentation for ASR8751C clocks, which are general gating
> fixed rate and fixed ratio clocks derived from system PLL, external
> oscillator. These clocks control registers are distributed on different
> sub-controller-unit on SoCs, like APMU, MPMU, CIU etc.
>
> Signed-off-by: qiaozhou <qiaozhou@xxxxxxxxxxxx>
> ---
> .../devicetree/bindings/clock/asr,clock.txt | 31 ++++++++++++++++++++++
> 1 file changed, 31 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/clock/asr,clock.txt
Patch 5 can be combined with this one. It is part of the binding.
>
> diff --git a/Documentation/devicetree/bindings/clock/asr,clock.txt b/Documentation/devicetree/bindings/clock/asr,clock.txt
> new file mode 100644
> index 0000000..93082a4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/asr,clock.txt
> @@ -0,0 +1,31 @@
> +* Clock Controller of ASR8751C SoCs
> +
> +clock subsystem generates and supplies clock to various controllers within the
> +ASR8751C SoC.
> +
> +Required Properties:
> +
> +- compatible: should be "asr,8751c-clock"
> +
> +- reg: iomem address and length of the clock subsystem. There are 7 places in
> + SOC has clock control logic: "mpmu", "apmu", "apbc", "apbs", "ciu", "dciu",
> + "ddrc".
You should probably have a node for each of these blocks if they are
separate blocks. DT nodes should match h/w blocks.
> +- reg-names: register names of each sub control logic.
> +- interrupts : Should be the interrupt number
However, how do all the blocks have a single interrupt unless it's a
shared interrupt.
> +- #clock-cells: should be 1.
Clock controllers need some input clocks to have any output clocks.
> +
> +Example:
> +
> + soc_clocks: clocks@d4050000{
> + compatible = "asr,8751c-clock";
> + reg = <0x0 0xd4050000 0x0 0x209c>,
> + <0x0 0xd4282800 0x0 0x400>,
> + <0x0 0xd4015000 0x0 0x1000>,
> + <0x0 0xd4090000 0x0 0x1000>,
> + <0x0 0xd4282c00 0x0 0x400>,
> + <0x0 0xd8440000 0x0 0x98>,
> + <0x0 0xd4200000 0x0 0x4280>;
> + reg-names = "mpmu", "apmu", "apbc", "apbs", "ciu", "dciu", "ddrc";
> + interrupts = <0 96 IRQ_TYPE_LEVEL_HIGH>;
> + #clock-cells = <1>;
> + };
> --
> 2.7.4
>
