[PATCHv2 1/3] Documentation: dt: Add TI SCI clock driver

[Rob Herring]

On Thu, Sep 01, 2016 at 03:40:33PM +0300, Tero Kristo wrote:
> Add a clock implementation, TI SCI clock, that will hook to the common
> clock framework, and allow each clock to be controlled via TI SCI
> protocol.
> 
> Signed-off-by: Tero Kristo <t-kristo at ti.com>
> Tested-by: Dave Gerlach <d-gerlach at ti.com>
> Signed-off-by: Nishanth Menon <nm at ti.com>
> ---
>  .../devicetree/bindings/clock/ti,sci-clk.txt       | 51 ++++++++++++++++++++++
>  MAINTAINERS                                        |  1 +
>  2 files changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/ti,sci-clk.txt
> 
> diff --git a/Documentation/devicetree/bindings/clock/ti,sci-clk.txt b/Documentation/devicetree/bindings/clock/ti,sci-clk.txt
> new file mode 100644
> index 0000000..231cb80
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/ti,sci-clk.txt
> @@ -0,0 +1,51 @@
> +Texas Instruments TI-SCI Clocks
> +===============================
> +
> +All clocks on Texas Instruments' SoCs that contain a System Controller,
> +are only controlled by this entity. Communication between a host processor
> +running an OS and the System Controller happens through a protocol known
> +as TI-SCI[1]. This clock implementation plugs into the common clock
> +framework and makes use of the TI-SCI protocol on clock API requests.
> +
> +[1] Documentation/devicetree/bindings/arm/keystone/ti,sci.txt
> +
> +Required properties:
> +-------------------
> +- compatible: Must be "ti,sci-clk"
> +- #clock-cells: Shall be 2.
> +  In clock consumers, this cell represents the device ID and clock ID
> +  exposed by the PM firmware. The assignments can be found in the header
> +  files <dt-bindings/genpd/<soc>.h> (which covers the device IDs) and
> +  <dt-bindings/clock/<soc>.h> (which covers the clock IDs), where <soc>
> +  is the SoC involved, for example 'k2g'.
> +- ti,sci: Phandle to the TI SCI device to use for managing the clocks
> +
> +Optional properties:
> +-------------------
> +- ti,ssc-clocks: Array of phandle clocks that shall enable spread spectrum
> +		 clocking while enabled
> +- ti,allow-freq-change-clocks: Array of phandle clocks that shall allow
> +			       dynamic clock frequency changes by firmware
> +- ti,input-term-clocks: Array of phandle clocks that shall enable input
> +			termination

These seem like a random set of features to control. What determines the 
clocks for these? If it is based on the SoC, then make your compatible 
string SoC specific and don't put this into DT.

Rob