Documentation: dt: Add TI SCI clock driver

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@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/Documentation/devicetree/bindings/clock/ti,sci-clk.txt b/Documentation/devicetree/bindings/clock/ti,sci-clk.txt
new file mode 100644 (file)
index 0000000..1e884c4
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/ti,sci-clk.txt
@@ -0,0 +1,37 @@
+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,k2g-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'.
+
+Examples:
+--------
+
+pmmc: pmmc {
+       compatible = "ti,k2g-sci";
+
+       k2g_clks: clocks {
+               compatible = "ti,k2g-sci-clk";
+               #clock-cells = <2>;
+       };
+};
+
+uart0: serial@2530c00 {
+       compatible = "ns16550a";
+       clocks = <&k2g_clks 0x2c 0>;
+};

diff --git a/MAINTAINERS b/MAINTAINERS
index f7d568b8f133d9919e3823c102d7ac78f89c894a..880a23d208ff5ec1602d7f661afa37a95a0f9f28 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12630,6 +12630,7 @@ F:      include/linux/soc/ti/ti_sci_protocol.h
 F:     Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt
 F:     include/dt-bindings/genpd/k2g.h
 F:     drivers/soc/ti/ti_sci_pm_domains.c
+F:     Documentation/devicetree/bindings/clock/ti,sci-clk.txt
 
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