On 12/09/16 16:10, Rob Herring wrote:
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@xxxxxx>
Tested-by: Dave Gerlach <d-gerlach@xxxxxx>
Signed-off-by: Nishanth Menon <nm@xxxxxx>
---
.../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.
Currently nobody seems to be using these flags, so I will just drop the
support for these from the next rev. If anybody will need them at some
point, I will figure out how to support these.
-Tero
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
