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Subject[PATCH net-next 01/10] dt-bindings: doc: net: keystone-netcp: document cpts
Date
The Keystone 2 66AK2HK/E/L 1G Ethernet Switch Subsystems contains The
Common Platform Time Sync (CPTS) module which is in general compatible with
CPTS module found on TI AM3/4/5 SoCs. So, the basic support for
Keystone 2 CPTS is available by default, but not documented.
The Keystone 2 CPTS module supports also some additional features like time
sync reference (RFTCLK) clock selection through CPTS_RFTCLK_SEL register
(offset: x08) in CPTS module, which is modelled as multiplexer clock.

This patch adds missed binding documentation for Keystone 2 66AK2HK/E/L
CPTS module.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
.../bindings/net/keystone-netcp.txt | 44 +++++++++++++++++++
1 file changed, 44 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/keystone-netcp.txt b/Documentation/devicetree/bindings/net/keystone-netcp.txt
index 6262c2f293b0..24f11e042f8d 100644
--- a/Documentation/devicetree/bindings/net/keystone-netcp.txt
+++ b/Documentation/devicetree/bindings/net/keystone-netcp.txt
@@ -104,6 +104,23 @@ Required properties:
- 10Gb mac<->mac forced mode : 11
----phy-handle: phandle to PHY device

+- cpts: sub-node time synchronization (CPTS) submodule configuration
+-- clocks: CPTS reference clock. Should point on cpts-refclk-mux clock.
+-- clock-names: should be "cpts"
+-- cpts-refclk-mux: multiplexer clock definition sub-node for CPTS reference (RFTCLK) clock
+--- #clock-cells: should be 0
+--- clocks: list of CPTS reference (RFTCLK) clock's parents as defined in Data manual
+--- ti,mux-tbl: array of multiplexer indexes as defined in Data manual
+--- assigned-clocks: should point on cpts-refclk-mux clock
+--- assigned-clock-parents: should point on required RFTCLK clock parent to be selected
+-- cpts_clock_mult: (optional) Numerator to convert input clock ticks
+ into nanoseconds
+-- cpts_clock_shift: (optional) Denominator to convert input clock ticks into
+ nanoseconds.
+ Mult and shift will be calculated basing on CPTS
+ rftclk frequency if both cpts_clock_shift and
+ cpts_clock_mult properties are not provided.
+
Optional properties:
- enable-ale: NetCP driver keeps the address learning feature in the ethernet
switch module disabled. This attribute is to enable the address
@@ -168,6 +185,23 @@ netcp: netcp@2000000 {
tx-queue = <648>;
tx-channel = <8>;

+ cpts {
+ clocks = <&cpts_refclk_mux>;
+ clock-names = "cpts";
+
+ cpts_refclk_mux: cpts-refclk-mux {
+ #clock-cells = <0>;
+ clocks = <&chipclk12>, <&chipclk13>,
+ <&timi0>, <&timi1>,
+ <&tsipclka>, <&tsrefclk>,
+ <&tsipclkb>;
+ ti,mux-tbl = <0x0>, <0x1>, <0x2>,
+ <0x3>, <0x4>, <0x8>, <0xC>;
+ assigned-clocks = <&cpts_refclk_mux>;
+ assigned-clock-parents = <&chipclk12>;
+ };
+ };
+
interfaces {
gbe0: interface-0 {
slave-port = <0>;
@@ -219,3 +253,13 @@ netcp: netcp@2000000 {
};
};
};
+
+CPTS board configuration - select external CPTS RFTCLK:
+
+&tsrefclk{
+ clock-frequency = <500000000>;
+};
+
+&cpts_refclk_mux {
+ assigned-clock-parents = <&tsrefclk>;
+};
--
2.17.1
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