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dt-bindings: doc: net: keystone-netcp: document cpts 

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 "legacy" 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>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Grygorii Strashko 2019-06-06 19:30:38 +03:00 committed by David S. Miller
parent 8d94a8733c
commit 12775af505
1 changed files with 44 additions and 0 deletions
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44
Documentation/devicetree/bindings/net/keystone-netcp.txt
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@ -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>;
};