cpsw: add a DT field for the active time stamping port

Because time stamping on both external ports of the switch simultaneously
is positively useless from the application's point of view, this patch
provides a DT configuration method to choose the active port.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/net/cpsw.txt b/Documentation/devicetree/bindings/net/cpsw.txt
index dba014fc5e7b..9f61f2b51681 100644
--- a/Documentation/devicetree/bindings/net/cpsw.txt
+++ b/Documentation/devicetree/bindings/net/cpsw.txt
@@ -23,6 +23,7 @@ Required properties:
 - mac_control           : Specifies Default MAC control register content
                           for the specific platform
 - slaves                : Specifies number for slaves
+- cpts_active_slave     : Specifies the slave to use for time stamping
 - slave_reg_ofs         : Specifies slave register offset
 - sliver_reg_ofs        : Specifies slave sliver register offset
 - phy_id                : Specifies slave phy id
@@ -60,6 +61,7 @@ Examples:
                 rx_descs = <64>;
                 mac_control = <0x20>;
                 slaves = <2>;
+                cpts_active_slave = <0>;
                 cpsw_emac0: slave@0 {
                         slave_reg_ofs = <0x200>;
                         sliver_reg_ofs = <0xd80>;
@@ -95,6 +97,7 @@ Examples:
                 rx_descs = <64>;
                 mac_control = <0x20>;
                 slaves = <2>;
+                cpts_active_slave = <0>;
                 cpsw_emac0: slave@0 {
                         slave_reg_ofs = <0x200>;
                         sliver_reg_ofs = <0xd80>;