The clock output is generally only used for testing and development and
not used to daisy-chain PHYs. It's just a source of RF noise afterward.
Add a mux value for "off". I've added it as another enumeration to the
output property. In the actual PHY, the mux and the output enable are
independently controllable. However, it doesn't seem useful to be able
to describe the mux setting when the output is disabled.
Document that PHY's default setting will be left as is if the property
is omitted.
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Signed-off-by: Trent Piepho <tpiepho@xxxxxxxxxx>
---
Documentation/devicetree/bindings/net/ti,dp83867.txt | 6 ++++--
include/dt-bindings/net/ti-dp83867.h | 2 ++
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/net/ti,dp83867.txt b/Documentation/devicetree/bindings/net/ti,dp83867.txt
index e97f54aeac77..95ecdc335e63 100644
--- a/Documentation/devicetree/bindings/net/ti,dp83867.txt
+++ b/Documentation/devicetree/bindings/net/ti,dp83867.txt
@@ -31,8 +31,10 @@ Optional property:
software needs to take when this pin is
strapped in these modes. See data manual
for details.
- - ti,clk-output-sel - Muxing option for CLK_OUT pin - see dt-bindings/net/ti-dp83867.h
- for applicable values.
+ - ti,clk-output-sel - Muxing option for CLK_OUT pin. See dt-bindings/net/ti-dp83867.h
+ for applicable values. The CLK_OUT pin can also
+ be disabled by this property. When omitted, the
+ PHY's default will be left as is.
Note: ti,min-output-impedance and ti,max-output-impedance are mutually
exclusive. When both properties are present ti,max-output-impedance
diff --git a/include/dt-bindings/net/ti-dp83867.h b/include/dt-bindings/net/ti-dp83867.h
index 7b1656427cbe..192b79439eb7 100644
--- a/include/dt-bindings/net/ti-dp83867.h
+++ b/include/dt-bindings/net/ti-dp83867.h
@@ -56,4 +56,6 @@
#define DP83867_CLK_O_SEL_CHN_C_TCLK 0xA
#define DP83867_CLK_O_SEL_CHN_D_TCLK 0xB
#define DP83867_CLK_O_SEL_REF_CLK 0xC
+/* Special flag to indicate clock should be off */
+#define DP83867_CLK_O_SEL_OFF 0xFFFFFFFF
#endif
--
2.14.5
