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authorGrygorii Strashko <grygorii.strashko@ti.com>2016-12-07 03:00:44 +0300
committerDavid S. Miller <davem@davemloft.net>2016-12-07 19:13:48 +0300
commit88f0f0b0bebfbe086dda853f591ae3a014b19e40 (patch)
tree4959691cfec4f836023a6ed9e392164946120b7d /Documentation
parent5304121adae9fc59f4b640f82200868112edd0bd (diff)
downloadlinux-88f0f0b0bebfbe086dda853f591ae3a014b19e40.tar.xz
net: ethernet: ti: cpts: calc mult and shift from refclk freq
The cyclecounter mult and shift values can be calculated based on the CPTS rfclk frequency and timekeepnig framework provides required algos and API's. Hence, calc mult and shift basing on CPTS rfclk frequency if both cpts_clock_shift and cpts_clock_mult properties are not provided in DT (the basis of calculation algorithm is borrowed from __clocksource_update_freq_scale() commit 7d2f944a2b83 ("clocksource: Provide a generic mult/shift factor calculation")). After this change cpts_clock_shift and cpts_clock_mult DT properties will become optional. Cc: John Stultz <john.stultz@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/net/cpsw.txt8
1 files changed, 5 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/net/cpsw.txt b/Documentation/devicetree/bindings/net/cpsw.txt
index 5ad439f30135..ebda7c93453a 100644
--- a/Documentation/devicetree/bindings/net/cpsw.txt
+++ b/Documentation/devicetree/bindings/net/cpsw.txt
@@ -20,8 +20,6 @@ Required properties:
- slaves : Specifies number for slaves
- active_slave : Specifies the slave to use for time stamping,
ethtool and SIOCGMIIPHY
-- cpts_clock_mult : Numerator to convert input clock ticks into nanoseconds
-- cpts_clock_shift : Denominator to convert input clock ticks into nanoseconds
Optional properties:
- ti,hwmods : Must be "cpgmac0"
@@ -35,7 +33,11 @@ Optional properties:
For example in dra72x-evm, pcf gpio has to be
driven low so that cpsw slave 0 and phy data
lines are connected via mux.
-
+- cpts_clock_mult : Numerator to convert input clock ticks into nanoseconds
+- cpts_clock_shift : 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.
Slave Properties:
Required properties: