Re: [PATCH v11 5/6] flexcan: Prefer device tree clock frequency if available.

If our CAN device's device tree node has a clock-frequency property,
then use that value for the can devices clock frequency.  If not, fall
back to asking the platform/mach code for the clock frequency associated
with the flexcan device.

Signed-off-by: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
To: Kumar Gala <redacted>
To: Wolfgang Grandegger <redacted>,
To: Marc Kleine-Budde <redacted>,
To: U Bhaskar-B22300 <redacted>
To: Scott Wood <redacted>
To: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Cc: PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
---
 .../devicetree/bindings/net/can/fsl-flexcan.txt    |    2 +
 drivers/net/can/flexcan.c                          |   33 +++++++++++++++-----
 2 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt b/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
index c78dcbb..a4382c7 100644
--- a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
+++ b/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt

@@ -11,6 +11,7 @@ Required properties:
 
 - reg : Offset and length of the register set for this device
 - interrupts : Interrupt tuple for this device
+- clock-frequency : The oscillator frequency driving the flexcan device
 
 Example:
 

@@ -19,4 +20,5 @@ Example:
           reg = <0x1c000 0x1000>;
           interrupts = <48 0x2>;
           interrupt-parent = <&mpic>;
+          clock-frequency = <0x0bebc1fc>;