Re: [PATCH v3 2/4] dt-bindings: can: fixed-transceiver: Add new CAN fixed transceiver bindings

From: Sergei Shtylyov
Date: Thu Aug 03 2017 - 05:19:02 EST


On 8/3/2017 3:51 AM, Franklin S Cooper Jr wrote:

Add documentation to describe usage of the new fixed transceiver binding.
This new binding is applicable for any CAN device therefore it exists as
its own document.

Signed-off-by: Franklin S Cooper Jr <fcooper@xxxxxx>
.../bindings/net/can/fixed-transceiver.txt | 24 ++++++++++++++++++++++
1 file changed, 24 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/can/fixed-transceiver.txt

diff --git a/Documentation/devicetree/bindings/net/can/fixed-transceiver.txt b/Documentation/devicetree/bindings/net/can/fixed-transceiver.txt
new file mode 100644
index 0000000..2f58838b
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/can/fixed-transceiver.txt
@@ -0,0 +1,24 @@
+Fixed transceiver Device Tree binding
+CAN transceiver typically limits the max speed in standard CAN and CAN FD
+modes. Typically these limitations are static and the transceivers themselves
+provide no way to detect this limitation at runtime. For this situation,
+the "fixed-transceiver" node can be used.
+Required Properties:
+ max-bitrate: a positive non 0 value that determines the max
+ speed that CAN/CAN-FD can run. Any other value
+ will be ignored.
+Based on Texas Instrument's TCAN1042HGV CAN Transceiver
+m_can0 {
+ ....
+ fixed-transceiver@0 {

The <unit-address> (after @) must only be specified if there's "reg" prop in the device node. Also, please name the node "can-transceiver@" to be more in line with the DT spec. which requires generic node names.


MBR, Sergei