On Mon, Jul 24, 2017 at 06:05:19PM -0500, 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>
> ---
> Version 2:
> Tweak commit message working
> Tweak wording for properties
> Drop unit addressing
> Give example if CAN-FD isn't supported
>
> .../bindings/net/can/fixed-transceiver.txt | 42 ++++++++++++++++++++++
> 1 file changed, 42 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..dc7e3eb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/can/fixed-transceiver.txt
> @@ -0,0 +1,42 @@
> +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.
> +
> +Properties:
> +
> +Optional:
> + max-arbitration-speed: a positive non 0 value that determines the max
> + speed that CAN can run in non CAN-FD mode or during the
> + arbitration phase in CAN-FD mode.
Hi Franklin
Since this and the next property are optional, it is good to document
what happens when they are not in the DT blob. Also document what 0
means.
> +
> + max-data-speed: a positive non 0 value that determines the max data rate
> + that can be used in CAN-FD mode. A value of -1 implies
> + CAN-FD is not supported by the transceiver.
-1 is ugly. I think it would be better to have a missing
max-data-speed property indicate that CAN-FD is not supported. And
maybe put 'fd' into the property name.
Andrew
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
