Hi Laurent,
I have a few comments.
On Sun, Nov 10, 2013 at 03:33:40AM +0000, Laurent Pinchart wrote:
> Document the device tree bindings for the sci serial port devices.
>
> Cc: devicetree@xxxxxxxxxxxxxxx
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> Acked-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
> ---
> .../bindings/serial/renesas,sci-serial.txt | 42 ++++++++++++++++++++++
> 1 file changed, 42 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
>
> diff --git a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
> new file mode 100644
> index 0000000..66d3bca
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
> @@ -0,0 +1,42 @@
> +* Renesas SH-Mobile Serial Communication Interface
> +
> +Required properties:
> +
> + - compatible: one of the following types (scif, scifa, scifb, hscif).
Minor nit, but would be nice to have "Should contain one of the
following:". We might have future variants whereby the compatible string
will actually be a string list.
> +
> + - "renesas,scif-r8a7790" for R8A7790 (R-Car H2) SCIF compatible UART.
> + - "renesas,scifa-r8a7790" for R8A7790 (R-Car H2) SCIFA compatible UART.
> + - "renesas,scifb-r8a7790" for R8A7790 (R-Car H2) SCIFB compatible UART.
> + - "renesas,hscif-r8a7790" for R8A7790 (R-Car H2) HSCIF compatible UART.
> + - "renesas,scif-generic" for generic SCIF compatible UART.
> + - "renesas,scifa-generic" for generic SCIFA compatible UART.
> + - "renesas,scifb-generic" for generic SCIFB compatible UART.
> + - "renesas,hscif-generic" for generic HSCIF compatible UART.
Is the "-generic" suffix necessary? Why not just "renesas,scif" etc?
> +
> + When compatible with the generic version, nodes must also list the
> + SoC-specific version corresponding to the platform.
Presumably the SoC-specific version should come first; it would be nice
to note that.
> +
> + - reg: Base address and length of the memory resource used by the UART.
I assume by memory resource you mean the memory-mapped registers?
Resource sounds like Linux-internal nomenclature leaking.
> +
> + - interrupt-parent: Reference to the parent interrupt controller.
I don't think this is strictly necessary. It's implicit by default and
can be added optionally when a system is wired in a complex way. As it's
a completely standard optional property I'm not even sure it needs to be
documented.
> + - interrupts: Interrupt number.
Minor nit: "Should contain an interrupt-specifier for ..."
I saw the cover mentioned multiple interrupts. Which logical interrupt
output of the device are you expecting here?
> +
> + - clocks: Reference to the SCIx UART interface clock.
Minor nit: s/Reference to/A phandle + clock-specifier pair for/
> + - clock-names: Should be "sci_ick".
As we're using clock-names, it would be nicer still to define clocks in
terms of clock-names so as to make it easier to update the document in
future and make the expected use of clock-names clearer:
- clocks: Should contain a phandle + clock-specifier pair for each entry
in clock-names.
- clock-names: Should contain "sci_ick".
> +
> +Note: Each enabled SCIx UART should have an alias correctly numbered in the
> +"aliases" node.
> +
> +Example:
> + aliases {
> + serial0 = &scifa0;
> + };
> +
> + scifa0: serial@e6c40000 {
> + compatible = "renesas,scifa-r8a7790", "renesas,scifa-generic";
> + reg = <0 0xe6c40000 0 64>;
> + interrupt-parent = <&gic>;
> + interrupts = <0 144 4>;
> + clocks = <&mstp2_clks 4>;
> + clock-names = "sci_ick";
> + };
Otherwise this looks good to me.
Thanks,
Mark.
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