Hi Kumar,
On Thursday 31 October 2013 10:00:36 Kumar Gala wrote:
> On Oct 31, 2013, at 9:55 AM, Laurent Pinchart wrote:
> > On Thursday 31 October 2013 09:42:48 Kumar Gala wrote:
> >> On Oct 29, 2013, at 5:29 AM, 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>
> >>> ---
> >>> .../bindings/serial/renesas,sci-serial.txt | 51 ++++++++++++++++
> >>> 1 file changed, 51 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..5658b4f
> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
> >>> @@ -0,0 +1,51 @@
> >>> +* Renesas SH-Mobile Serial Communication Interface
> >>> +
> >>> +Required properties:
> >>> +
> >>> + - compatible: should be one of the following.
> >>
> >> Being pedantic, but how about saying 'one of the following types (scif,
> >> scifa, scifb, or hscif)
> >
> > Sounds good to me.
> >
> >>> +
> >>> + - "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.
> >>> +
> >>> + When compatible with the generic version, nodes must also list the
> >>> + SoC-specific version corresponding to the platform.
> >>> +
> >>> + - reg: Base address and length of the memory resource used by the
> >>> UART.
> >>> +
> >>> + - interrupt-parent: Reference to the parent interrupt controller.
> >>> + - interrupts: Interrupt number(s). Depending on the SoC SCIx UARTs
> >>> are
> >>> tied
> >>> + to one or multiple interrupt lines. When using multiple interrupt
> >>> lines,
> >>> + specify the interrupt names as described below.
> >>> +
> >>> + - clocks: Reference to the SCIx UART interface clock.
> >>> + - clock-names: Should be "sci_ick".
> >>> +
> >>> +Optional properties:
> >>> +
> >>> + - interrupt-names: When using multiple interrupts, report the
> >>> interrupt
> >>> + names as "eri" (receive error), "rxi" (receive), "txi" (transmit)
> >>> and
> >>> + "bri" (break). When using a single interrupt this property should
> >>> not
> >>> be + present.
> >>
> >> Hmm, is there a reason not to just have the 4 interrupts always present
> >> and in the case they are all wired to the same interrupt, just have the
> >> interrupts all be the same?
> >>
> >> example:
> >>
> >> interrupts = <0 144 4>, <0 144 4>, <0 144 4>, <0 144 4>;
> >
> > The multiple interrupts case is the exception, I thought it would be
> > easier to specify a single interrupt in the general case and have a more
> > complex binding for the exceptions.
> >
> >>> +
> >>> +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";
> >>> + };
> >>
> >> might be nice to have an example with the 4 interrupts.
> >
> > The example would be pretty theoretical, as the r8a7790 uses a single
> > interrupt in all cases. What about adding such an example when adding an
> > SoC that uses multiple interrupts to the DT bindings documentation ?
>
> I'm fine with that if we strip the multiple interrupt bits out of the
> binding until a device/compatible exists that needs it.
I'll do that and repost.
--
Regards,
Laurent Pinchart
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