Re: [PATCH 01/25] serial: sh-sci: Update DT binding documentation for external clock input

[Geert Uytterhoeven <geert@linux-m68k.org>]

On Thu, Nov 19, 2015 at 9:33 PM, Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> On Thu, Nov 19, 2015 at 9:19 PM, Laurent Pinchart
> <laurent.pinchart@ideasonboard.com> wrote:
>> On Thursday 19 November 2015 19:38:40 Geert Uytterhoeven wrote:
>>> diff --git a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
>>> b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt index
>>> 2c9e6b8477e92792..8efc9b6f35637fbb 100644
>>> --- a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
>>> +++ b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
>>> @@ -43,6 +43,9 @@ Required properties:
>>>    - clocks: Must contain a phandle and clock-specifier pair for each entry
>>>      in clock-names.
>>>    - clock-names: Must contain "fck" for the SCIx UART functional clock.
>>> +    On (H)SCI(F) and some SCIFA, an additional clock may be specified:
>>
>> Could you list the SCIFA variants that support external clocks ?
>
> The list is in the commit description of "[PATCH 19/25] serial: sh-sci: Add
> support for optional external (H)SCK input": sh7723, sh7724, and r8a7740.
>
> Note that the list is probably incomplete, so I don't know if it's that useful
> to have it in the binding docs. Especially as I haven't verified yet that it
> actually works ;-)

For the record: on r8a7740, this feature is not available on SCIFA instances
2-7. The sole pins providing access to SCIFA_SCK[01] are muxed for Ethernet use
on r8a7740/armadillo. So it's unlikely I'll be able to support and test this.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds