diff mbox

[v3,03/27] serial: sh-sci: Update DT binding documentation for external clock input

Message ID 1450119456-964-4-git-send-email-geert+renesas@glider.be (mailing list archive)
State Accepted
Delegated to: Geert Uytterhoeven
Headers show

Commit Message

Geert Uytterhoeven Dec. 14, 2015, 6:57 p.m. UTC 
Amend the DT bindings to include the optional external clock on
(H)SCI(F) and some SCIFA, where this pin can serve as a clock input,
depending on board wiring.

Clarify the use of the divided functional clock as a source for the
sampling clock.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: devicetree@vger.kernel.org
---
v3:
  - Add Acked-by,
  - Clarify the use of the divided functional clock.
---
 Documentation/devicetree/bindings/serial/renesas,sci-serial.txt | 5 +++++
 1 file changed, 5 insertions(+)

Comments

Rob Herring (Arm) Dec. 20, 2015, 3:39 a.m. UTC | #1 
On Mon, Dec 14, 2015 at 07:57:12PM +0100, Geert Uytterhoeven wrote:
> Amend the DT bindings to include the optional external clock on
> (H)SCI(F) and some SCIFA, where this pin can serve as a clock input,
> depending on board wiring.
> 
> Clarify the use of the divided functional clock as a source for the
> sampling clock.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: devicetree@vger.kernel.org
> ---
> v3:
>   - Add Acked-by,
>   - Clarify the use of the divided functional clock.
> ---
>  Documentation/devicetree/bindings/serial/renesas,sci-serial.txt | 5 +++++
>  1 file changed, 5 insertions(+)

Acked-by: Rob Herring <robh@kernel.org>
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diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
index 7091213f02513cda..31cc0631ef7ca22d 100644
--- a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
+++ b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
@@ -51,6 +51,11 @@  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.
+    Apart from the divided functional clock, there may be other possible
+    sources for the sampling clock, depending on SCIx variant.
+    On (H)SCI(F) and some SCIFA, an additional clock may be specified:
+      - "hsck" for the optional external clock input (on HSCIF),
+      - "sck" for the optional external clock input (on other variants).
 
 Note: Each enabled SCIx UART should have an alias correctly numbered in the
 "aliases" node.