Thread (42 messages) flat view 42 messages, 8 authors, 2014-07-02

Re: [PATCH v5 04/14] clk: max77686: Improve Maxim 77686 PMIC clocks binding

From: Mike Turquette <hidden>
Date: 2014-07-01 17:30:15
Also in: linux-arm-kernel, linux-samsung-soc, lkml

Quoting Javier Martinez Canillas (2014-06-26 11:15:36)
Like most clock drivers, the Maxim 77686 PMIC clock binding
follows the convention that the "#clock-cells" property is
used to specify the number of cells in a clock provider.

But the binding document is not clear enough that it shall
be set to 1 since the PMIC support multiple clocks outputs.

Also, explain that the clocks identifiers are defined in a
header file that can be included by Device Tree source with
client nodes to avoid using magic numbers.

Signed-off-by: Javier Martinez Canillas <javier.martinez-ZGY8ohtN/8pPYcu2f3hruQ@public.gmane.org>
Reviewed-by: Krzysztof Kozlowski <redacted>
Reviewed-by: Doug Anderson <redacted>
Looks good to me.

Regards,
Mike
quoted hunk ↗ jump to hunk
---

Changes since v4: None

Changes since v3:
 - Don't change clock-names property to make clear that it's
   the consumer clock name and should not match the producer clock.
   Suggested by Doug Anderson.

 Documentation/devicetree/bindings/clock/maxim,max77686.txt | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/clock/maxim,max77686.txt b/Documentation/devicetree/bindings/clock/maxim,max77686.txt
index 96ce71b..48e00bb 100644
--- a/Documentation/devicetree/bindings/clock/maxim,max77686.txt
+++ b/Documentation/devicetree/bindings/clock/maxim,max77686.txt
@@ -9,13 +9,18 @@ The MAX77686 contains three 32.768khz clock outputs that can be controlled
 Following properties should be presend in main device node of the MFD chip.
 
 Required properties:
-- #clock-cells: simple one-cell clock specifier format is used, where the
-  only cell is used as an index of the clock inside the provider. Following
-  indices are allowed:
+
+- #clock-cells: from common clock binding; shall be set to 1.
+
+Each clock is assigned an identifier and client nodes can use this identifier
+to specify the clock which they consume. Following indices are allowed:
     - 0: 32khz_ap clock,
     - 1: 32khz_cp clock,
     - 2: 32khz_pmic clock.
 
+Clocks are defined as preprocessor macros in dt-bindings/clock/maxim,max77686.h
+header and can be used in device tree sources.
+
 Example: Node of the MFD chip
 
        max77686: max77686@09 {
@@ -34,5 +39,5 @@ Example: Clock consumer node
                compatible = "bar,foo";
                /* ... */
                clock-names = "my-clock";
-               clocks = <&max77686 2>;
+               clocks = <&max77686 MAX77686_CLK_PMIC>;
        };
-- 
2.0.0.rc2
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help