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[v2,03/10] Documentation: dt: improve Maxim 77686 PMIC clocks binding

Message ID 1402941758-11216-4-git-send-email-javier.martinez@collabora.co.uk
State Superseded
Headers show

Commit Message

Javier Martinez Canillas June 16, 2014, 6:02 p.m. UTC
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@collabora.co.uk>
---
 .../devicetree/bindings/clock/maxim,max77686.txt          | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)
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Patch

diff --git a/Documentation/devicetree/bindings/clock/maxim,max77686.txt b/Documentation/devicetree/bindings/clock/maxim,max77686.txt
index 96ce71b..8dea305 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 {
@@ -33,6 +38,6 @@  Example: Clock consumer node
 	foo@0 {
 		compatible = "bar,foo";
 		/* ... */
-		clock-names = "my-clock";
-		clocks = <&max77686 2>;
+		clock-names = "32khz_pmic";
+		clocks = <&max77686 MAX77686_CLK_PMIC>;
 	};