linux-kernel - [PATCH v8 07/13] clk: max77686: Improve Maxim 77686 PMIC clocks binding

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Message-Id: <1405337769-3741-8-git-send-email-javier.martinez@collabora.co.uk>
Date:	Mon, 14 Jul 2014 13:36:03 +0200
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Mark Brown <broonie@...nel.org>,
	Mike Turquette <mturquette@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olof@...om.net>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Yadwinder Singh Brar <yadi.brar01@...il.com>,
	Tushar Behera <trblinux@...il.com>,
	Andreas Farber <afaerber@...e.de>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Subject: [PATCH v8 07/13] clk: max77686: Improve Maxim 77686 PMIC clocks binding

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.

Finally, add "clock-output-names" as an optional property
since now is supported by the clock driver.

Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Reviewed-by: Doug Anderson <dianders@...omium.org>
Reviewed-by: Mike Turquette <mturquette@...aro.org>
---

Changes since v6: None

Changes since v5:
 - Fix generic driver changes merged into max77802 clock patch by mistake.
   Suggested by Yadwinder Singh Brar.
 - Register clock lookups using clk_register_clkdev() instead of doing manually.
 - Use the managed devm_clk_register() function and remove clk un-registration.
 - Add "clock-output-names" property support. Suggested by Yadwinder Singh Brar.
 - Return the rate unconditionally in recalc_rate. Suggested by Mike Turquette.

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.
---
 .../devicetree/bindings/clock/maxim,max77686.txt         | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/clock/maxim,max77686.txt b/Documentation/devicetree/bindings/clock/maxim,max77686.txt
index 96ce71b..9c40739 100644
--- a/Documentation/devicetree/bindings/clock/maxim,max77686.txt
+++ b/Documentation/devicetree/bindings/clock/maxim,max77686.txt
@@ -9,13 +9,21 @@ 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.
+
+Optional properties:
+- clock-output-names: From common clock binding.
+
+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 +42,5 @@ Example: Clock consumer node
 		compatible = "bar,foo";
 		/* ... */
 		clock-names = "my-clock";
-		clocks = <&max77686 2>;
+		clocks = <&max77686 MAX77686_CLK_PMIC>;
 	};
-- 
2.0.0.rc2

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