linux-kernel - [PATCH v2] pwm: imx-pwm: add explicit compatible strings and required clock properties

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Date:	Mon,  9 Mar 2015 09:24:21 -0400
From:	Matt Porter <mporter@...sulko.com>
To:	Devicetree List <devicetree@...r.kernel.org>,
	Thierry Reding <thierry.reding@...il.com>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	Linux PWM List <linux-pwm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] pwm: imx-pwm: add explicit compatible strings and required clock properties

The imx-pwm binding contains language indicating compatible
strings to be used that is not valid for all supported parts
e.g. Should be "fsl,<soc>-pwm". Fix this by enumerating the
valid compatible strings that represent the two versions of
this peripheral in use.

The binding is also missing the clocks/clock-names properties
so document these,the two required ipg and per clocks, and add
add these properties to the example.

Signed-off-by: Matt Porter <mporter@...sulko.com>
---
Changes since v1:
- compatible strings include the actual soc and one of the two specific
  compatible parts.

 Documentation/devicetree/bindings/pwm/imx-pwm.txt | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/pwm/imx-pwm.txt b/Documentation/devicetree/bindings/pwm/imx-pwm.txt
index b50d7a6d..e00c2e9 100644
--- a/Documentation/devicetree/bindings/pwm/imx-pwm.txt
+++ b/Documentation/devicetree/bindings/pwm/imx-pwm.txt
@@ -1,10 +1,17 @@
 Freescale i.MX PWM controller
 
 Required properties:
-- compatible: should be "fsl,<soc>-pwm"
+- compatible : should be "fsl,<soc>-pwm" and one of the following
+   compatible strings:
+  - "fsl,imx1-pwm" for PWM compatible with the one integrated on i.MX1
+  - "fsl,imx27-pwm" for PWM compatible with the one integrated on i.MX27
 - reg: physical base address and length of the controller's registers
 - #pwm-cells: should be 2. See pwm.txt in this directory for a description of
   the cells format.
+- clocks : Clock specifiers for both ipg and per clocks.
+- clock-names : Clock names should include both "ipg" and "per"
+See the clock consumer binding,
+	Documentation/devicetree/bindings/clock/clock-bindings.txt
 - interrupts: The interrupt for the pwm controller
 
 Example:
@@ -13,5 +20,8 @@ pwm1: pwm@...b4000 {
 	#pwm-cells = <2>;
 	compatible = "fsl,imx53-pwm", "fsl,imx27-pwm";
 	reg = <0x53fb4000 0x4000>;
+	clocks = <&clks IMX5_CLK_PWM1_IPG_GATE>,
+		 <&clks IMX5_CLK_PWM1_HF_GATE>;
+	clock-names = "ipg", "per";
 	interrupts = <61>;
 };
-- 
1.8.4

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