linux-kernel - [PATCH 2/2] dt-bindings: timer: imx: gpt: Add pin group bindings for input capture

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Date:   Tue, 15 Oct 2019 18:05:44 -0700
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-kernel@...r.kernel.org (open list:CLOCKSOURCE, CLOCKEVENT DRIVERS),
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/FREESCALE IMX
        / MXC ARM ARCHITECTURE)
Cc:     Steve Longerbeam <slongerbeam@...il.com>
Subject: [PATCH 2/2] dt-bindings: timer: imx: gpt: Add pin group bindings for input capture

Add pin group bindings to support input capture function of the i.MX
GPT.

Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>
---
 .../devicetree/bindings/timer/fsl,imxgpt.txt  | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt b/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt
index 5d8fd5b52598..32797b7b0d02 100644
--- a/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt
+++ b/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt
@@ -33,6 +33,13 @@ Required properties:
            an entry for each entry in clock-names.
 - clock-names : must include "ipg" entry first, then "per" entry.
 
+Optional properties:
+
+- pinctrl-0: For the i.MX GPT to support the Input Capture function,
+  	     the input capture channel pin groups must be listed here.
+- pinctrl-names: must be "default".
+
+
 Example:
 
 gpt1: timer@...03000 {
@@ -43,3 +50,24 @@ gpt1: timer@...03000 {
 		 <&clks IMX27_CLK_PER1_GATE>;
 	clock-names = "ipg", "per";
 };
+
+
+Example with input capture channel 0 support:
+
+pinctrl_gpt_input_capture0: gptinputcapture0grp {
+	fsl,pins = <
+		MX6QDL_PAD_SD1_DAT0__GPT_CAPTURE1 0x1b0b0
+	>;
+};
+
+gpt: gpt@...8000 {
+	compatible = "fsl,imx6q-gpt", "fsl,imx31-gpt";
+	reg = <0x02098000 0x4000>;
+	interrupts = <0 55 IRQ_TYPE_LEVEL_HIGH>;
+	clocks = <&clks IMX6QDL_CLK_GPT_IPG>,
+		<&clks IMX6QDL_CLK_GPT_IPG_PER>,
+		<&clks IMX6QDL_CLK_GPT_3M>;
+	clock-names = "ipg", "per", "osc_per";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_gpt_input_capture0>;
+};
-- 
2.17.1