From d8a8b3edfd922e3886684a3434bd2b752167ff29 Mon Sep 17 00:00:00 2001
From: Andrew Duggan <aduggan@synaptics.com>
Date: Thu, 10 Mar 2016 15:46:32 -0800
Subject: Input: synaptics-rmi4 - add device tree support for RMI4 I2C devices

Add devicetree binding for I2C devices and add bindings for optional
parameters in the function drivers. Parameters for function drivers are
defined in child nodes for each of the functions.

Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Acked-by: Rob Herring <robh@kernel.org>
Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/rmi4/rmi_driver.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'drivers/input/rmi4/rmi_driver.c')

diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
index b0f34b57a126..da38f0ad80ed 100644
--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c
@@ -20,6 +20,7 @@
 #include <linux/kconfig.h>
 #include <linux/pm.h>
 #include <linux/slab.h>
+#include <linux/of.h>
 #include <uapi/linux/input.h>
 #include <linux/rmi.h>
 #include "rmi_bus.h"
@@ -821,6 +822,27 @@ static int rmi_driver_remove(struct device *dev)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static int rmi_driver_of_probe(struct device *dev,
+				struct rmi_device_platform_data *pdata)
+{
+	int retval;
+
+	retval = rmi_of_property_read_u32(dev, &pdata->reset_delay_ms,
+					"syna,reset-delay-ms", 1);
+	if (retval)
+		return retval;
+
+	return 0;
+}
+#else
+static inline int rmi_driver_of_probe(struct device *dev,
+					struct rmi_device_platform_data *pdata)
+{
+	return -ENODEV;
+}
+#endif
+
 static int rmi_driver_probe(struct device *dev)
 {
 	struct rmi_driver *rmi_driver;
@@ -846,6 +868,12 @@ static int rmi_driver_probe(struct device *dev)
 
 	pdata = rmi_get_platform_data(rmi_dev);
 
+	if (rmi_dev->xport->dev->of_node) {
+		retval = rmi_driver_of_probe(rmi_dev->xport->dev, pdata);
+		if (retval)
+			return retval;
+	}
+
 	data = devm_kzalloc(dev, sizeof(struct rmi_driver_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
-- 
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