[PATCH v2 3/3] input: mc13783: Add DT probe support

[Alexander Shiyan <shc_work@mail.ru>]

Patch adds DT support for MC13783/MC13892 PMICs.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
---
 Documentation/devicetree/bindings/mfd/mc13xxx.txt | 13 +++++
 drivers/input/misc/mc13783-pwrbutton.c            | 59 ++++++++++++++++++-----
 2 files changed, 59 insertions(+), 13 deletions(-)

diff --git a/Documentation/devicetree/bindings/mfd/mc13xxx.txt b/Documentation/devicetree/bindings/mfd/mc13xxx.txt
index abd9e3c..cf8b61c 100644
--- a/Documentation/devicetree/bindings/mfd/mc13xxx.txt
+++ b/Documentation/devicetree/bindings/mfd/mc13xxx.txt
@@ -10,6 +10,12 @@ Optional properties:
 - fsl,mc13xxx-uses-touch : Indicate the touchscreen controller is being used
 
 Sub-nodes:
+- buttons : Contain power button nodes. Each button should be declared as
+  "button@<num>" and contain code in "linux,code" property.
+  Optional properties:
+    active-high : Change active button level from 0 to 1.
+    enable-reset: Performs hadware reset through PMIC.
+    debounce    : Debounce value which will be taken from PMIC datasheet.
 - regulators : Contain the regulator nodes. The regulators are bound using
   their names as listed below with their registers and bits for enabling.
 
@@ -89,6 +95,13 @@ ecspi@70010000 { /* ECSPI1 */
 		interrupt-parent = <&gpio0>;
 		interrupts = <8>;
 
+		buttons {
+			button@1 {
+				linux,code = <0x1f>;
+				debounce = <1>;
+			};
+		};
+
 		regulators {
 			sw1_reg: mc13892__sw1 {
 				regulator-min-microvolt = <600000>;
diff --git a/drivers/input/misc/mc13783-pwrbutton.c b/drivers/input/misc/mc13783-pwrbutton.c
index 855d576..2040eb2 100644
--- a/drivers/input/misc/mc13783-pwrbutton.c
+++ b/drivers/input/misc/mc13783-pwrbutton.c
@@ -24,6 +24,7 @@
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/input.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/mc13783.h>
 #include <linux/mfd/mc13892.h>
@@ -121,21 +122,28 @@ static int __init mc13xxx_pwrbutton_probe(struct platform_device *pdev)
 	struct mc13xxx *mc13xxx = dev_get_drvdata(pdev->dev.parent);
 	struct mc13xxx_pwrb_devtype *devtype =
 		(struct mc13xxx_pwrb_devtype *)pdev->id_entry->driver_data;
+	struct device_node *parent, *child;
 	struct mc13xxx_pwrb *priv;
 	int i, reg = 0, ret = -EINVAL;
 
-	if (!pdata) {
+	of_node_get(pdev->dev.parent->of_node);
+	parent = of_find_node_by_name(pdev->dev.parent->of_node, "buttons");
+	if (!pdata && !parent) {
 		dev_err(&pdev->dev, "Missing platform data\n");
 		return -ENODEV;
 	}
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
+	if (!priv) {
+		ret = -ENOMEM;
+		goto out_node_put;
+	}
 
 	priv->input = devm_input_allocate_device(&pdev->dev);
-	if (!priv->input)
-		return -ENOMEM;
+	if (!priv->input) {
+		ret = -ENOMEM;
+		goto out_node_put;
+	}
 
 	priv->mc13xxx = mc13xxx;
 	priv->devtype = devtype;
@@ -143,15 +151,36 @@ static int __init mc13xxx_pwrbutton_probe(struct platform_device *pdev)
 
 	for (i = 0; i < MAX13XXX_NUM_BUTTONS; i++) {
 		u16 code, invert, reset, debounce;
+		const __be32 *prop;
+		char childname[5];
 
-		if (!(pdata->buttons[i].flags & MC13XXX_BUTTON_ENABLE))
-			continue;
-		code = pdata->buttons[i].keycode;
-		invert = !!(pdata->buttons[i].flags &
-			    MC13XXX_BUTTON_POL_INVERT);
-		reset = !!(pdata->buttons[i].flags &
-			   MC13XXX_BUTTON_RESET_EN);
-		debounce = pdata->buttons[i].flags;
+		if (parent) {
+			sprintf(childname, "button@%i", i + 1);
+			child = of_get_child_by_name(parent, childname);
+			if (!child)
+				continue;
+			prop = of_get_property(child, "linux,code", NULL);
+			if (prop)
+				code = be32_to_cpu(*prop) & 0xffff;
+			else {
+				dev_err(&pdev->dev,
+					"Button %i: Missing key code\n", i + 1);
+				continue;
+			}
+			invert = of_property_read_bool(child, "active-high");
+			reset = of_property_read_bool(child, "enable-reset");
+			prop = of_get_property(child, "debounce", NULL);
+			debounce = prop ? be32_to_cpu(*prop) : 0;
+		} else {
+			if (!(pdata->buttons[i].flags & MC13XXX_BUTTON_ENABLE))
+				continue;
+			code = pdata->buttons[i].keycode;
+			invert = !!(pdata->buttons[i].flags &
+				    MC13XXX_BUTTON_POL_INVERT);
+			reset = !!(pdata->buttons[i].flags &
+				   MC13XXX_BUTTON_RESET_EN);
+			debounce = pdata->buttons[i].flags;
+		}
 
 		priv->btn_code[i] = code;
 		if (code != KEY_RESERVED)
@@ -186,6 +215,10 @@ static int __init mc13xxx_pwrbutton_probe(struct platform_device *pdev)
 	if (ret)
 		dev_err(&pdev->dev, "Can't register input device: %i\n", ret);
 
+out_node_put:
+	if (parent)
+		of_node_put(parent);
+
 	return ret;
 }
 
-- 
1.8.1.5