Input: twl6040-vibra - update for device tree support

The twl6040 DT support implementation has been changed from the
originally planned.  None of the child devices going to have
compatible_of property which means that the child devices of twl6040
will be created as traditional MFD devices.  The mfd core driver will
decide (based on the DT blob) to create a device for the twl6040-vibra
or not. If the DT blob has 'vibra' section the device will be created
without pdata.  In this case the vibra driver will reach up to the
parent node to get the needed properties.

With DT booted kernel we no longer be able to link the regulators to
the vibra driver, they can be only linked to the MFD device (probed
via DT). From the vibra driver we ned to use pdev->dev.parent to get
the regulators.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

Documentation/devicetree/bindings/input/twl6040-vibra.txt

-Vibra driver for the twl6040 family
-
-The vibra driver is a child of the twl6040 MFD dirver.
-Documentation/devicetree/bindings/mfd/twl6040.txt
-
-Required properties:
-- compatible : Must be "ti,twl6040-vibra";
-- interrupts: 4, Vibra overcurrent interrupt
-- vddvibl-supply: Regulator supplying the left vibra motor
-- vddvibr-supply: Regulator supplying the right vibra motor
-- vibldrv_res: Board specific left driver resistance
-- vibrdrv_res: Board specific right driver resistance
-- viblmotor_res: Board specific left motor resistance
-- vibrmotor_res: Board specific right motor resistance
-
-Optional properties:
-- vddvibl_uV: If the vddvibl default voltage need to be changed
-- vddvibr_uV: If the vddvibr default voltage need to be changed
-
-Example:
-/*
- * 8-channel high quality low-power audio codec
- * http://www.ti.com/lit/ds/symlink/twl6040.pdf
- */
-twl6040: twl6040@4b {
-	...
-	twl6040_vibra: twl6040@1 {
-		compatible = "ti,twl6040-vibra";
-		interrupts = <4>;
-		vddvibl-supply = <&vbat>;
-		vddvibr-supply = <&vbat>;
-		vibldrv_res = <8>;
-		vibrdrv_res = <3>;
-		viblmotor_res = <10>;
-		vibrmotor_res = <10>;
-	};
-};

drivers/input/misc/twl6040-vibra.c

@@ -251,7 +251,6 @@ static int twl6040_vibra_suspend(struct device *dev)
 
 	return 0;
 }
-
 #endif
 
 static SIMPLE_DEV_PM_OPS(twl6040_vibra_pm_ops, twl6040_vibra_suspend, NULL);
@@ -259,13 +258,19 @@ static SIMPLE_DEV_PM_OPS(twl6040_vibra_pm_ops, twl6040_vibra_suspend, NULL);
 static int __devinit twl6040_vibra_probe(struct platform_device *pdev)
 {
 	struct twl6040_vibra_data *pdata = pdev->dev.platform_data;
-	struct device_node *node = pdev->dev.of_node;
+	struct device *twl6040_core_dev = pdev->dev.parent;
+	struct device_node *twl6040_core_node = NULL;
 	struct vibra_info *info;
 	int vddvibl_uV = 0;
 	int vddvibr_uV = 0;
 	int ret;
 
-	if (!pdata && !node) {
+#ifdef CONFIG_OF
+	twl6040_core_node = of_find_node_by_name(twl6040_core_dev->of_node,
+						 "vibra");
+#endif
+
+	if (!pdata && !twl6040_core_node) {
 		dev_err(&pdev->dev, "platform_data not available\n");
 		return -EINVAL;
 	}
@@ -287,14 +292,18 @@ static int __devinit twl6040_vibra_probe(struct platform_device *pdev)
 		vddvibl_uV = pdata->vddvibl_uV;
 		vddvibr_uV = pdata->vddvibr_uV;
 	} else {
-		of_property_read_u32(node, "vibldrv_res", &info->vibldrv_res);
-		of_property_read_u32(node, "vibrdrv_res", &info->vibrdrv_res);
-		of_property_read_u32(node, "viblmotor_res",
+		of_property_read_u32(twl6040_core_node, "ti,vibldrv-res",
+				     &info->vibldrv_res);
+		of_property_read_u32(twl6040_core_node, "ti,vibrdrv-res",
+				     &info->vibrdrv_res);
+		of_property_read_u32(twl6040_core_node, "ti,viblmotor-res",
 				     &info->viblmotor_res);
-		of_property_read_u32(node, "vibrmotor_res",
+		of_property_read_u32(twl6040_core_node, "ti,vibrmotor-res",
 				     &info->vibrmotor_res);
-		of_property_read_u32(node, "vddvibl_uV", &vddvibl_uV);
-		of_property_read_u32(node, "vddvibr_uV", &vddvibr_uV);
+		of_property_read_u32(twl6040_core_node, "ti,vddvibl-uV",
+				     &vddvibl_uV);
+		of_property_read_u32(twl6040_core_node, "ti,vddvibr-uV",
+				     &vddvibr_uV);
 	}
 
 	if ((!info->vibldrv_res && !info->viblmotor_res) ||
@@ -351,8 +360,12 @@ static int __devinit twl6040_vibra_probe(struct platform_device *pdev)
 
 	info->supplies[0].supply = "vddvibl";
 	info->supplies[1].supply = "vddvibr";
-	ret = regulator_bulk_get(info->dev, ARRAY_SIZE(info->supplies),
-				 info->supplies);
+	/*
+	 * When booted with Device tree the regulators are attached to the
+	 * parent device (twl6040 MFD core)
+	 */
+	ret = regulator_bulk_get(pdata ? info->dev : twl6040_core_dev,
+				 ARRAY_SIZE(info->supplies), info->supplies);
 	if (ret) {
 		dev_err(info->dev, "couldn't get regulators %d\n", ret);
 		goto err_regulator;
@@ -418,12 +431,6 @@ static int __devexit twl6040_vibra_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct of_device_id twl6040_vibra_of_match[] = {
-	{.compatible = "ti,twl6040-vibra", },
-	{ },
-};
-MODULE_DEVICE_TABLE(of, twl6040_vibra_of_match);
-
 static struct platform_driver twl6040_vibra_driver = {
 	.probe		= twl6040_vibra_probe,
 	.remove		= __devexit_p(twl6040_vibra_remove),
@@ -431,7 +438,6 @@ static struct platform_driver twl6040_vibra_driver = {
 		.name	= "twl6040-vibra",
 		.owner	= THIS_MODULE,
 		.pm	= &twl6040_vibra_pm_ops,
-		.of_match_table = twl6040_vibra_of_match,
 	},
 };
 module_platform_driver(twl6040_vibra_driver);