[RFC PATCH 3/3] OMAP: omap_device: Add a method to build an omap_device from a DT node

[Benoit Cousson]

Add a notifier called during device_add phase. If a of_node is present,
retrieve the hwmod entry in order to populate propely the omap_device
structure.
For the moment the resource from the device-tree are overloaded.
DT does not support named resource yet, and thus, most driver
will not work without that information.

Signed-off-by: Benoit Cousson <b-cousson at ti.com>
Cc: Kevin Hilman <khilman at ti.com>
---
 arch/arm/plat-omap/omap_device.c |  102 ++++++++++++++++++++++++++++++++++++++
 1 files changed, 102 insertions(+), 0 deletions(-)

diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
index 70361f8..0ae9e7f 100644
--- a/arch/arm/plat-omap/omap_device.c
+++ b/arch/arm/plat-omap/omap_device.c
@@ -85,6 +85,8 @@
 #include <linux/clk.h>
 #include <linux/clkdev.h>
 #include <linux/pm_runtime.h>
+#include <linux/of_platform.h>
+#include <linux/notifier.h>
 
 #include <plat/omap_device.h>
 #include <plat/omap_hwmod.h>
@@ -94,6 +96,8 @@
 #define USE_WAKEUP_LAT			0
 #define IGNORE_WAKEUP_LAT		1
 
+#define MAX_HWMOD_NAME_SIZE		32
+
 static int omap_device_register(struct platform_device *pdev);
 static int omap_early_device_register(struct platform_device *pdev);
 static struct omap_device *omap_device_alloc(struct platform_device *pdev,
@@ -354,6 +358,100 @@ static int _dt_get_property(const char *prop, int len, int index, char *output,
 	return -ENODEV;
 }
 
+static struct dev_pm_domain omap_device_pm_domain;
+
+/**
+ * omap_device_build_from_dt - build an omap_device with multiple hwmods
+ * @pdev_name: name of the platform_device driver to use
+ * @pdev_id: this platform_device's connection ID
+ * @oh: ptr to the single omap_hwmod that backs this omap_device
+ * @pdata: platform_data ptr to associate with the platform_device
+ * @pdata_len: amount of memory pointed to by @pdata
+ * @pm_lats: pointer to a omap_device_pm_latency array for this device
+ * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
+ * @is_early_device: should the device be registered as an early device or not
+ *
+ * Function for building an omap_device already registered from device-tree
+ *
+ * Returns 0 or PTR_ERR() on error.
+ */
+static int omap_device_build_from_dt(struct platform_device *pdev)
+{
+	struct omap_hwmod **hwmods;
+	struct omap_device *od;
+	struct omap_hwmod *oh;
+	char oh_name[MAX_HWMOD_NAME_SIZE];
+	const char *prop;
+	int oh_cnt, i, prop_len;
+	int ret = 0;
+
+	prop = of_get_property(pdev->dev.of_node, "hwmods", &prop_len);
+	oh_cnt = _dt_count_property_string(prop, prop_len);
+	if (!oh_cnt || IS_ERR_VALUE(oh_cnt)) {
+		dev_warn(&pdev->dev, "No 'hwmods' to build omap_device\n");
+		return -ENODEV;
+	}
+
+	hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
+	if (!hwmods) {
+		ret = -ENOMEM;
+		goto odbfd_exit;
+	}
+
+	for (i = 0; i < oh_cnt; i++) {
+		_dt_get_property(prop, prop_len, i, oh_name,
+				 MAX_HWMOD_NAME_SIZE);
+
+		oh = omap_hwmod_lookup(oh_name);
+		if (!oh) {
+			dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
+				oh_name);
+			ret = -EINVAL;
+			goto odbfd_exit1;
+		}
+		hwmods[i] = oh;
+	}
+
+	od = omap_device_alloc(pdev, hwmods, oh_cnt, NULL, 0);
+	if (!od) {
+		dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
+			oh_name);
+		ret = PTR_ERR(od);
+		goto odbfd_exit1;
+	}
+
+	if (of_get_property(pdev->dev.of_node, "no_idle_on_suspend", NULL))
+		omap_device_disable_idle_on_suspend(pdev);
+
+	pdev->dev.pm_domain = &omap_device_pm_domain;
+
+odbfd_exit1:
+	kfree(hwmods);
+odbfd_exit:
+	return ret;
+}
+
+static int _omap_device_notifier_call(struct notifier_block *nb,
+				      unsigned long event, void *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	switch (event) {
+	case BUS_NOTIFY_ADD_DEVICE:
+		if (pdev->dev.of_node) {
+			dev_dbg(&pdev->dev, "add_device with DT bindings\n");
+			omap_device_build_from_dt(pdev);
+		}
+		break;
+
+	case BUS_NOTIFY_DEL_DEVICE:
+		dev_dbg(&pdev->dev, "del_device\n");
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
 
 /* Public functions for use by core code */
 
@@ -1064,8 +1162,12 @@ struct device omap_device_parent = {
 	.parent         = &platform_bus,
 };
 
+static struct notifier_block platform_nb;
+
 static int __init omap_device_init(void)
 {
+	platform_nb.notifier_call = _omap_device_notifier_call;
+	bus_register_notifier(&platform_bus_type, &platform_nb);
 	return device_register(&omap_device_parent);
 }
 core_initcall(omap_device_init);
-- 
1.7.0.4