[1/3] ARM: pmu: add OF probing support

Commit Message

Rob Herring June 1, 2011, 4:37 p.m. UTC

From: Rob Herring <[e-mail]>

Add OF match table to enable OF style driver binding. The dts entry is like
this:

pmu {
	compatible = "arm,cortex-a9-pmu";
	interrupts = <100 101>;
};

The use of pdev->id as an index breaks with OF device binding, so set the type
based on the OF compatible string.

Signed-off-by: Rob Herring <[e-mail]>
---
 arch/arm/kernel/pmu.c |   23 ++++++++++++++++++-----
 1 files changed, 18 insertions(+), 5 deletions(-)

Comments

Olof Johansson June 1, 2011, 6:37 p.m. UTC | #1

On Wed, Jun 1, 2011 at 9:37 AM, Rob Herring <[e-mail]> wrote:
> From: Rob Herring <[e-mail]>
>
> Add OF match table to enable OF style driver binding. The dts entry is like
> this:
>
> pmu {
>        compatible = "arm,cortex-a9-pmu";
>        interrupts = <100 101>;
> };
>
> The use of pdev->id as an index breaks with OF device binding, so set the type
> based on the OF compatible string.

Even though they're simple, new bindings like these need to be
documented. Current location for that is
Documentation/devicetree/bindings/.

Can you start an ARM directory there and add corresponding docs for the this?


Thanks!

-Olof

Patch

diff --git a/arch/arm/kernel/pmu.c b/arch/arm/kernel/pmu.c
index 2c79eec..41bc972 100644
--- a/arch/arm/kernel/pmu.c
+++ b/arch/arm/kernel/pmu.c
@@ -27,27 +27,40 @@  static struct platform_device *pmu_devices[ARM_NUM_PMU_DEVICES];
 
 static int __devinit pmu_device_probe(struct platform_device *pdev)
 {
+	enum arm_pmu_type type = pdev->id;
 
-	if (pdev->id < 0 || pdev->id >= ARM_NUM_PMU_DEVICES) {
+	if (pdev->dev.of_node)
+		type = ARM_PMU_DEVICE_CPU;
+
+	if (type < 0 || type >= ARM_NUM_PMU_DEVICES) {
 		pr_warning("received registration request for unknown "
 				"device %d\n", pdev->id);
 		return -EINVAL;
 	}
 
-	if (pmu_devices[pdev->id])
+	if (pmu_devices[type])
 		pr_warning("registering new PMU device type %d overwrites "
-				"previous registration!\n", pdev->id);
+				"previous registration!\n", type);
 	else
 		pr_info("registered new PMU device of type %d\n",
-				pdev->id);
+				type);
 
-	pmu_devices[pdev->id] = pdev;
+	pmu_devices[type] = pdev;
 	return 0;
 }
 
+static struct of_device_id pmu_device_ids[] = {
+	{ .compatible = "arm,cortex-a9-pmu" },
+	{ .compatible = "arm,cortex-a8-pmu" },
+	{ .compatible = "arm,arm1136-pmu" },
+	{ .compatible = "arm,arm1176-pmu" },
+	{},
+};
+
 static struct platform_driver pmu_driver = {
 	.driver		= {
 		.name	= "arm-pmu",
+		.of_match_table = pmu_device_ids,
 	},
 	.probe		= pmu_device_probe,
 };