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Commit b149a30d authored by Alexander Clouter's avatar Alexander Clouter Committed by Herbert Xu
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hwrng: timeriomem - added devicetree hooks



This patch allows timeriomem_rng to be used via devicetree.

Signed-off-by: default avatarAlexander Clouter <alex@digriz.org.uk>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 1907da78
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+18 −0
Original line number Diff line number Diff line
HWRNG support for the timeriomem_rng driver

Required properties:
- compatible : "timeriomem_rng"
- reg : base address to sample from
- period : wait time in microseconds to use between samples

N.B. currently 'reg' must be four bytes wide and aligned

Example:

hwrng@44 {
	#address-cells = <1>;
	#size-cells = <1>;
	compatible = "timeriomem_rng";
	reg = <0x44 0x04>;
	period = <1000000>;
};
+22 −2
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/hw_random.h>
#include <linux/io.h>
#include <linux/slab.h>
@@ -101,7 +102,7 @@ static int timeriomem_rng_probe(struct platform_device *pdev)
	int err = 0;
	int period;

	if (!pdata) {
	if (!pdev->dev.of_node && !pdata) {
		dev_err(&pdev->dev, "timeriomem_rng_data is missing\n");
		return -EINVAL;
	}
@@ -125,6 +126,18 @@ static int timeriomem_rng_probe(struct platform_device *pdev)

	platform_set_drvdata(pdev, priv);

	if (pdev->dev.of_node) {
		int i;

		if (!of_property_read_u32(pdev->dev.of_node,
						"period", &i))
			period = i;
		else {
			dev_err(&pdev->dev, "missing period\n");
			err = -EINVAL;
			goto out_free;
		}
	} else
		period = pdata->period;

	priv->period = usecs_to_jiffies(period);
@@ -202,10 +215,17 @@ static int timeriomem_rng_remove(struct platform_device *pdev)
	return 0;
}

static const struct of_device_id timeriomem_rng_match[] = {
	{ .compatible = "timeriomem_rng" },
	{},
};
MODULE_DEVICE_TABLE(of, timeriomem_rng_match);

static struct platform_driver timeriomem_rng_driver = {
	.driver = {
		.name		= "timeriomem_rng",
		.owner		= THIS_MODULE,
		.of_match_table	= timeriomem_rng_match,
	},
	.probe		= timeriomem_rng_probe,
	.remove		= timeriomem_rng_remove,