Commit b149a30d authored by Alexander Clouter's avatar Alexander Clouter Committed by Herbert Xu
Browse files

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

Documentation/devicetree/bindings/hwrng/timeriomem_rng.txt

0 → 100644
+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>;

};

drivers/char/hw_random/timeriomem-rng.c

+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,