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hwrng: timeriomem - added devicetree hooks

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This patch allows timeriomem_rng to be used via devicetree.

Signed-off-by: Alexander Clouter <alex@digriz.org.uk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Alexander Clouter 2013-03-31 17:34:51 +01:00 committed by Herbert Xu
parent 1907da78bf
commit b149a30d87
2 changed files with 40 additions and 2 deletions
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18
Documentation/devicetree/bindings/hwrng/timeriomem_rng.txt Normal file
View File

@ -0,0 +1,18 @@
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>;
};

24
drivers/char/hw_random/timeriomem-rng.c
View File

@ -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;
}
@ -125,7 +126,19 @@ static int timeriomem_rng_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, priv);
period = pdata->period;
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);
if (priv->period < 1) {
@ -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,