hwrng: timeriomem - added devicetree hooks
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>
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18
Documentation/devicetree/bindings/hwrng/timeriomem_rng.txt
Normal file
18
Documentation/devicetree/bindings/hwrng/timeriomem_rng.txt
Normal file
@ -0,0 +1,18 @@
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HWRNG support for the timeriomem_rng driver
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Required properties:
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- compatible : "timeriomem_rng"
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- reg : base address to sample from
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- period : wait time in microseconds to use between samples
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N.B. currently 'reg' must be four bytes wide and aligned
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Example:
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hwrng@44 {
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#address-cells = <1>;
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#size-cells = <1>;
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compatible = "timeriomem_rng";
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reg = <0x44 0x04>;
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period = <1000000>;
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};
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@ -23,6 +23,7 @@
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#include <linux/module.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/hw_random.h>
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#include <linux/hw_random.h>
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#include <linux/io.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/slab.h>
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@ -101,7 +102,7 @@ static int timeriomem_rng_probe(struct platform_device *pdev)
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int err = 0;
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int err = 0;
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int period;
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int period;
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if (!pdata) {
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if (!pdev->dev.of_node && !pdata) {
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dev_err(&pdev->dev, "timeriomem_rng_data is missing\n");
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dev_err(&pdev->dev, "timeriomem_rng_data is missing\n");
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return -EINVAL;
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return -EINVAL;
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}
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}
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@ -125,7 +126,19 @@ static int timeriomem_rng_probe(struct platform_device *pdev)
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platform_set_drvdata(pdev, priv);
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platform_set_drvdata(pdev, priv);
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period = pdata->period;
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if (pdev->dev.of_node) {
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int i;
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if (!of_property_read_u32(pdev->dev.of_node,
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"period", &i))
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period = i;
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else {
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dev_err(&pdev->dev, "missing period\n");
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err = -EINVAL;
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goto out_free;
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}
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} else
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period = pdata->period;
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priv->period = usecs_to_jiffies(period);
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priv->period = usecs_to_jiffies(period);
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if (priv->period < 1) {
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if (priv->period < 1) {
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@ -202,10 +215,17 @@ static int timeriomem_rng_remove(struct platform_device *pdev)
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return 0;
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return 0;
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}
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}
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static const struct of_device_id timeriomem_rng_match[] = {
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{ .compatible = "timeriomem_rng" },
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{},
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};
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MODULE_DEVICE_TABLE(of, timeriomem_rng_match);
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static struct platform_driver timeriomem_rng_driver = {
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static struct platform_driver timeriomem_rng_driver = {
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.driver = {
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.driver = {
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.name = "timeriomem_rng",
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.name = "timeriomem_rng",
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.owner = THIS_MODULE,
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.owner = THIS_MODULE,
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.of_match_table = timeriomem_rng_match,
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},
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},
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.probe = timeriomem_rng_probe,
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.probe = timeriomem_rng_probe,
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.remove = timeriomem_rng_remove,
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.remove = timeriomem_rng_remove,
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