diff options
| author | Rick Altherr <raltherr@google.com> | 2017-05-22 14:12:24 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2017-06-01 12:55:58 +0800 |
| commit | 284e76387c38260e834c99b010a68d75fc46b394 (patch) | |
| tree | d2558a6b59909e0ee71a276d09101a33cb124e9f | |
| parent | b14c53451719dc6ec8e6387e5be3be23294a6f1d (diff) | |
hw_random: timeriomem_rng: Allow setting RNG quality from platform data
When a hw_random device's quality is non-zero, it will automatically be
used to fill the kernel's entropy pool. Since timeriomem_rng is used by
many different devices, the quality needs to be provided by platform
data or device tree.
Signed-off-by: Rick Altherr <raltherr@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | drivers/char/hw_random/timeriomem-rng.c | 7 | ||||
| -rw-r--r-- | include/linux/timeriomem-rng.h | 3 |
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/char/hw_random/timeriomem-rng.c b/drivers/char/hw_random/timeriomem-rng.c index a0faa5f05deb..03ff5483d865 100644 --- a/drivers/char/hw_random/timeriomem-rng.c +++ b/drivers/char/hw_random/timeriomem-rng.c @@ -151,8 +151,15 @@ static int timeriomem_rng_probe(struct platform_device *pdev) dev_err(&pdev->dev, "missing period\n"); return -EINVAL; } + + if (!of_property_read_u32(pdev->dev.of_node, + "quality", &i)) + priv->rng_ops.quality = i; + else + priv->rng_ops.quality = 0; } else { period = pdata->period; + priv->rng_ops.quality = pdata->quality; } priv->period = ns_to_ktime(period * NSEC_PER_USEC); diff --git a/include/linux/timeriomem-rng.h b/include/linux/timeriomem-rng.h index 46eb27ddbfab..3e00122bcf88 100644 --- a/include/linux/timeriomem-rng.h +++ b/include/linux/timeriomem-rng.h @@ -13,4 +13,7 @@ struct timeriomem_rng_data { /* measures in usecs */ unsigned int period; + + /* bits of entropy per 1024 bits read */ + unsigned int quality; }; |