hw_random: timeriomem_rng: Allow setting RNG quality from platform data (284e7638) · Commits · 戴 / test

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>

drivers/char/hw_random/timeriomem-rng.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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);

include/linux/timeriomem-rng.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -13,4 +13,7 @@ struct timeriomem_rng_data {

		/* measures in usecs */
		unsigned int period;

		/* bits of entropy per 1024 bits read */
		unsigned int quality;
		};

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