Commit 529571ed authored by lionel.debieve@st.com's avatar lionel.debieve@st.com Committed by Herbert Xu

hwrng: stm32 - allow disable clock error detection

Add a new property that allow to disable the clock error
detection which is required when the clock source selected
is out of specification (which is not mandatory).
Signed-off-by: default avatarLionel Debieve <lionel.debieve@st.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 695788fd
......@@ -26,6 +26,7 @@
#define RNG_CR 0x00
#define RNG_CR_RNGEN BIT(2)
#define RNG_CR_CED BIT(5)
#define RNG_SR 0x04
#define RNG_SR_SEIS BIT(6)
......@@ -48,6 +49,7 @@ struct stm32_rng_private {
void __iomem *base;
struct clk *clk;
struct reset_control *rst;
bool ced;
};
static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
......@@ -101,7 +103,11 @@ static int stm32_rng_init(struct hwrng *rng)
if (err)
return err;
if (priv->ced)
writel_relaxed(RNG_CR_RNGEN, priv->base + RNG_CR);
else
writel_relaxed(RNG_CR_RNGEN | RNG_CR_CED,
priv->base + RNG_CR);
/* clear error indicators */
writel_relaxed(0, priv->base + RNG_SR);
......@@ -149,6 +155,8 @@ static int stm32_rng_probe(struct platform_device *ofdev)
reset_control_deassert(priv->rst);
}
priv->ced = of_property_read_bool(np, "clock-error-detect");
dev_set_drvdata(dev, priv);
priv->rng.name = dev_driver_string(dev),
......
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