diff options
| author | lionel.debieve@st.com <lionel.debieve@st.com> | 2018-02-15 14:03:10 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-03-02 17:03:09 +0100 |
| commit | 529571ed8d8cc293c112a2061f130a3f8d458954 (patch) | |
| tree | 635118ba548288f472dae78e3841f8db35698496 /drivers/char/hw_random/stm32-rng.c | |
| parent | dt-bindings: rng: add reset node for stm32 (diff) | |
| download | linux-529571ed8d8cc293c112a2061f130a3f8d458954.tar.xz linux-529571ed8d8cc293c112a2061f130a3f8d458954.zip | |
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: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to '')
| -rw-r--r-- | drivers/char/hw_random/stm32-rng.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c index 83c695938a2d..709a8d061be3 100644 --- a/drivers/char/hw_random/stm32-rng.c +++ b/drivers/char/hw_random/stm32-rng.c @@ -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; - writel_relaxed(RNG_CR_RNGEN, priv->base + RNG_CR); + 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), |