[PATCH 1/5] hwrng: stm32 - add reset during probe

[Lionel Debieve]

Avoid issue when probing the RNG without
reset if bad status has been detected previously

Signed-off-by: Lionel Debieve 
---
 drivers/char/hw_random/stm32-rng.c | 9 +
 1 file changed, 9 insertions(+)

diff --git a/drivers/char/hw_random/stm32-rng.c 
b/drivers/char/hw_random/stm32-rng.c
index 63d84e6f1891..83c695938a2d 100644
--- a/drivers/char/hw_random/stm32-rng.c
+++ b/drivers/char/hw_random/stm32-rng.c
@@ -21,6 +21,7 @@
 #include 
 #include 
 #include 
+#include 
 #include 
 
 #define RNG_CR 0x00
@@ -46,6 +47,7 @@ struct stm32_rng_private {
struct hwrng rng;
void __iomem *base;
struct clk *clk;
+   struct reset_control *rst;
 };
 
 static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
@@ -140,6 +142,13 @@ static int stm32_rng_probe(struct platform_device *ofdev)
if (IS_ERR(priv->clk))
return PTR_ERR(priv->clk);
 
+   priv->rst = devm_reset_control_get(>dev, NULL);
+   if (!IS_ERR(priv->rst)) {
+   reset_control_assert(priv->rst);
+   udelay(2);
+   reset_control_deassert(priv->rst);
+   }
+
dev_set_drvdata(dev, priv);
 
priv->rng.name = dev_driver_string(dev),
-- 
2.15.1

[PATCH 1/5] hwrng: stm32 - add reset during probe

[Lionel Debieve]

Avoid issue when probing the RNG without
reset if bad status has been detected previously

Signed-off-by: Lionel Debieve 
---
 drivers/char/hw_random/stm32-rng.c | 9 +
 1 file changed, 9 insertions(+)

diff --git a/drivers/char/hw_random/stm32-rng.c 
b/drivers/char/hw_random/stm32-rng.c
index 63d84e6f1891..83c695938a2d 100644
--- a/drivers/char/hw_random/stm32-rng.c
+++ b/drivers/char/hw_random/stm32-rng.c
@@ -21,6 +21,7 @@
 #include 
 #include 
 #include 
+#include 
 #include 
 
 #define RNG_CR 0x00
@@ -46,6 +47,7 @@ struct stm32_rng_private {
struct hwrng rng;
void __iomem *base;
struct clk *clk;
+   struct reset_control *rst;
 };
 
 static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
@@ -140,6 +142,13 @@ static int stm32_rng_probe(struct platform_device *ofdev)
if (IS_ERR(priv->clk))
return PTR_ERR(priv->clk);
 
+   priv->rst = devm_reset_control_get(>dev, NULL);
+   if (!IS_ERR(priv->rst)) {
+   reset_control_assert(priv->rst);
+   udelay(2);
+   reset_control_deassert(priv->rst);
+   }
+
dev_set_drvdata(dev, priv);
 
priv->rng.name = dev_driver_string(dev),
-- 
2.15.1