hwrng: stm32 - cache device pointer in struct stm32_rng_private

Place device pointer in struct stm32_rng_private and use it all over the
place to get rid of the horrible type casts throughout the driver.

No functional change.
Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/stm32-rng.c

@@ -70,6 +70,7 @@ struct stm32_rng_config {
 
 struct stm32_rng_private {
 	struct hwrng rng;
+	struct device *dev;
 	void __iomem *base;
 	struct clk *clk;
 	struct reset_control *rst;
@@ -99,7 +100,7 @@ struct stm32_rng_private {
  */
 static int stm32_rng_conceal_seed_error_cond_reset(struct stm32_rng_private *priv)
 {
-	struct device *dev = (struct device *)priv->rng.priv;
+	struct device *dev = priv->dev;
 	u32 sr = readl_relaxed(priv->base + RNG_SR);
 	u32 cr = readl_relaxed(priv->base + RNG_CR);
 	int err;
@@ -171,7 +172,7 @@ static int stm32_rng_conceal_seed_error(struct hwrng *rng)
 {
 	struct stm32_rng_private *priv = container_of(rng, struct stm32_rng_private, rng);
 
-	dev_dbg((struct device *)priv->rng.priv, "Concealing seed error\n");
+	dev_dbg(priv->dev, "Concealing seed error\n");
 
 	if (priv->data->has_cond_reset)
 		return stm32_rng_conceal_seed_error_cond_reset(priv);
@@ -187,7 +188,7 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
 	int retval = 0, err = 0;
 	u32 sr;
 
-	retval = pm_runtime_resume_and_get((struct device *)priv->rng.priv);
+	retval = pm_runtime_resume_and_get(priv->dev);
 	if (retval)
 		return retval;
 
@@ -206,8 +207,7 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
 								   sr, sr,
 								   10, 50000);
 			if (err) {
-				dev_err((struct device *)priv->rng.priv,
-					"%s: timeout %x!\n", __func__, sr);
+				dev_err(priv->dev, "%s: timeout %x!\n", __func__, sr);
 				break;
 			}
 		} else if (!sr) {
@@ -220,8 +220,7 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
 				err = stm32_rng_conceal_seed_error(rng);
 				i++;
 				if (err && i > RNG_NB_RECOVER_TRIES) {
-					dev_err((struct device *)priv->rng.priv,
-						"Couldn't recover from seed error\n");
+					dev_err(priv->dev, "Couldn't recover from seed error\n");
 					retval = -ENOTRECOVERABLE;
 					goto exit_rpm;
 				}
@@ -239,8 +238,7 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
 			err = stm32_rng_conceal_seed_error(rng);
 			i++;
 			if (err && i > RNG_NB_RECOVER_TRIES) {
-				dev_err((struct device *)priv->rng.priv,
-					"Couldn't recover from seed error");
+				dev_err(priv->dev, "Couldn't recover from seed error");
 				retval = -ENOTRECOVERABLE;
 				goto exit_rpm;
 			}
@@ -255,8 +253,8 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
 	}
 
 exit_rpm:
-	pm_runtime_mark_last_busy((struct device *) priv->rng.priv);
-	pm_runtime_put_sync_autosuspend((struct device *) priv->rng.priv);
+	pm_runtime_mark_last_busy(priv->dev);
+	pm_runtime_put_sync_autosuspend(priv->dev);
 
 	return retval || !wait ? retval : -EIO;
 }
@@ -331,8 +329,7 @@ static int stm32_rng_init(struct hwrng *rng)
 							10, 50000);
 		if (err) {
 			clk_disable_unprepare(priv->clk);
-			dev_err((struct device *)priv->rng.priv,
-				"%s: timeout %x!\n", __func__, reg);
+			dev_err(priv->dev, "%s: timeout %x!\n", __func__, reg);
 			return -EINVAL;
 		}
 	} else {
@@ -360,8 +357,7 @@ static int stm32_rng_init(struct hwrng *rng)
 						10, 100000);
 	if (err || (reg & ~RNG_SR_DRDY)) {
 		clk_disable_unprepare(priv->clk);
-		dev_err((struct device *)priv->rng.priv,
-			"%s: timeout:%x SR: %x!\n", __func__, err, reg);
+		dev_err(priv->dev, "%s: timeout:%x SR: %x!\n", __func__, err, reg);
 		return -EINVAL;
 	}
 
@@ -467,8 +463,7 @@ static int __maybe_unused stm32_rng_resume(struct device *dev)
 
 		if (err) {
 			clk_disable_unprepare(priv->clk);
-			dev_err((struct device *)priv->rng.priv,
-				"%s: timeout:%x CR: %x!\n", __func__, err, reg);
+			dev_err(priv->dev, "%s: timeout:%x CR: %x!\n", __func__, err, reg);
 			return -EINVAL;
 		}
 	} else {
@@ -543,6 +538,7 @@ static int stm32_rng_probe(struct platform_device *ofdev)
 
 	priv->ced = of_property_read_bool(np, "clock-error-detect");
 	priv->lock_conf = of_property_read_bool(np, "st,rng-lock-conf");
+	priv->dev = dev;
 
 	priv->data = of_device_get_match_data(dev);
 	if (!priv->data)
@@ -553,7 +549,6 @@ static int stm32_rng_probe(struct platform_device *ofdev)
 	priv->rng.name = dev_driver_string(dev);
 	priv->rng.init = stm32_rng_init;
 	priv->rng.read = stm32_rng_read;
-	priv->rng.priv = (unsigned long) dev;
 	priv->rng.quality = 900;
 
 	pm_runtime_set_autosuspend_delay(dev, 100);