hwrng: imx-rngc - use devm_clk_get_enabled

[ Upstream commit 6a2bc44 ]

Use the new devm_clk_get_enabled function to get our clock.

We don't have to disable and unprepare the clock ourselves any more in
error paths and in the remove function.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Stable-dep-of: 10a2199 ("hwrng: imx-rngc - Moving IRQ handler registering after imx_rngc_irq_mask_clear()")
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/char/hw_random/imx-rngc.c

@@ -245,7 +245,7 @@ static int imx_rngc_probe(struct platform_device *pdev)
 	if (IS_ERR(rngc->base))
 		return PTR_ERR(rngc->base);
 
-	rngc->clk = devm_clk_get(&pdev->dev, NULL);
+	rngc->clk = devm_clk_get_enabled(&pdev->dev, NULL);
 	if (IS_ERR(rngc->clk)) {
 		dev_err(&pdev->dev, "Can not get rng_clk\n");
 		return PTR_ERR(rngc->clk);
@@ -255,26 +255,20 @@ static int imx_rngc_probe(struct platform_device *pdev)
 	if (irq < 0)
 		return irq;
 
-	ret = clk_prepare_enable(rngc->clk);
-	if (ret)
-		return ret;
-
 	ver_id = readl(rngc->base + RNGC_VER_ID);
 	rng_type = ver_id >> RNGC_TYPE_SHIFT;
 	/*
 	 * This driver supports only RNGC and RNGB. (There's a different
 	 * driver for RNGA.)
 	 */
-	if (rng_type != RNGC_TYPE_RNGC && rng_type != RNGC_TYPE_RNGB) {
-		ret = -ENODEV;
-		goto err;
-	}
+	if (rng_type != RNGC_TYPE_RNGC && rng_type != RNGC_TYPE_RNGB)
+		return -ENODEV;
 
 	ret = devm_request_irq(&pdev->dev,
 			irq, imx_rngc_irq, 0, pdev->name, (void *)rngc);
 	if (ret) {
 		dev_err(rngc->dev, "Can't get interrupt working.\n");
-		goto err;
+		return ret;
 	}
 
 	init_completion(&rngc->rng_op_done);
@@ -294,26 +288,21 @@ static int imx_rngc_probe(struct platform_device *pdev)
 		ret = imx_rngc_self_test(rngc);
 		if (ret) {
 			dev_err(rngc->dev, "self test failed\n");
-			goto err;
+			return ret;
 		}
 	}
 
 	ret = hwrng_register(&rngc->rng);
 	if (ret) {
 		dev_err(&pdev->dev, "hwrng registration failed\n");
-		goto err;
+		return ret;
 	}
 
 	dev_info(&pdev->dev,
 		"Freescale RNG%c registered (HW revision %d.%02d)\n",
 		rng_type == RNGC_TYPE_RNGB ? 'B' : 'C',
 		(ver_id >> RNGC_VER_MAJ_SHIFT) & 0xff, ver_id & 0xff);
 	return 0;
-
-err:
-	clk_disable_unprepare(rngc->clk);
-
-	return ret;
 }
 
 static int __exit imx_rngc_remove(struct platform_device *pdev)
@@ -322,8 +311,6 @@ static int __exit imx_rngc_remove(struct platform_device *pdev)
 
 	hwrng_unregister(&rngc->rng);
 
-	clk_disable_unprepare(rngc->clk);
-
 	return 0;
 }