linux-kernel - [PATCH v2 1/1] serial: 8250_bcm7271: Use devm_clk_get_optional

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Message-Id: <20231005124550.3607234-1-andriy.shevchenko@linux.intel.com>
Date:   Thu,  5 Oct 2023 15:45:50 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Al Cooper <alcooperx@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Andi Shyti <andi.shyti@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 1/1] serial: 8250_bcm7271: Use devm_clk_get_optional_enabled()

Use devm_clk_get_optional_enabled() to simplify the code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: fixed the returned value (Andi)
 drivers/tty/serial/8250/8250_bcm7271.c | 24 +++++++++---------------
 1 file changed, 9 insertions(+), 15 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c
index 1a853a08654a..55dea2539c47 100644
--- a/drivers/tty/serial/8250/8250_bcm7271.c
+++ b/drivers/tty/serial/8250/8250_bcm7271.c
@@ -1015,26 +1015,23 @@ static int brcmuart_probe(struct platform_device *pdev)
 	of_property_read_u32(np, "clock-frequency", &clk_rate);
 
 	/* See if a Baud clock has been specified */
-	baud_mux_clk = devm_clk_get(dev, "sw_baud");
-	if (IS_ERR(baud_mux_clk)) {
-		if (PTR_ERR(baud_mux_clk) == -EPROBE_DEFER) {
-			ret = -EPROBE_DEFER;
-			goto release_dma;
-		}
-		dev_dbg(dev, "BAUD MUX clock not specified\n");
-	} else {
+	baud_mux_clk = devm_clk_get_optional_enabled(dev, "sw_baud");
+	ret = PTR_ERR_OR_ZERO(baud_mux_clk);
+	if (ret)
+		goto release_dma;
+	if (baud_mux_clk) {
 		dev_dbg(dev, "BAUD MUX clock found\n");
-		ret = clk_prepare_enable(baud_mux_clk);
-		if (ret)
-			goto release_dma;
+
 		priv->baud_mux_clk = baud_mux_clk;
 		init_real_clk_rates(dev, priv);
 		clk_rate = priv->default_mux_rate;
+	} else {
+		dev_dbg(dev, "BAUD MUX clock not specified\n");
 	}
 
 	if (clk_rate == 0) {
 		ret = dev_err_probe(dev, -EINVAL, "clock-frequency or clk not defined\n");
-		goto err_clk_disable;
+		goto release_dma;
 	}
 
 	dev_dbg(dev, "DMA is %senabled\n", priv->dma_enabled ? "" : "not ");
@@ -1118,8 +1115,6 @@ static int brcmuart_probe(struct platform_device *pdev)
 	serial8250_unregister_port(priv->line);
 err:
 	brcmuart_free_bufs(dev, priv);
-err_clk_disable:
-	clk_disable_unprepare(baud_mux_clk);
 release_dma:
 	if (priv->dma_enabled)
 		brcmuart_arbitration(priv, 0);
@@ -1134,7 +1129,6 @@ static int brcmuart_remove(struct platform_device *pdev)
 	hrtimer_cancel(&priv->hrt);
 	serial8250_unregister_port(priv->line);
 	brcmuart_free_bufs(&pdev->dev, priv);
-	clk_disable_unprepare(priv->baud_mux_clk);
 	if (priv->dma_enabled)
 		brcmuart_arbitration(priv, 0);
 	return 0;
-- 
2.40.0.1.gaa8946217a0b