netdev - [PATCH 15/25] net: stmmac: Use optional clock request method to get pclk

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Message-ID: <20201214091616.13545-16-Sergey.Semin@baikalelectronics.ru>
Date:   Mon, 14 Dec 2020 12:16:05 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Rob Herring <robh+dt@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hovold <johan@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Joao Pinto <jpinto@...opsys.com>,
        Lars Persson <larper@...s.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
CC:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Vyacheslav Mitrofanov 
        <Vyacheslav.Mitrofanov@...kalelectronics.ru>,
        <netdev@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 15/25] net: stmmac: Use optional clock request method to get pclk

Let's replace the manual implementation of the optional "pclk"
functionality with using devm_clk_get_optional(). By doing so we'll
improve the code maintainability, and fix a hidden bug which will cause
problems if the "pclk" clock has been actually passed to the device, but
the clock framework failed to request it.

Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
---
 .../net/ethernet/stmicro/stmmac/stmmac_platform.c    | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index e79b3e3351a9..3809b00d3077 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -579,15 +579,13 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 
 	clk_prepare_enable(plat->stmmac_clk);
 
-	plat->pclk = devm_clk_get(&pdev->dev, "pclk");
+	plat->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
 	if (IS_ERR(plat->pclk)) {
-		if (PTR_ERR(plat->pclk) == -EPROBE_DEFER) {
-			rc = PTR_ERR(plat->pclk);
-			goto error_pclk_get;
-		}
-
-		plat->pclk = NULL;
+		rc = PTR_ERR(plat->pclk);
+		dev_err_probe(&pdev->dev, rc, "Cannot get CSR clock\n");
+		goto error_pclk_get;
 	}
+
 	clk_prepare_enable(plat->pclk);
 
 	/* Fall-back to main clock in case of no PTP ref is passed */
-- 
2.29.2