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

[Serge Semin]

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 at baikalelectronics.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