serial: 8250_bcm2835aux: Suppress clk_get error on -EPROBE_DEFER

Suppress a gratuitous error message if devm_clk_get() returns
-EPROBE_DEFER.

Signed-off-by: Phil Elwell <[email protected]>
[lukas: extend commit message]
Signed-off-by: Lukas Wunner <[email protected]>
Reviewed-by: Matthias Brugger <[email protected]>
Reviewed-by: Nicolas Saenz Julienne <[email protected]>
Tested-by: Nicolas Saenz Julienne <[email protected]>
Link: https://lore.kernel.org/r/deafc13cdfd7a31c6a81b0db95adcd3599accc26.1579175223.git.lukas@wunner.de
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Phil Elwell

drivers/tty/serial/8250/8250_bcm2835aux.c

@@ -50,7 +50,8 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
 	data->clk = devm_clk_get(&pdev->dev, NULL);
 	ret = PTR_ERR_OR_ZERO(data->clk);
 	if (ret) {
-		dev_err(&pdev->dev, "could not get clk: %d\n", ret);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "could not get clk: %d\n", ret);
 		return ret;
 	}