phy: qcom-qmp-usb: clean up pipe clock handling

Clean up the pipe clock handling by using dev_err_probe() to handle
probe deferral and dropping the obsolete comment that claimed that the
pipe clock was optional for some other PHY types.
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20220623113314.29761-4-johan+linaro@kernel.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/qualcomm/phy-qcom-qmp-usb.c

@@ -2530,22 +2530,11 @@ int qcom_qmp_phy_usb_create(struct device *dev, struct device_node *np, int id,
 	if (!qphy->pcs_misc)
 		dev_vdbg(dev, "PHY pcs_misc-reg not used\n");
 
-	/*
-	 * Get PHY's Pipe clock, if any. USB3 and PCIe are PIPE3
-	 * based phys, so they essentially have pipe clock. So,
-	 * we return error in case phy is USB3 or PIPE type.
-	 * Otherwise, we initialize pipe clock to NULL for
-	 * all phys that don't need this.
-	 */
 	snprintf(prop_name, sizeof(prop_name), "pipe%d", id);
 	qphy->pipe_clk = devm_get_clk_from_child(dev, np, prop_name);
 	if (IS_ERR(qphy->pipe_clk)) {
-		ret = PTR_ERR(qphy->pipe_clk);
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev,
-				"failed to get lane%d pipe_clk, %d\n",
-				id, ret);
-		return ret;
+		return dev_err_probe(dev, PTR_ERR(qphy->pipe_clk),
+				     "failed to get lane%d pipe clock\n", id);
 	}
 
 	generic_phy = devm_phy_create(dev, np, &qcom_qmp_phy_usb_ops);