spi: atmel-quadspi: Convert to platform remove

Merge series from Uwe Kleine-König <u.kleine-koenig@pengutronix.de>:

This series converts the atmel-quadspi driver to use the .remove_new()
callback that doesn't return an int but void. The motivation is to not
give driver authors a reason to (wrongly) believe that returning an
error code was sensible error handling. In fact the spi core only emits
a warning message in this case and otherwise continues as if the return
value was zero. This usually yields resource leaks that sometimes can
lead to exceptions later on.

The atmel-quadspi driver is one of these drivers that got error handling
wrong, this is fixed here and in the last patch the driver is converted
to .remove_new() with the eventual goal to change .remove() to return
void once all drivers are converted this way.

drivers/spi/atmel-quadspi.c

@@ -700,25 +700,33 @@ static int atmel_qspi_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int atmel_qspi_remove(struct platform_device *pdev)
+static void atmel_qspi_remove(struct platform_device *pdev)
 {
 	struct spi_controller *ctrl = platform_get_drvdata(pdev);
 	struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 	int ret;
 
-	ret = pm_runtime_resume_and_get(&pdev->dev);
-	if (ret < 0)
-		return ret;
-
 	spi_unregister_controller(ctrl);
-	atmel_qspi_write(QSPI_CR_QSPIDIS, aq, QSPI_CR);
+
+	ret = pm_runtime_get_sync(&pdev->dev);
+	if (ret >= 0) {
+		atmel_qspi_write(QSPI_CR_QSPIDIS, aq, QSPI_CR);
+		clk_disable(aq->qspick);
+		clk_disable(aq->pclk);
+	} else {
+		/*
+		 * atmel_qspi_runtime_{suspend,resume} just disable and enable
+		 * the two clks respectively. So after resume failed these are
+		 * off, and we skip hardware access and disabling these clks again.
+		 */
+		dev_warn(&pdev->dev, "Failed to resume device on remove\n");
+	}
+
+	clk_unprepare(aq->qspick);
+	clk_unprepare(aq->pclk);
 
 	pm_runtime_disable(&pdev->dev);
 	pm_runtime_put_noidle(&pdev->dev);
-
-	clk_disable_unprepare(aq->qspick);
-	clk_disable_unprepare(aq->pclk);
-	return 0;
 }
 
 static int __maybe_unused atmel_qspi_suspend(struct device *dev)
@@ -786,7 +794,11 @@ static int __maybe_unused atmel_qspi_runtime_resume(struct device *dev)
 	if (ret)
 		return ret;
 
-	return clk_enable(aq->qspick);
+	ret = clk_enable(aq->qspick);
+	if (ret)
+		clk_disable(aq->pclk);
+
+	return ret;
 }
 
 static const struct dev_pm_ops __maybe_unused atmel_qspi_pm_ops = {
@@ -823,7 +835,7 @@ static struct platform_driver atmel_qspi_driver = {
 		.pm	= pm_ptr(&atmel_qspi_pm_ops),
 	},
 	.probe		= atmel_qspi_probe,
-	.remove		= atmel_qspi_remove,
+	.remove_new	= atmel_qspi_remove,
 };
 module_platform_driver(atmel_qspi_driver);