[PATCH v3 3/3] spi: geni-qcom: Use devm functions to simplify code

[Jinjie Ruan <ruanjinjie@xxxxxxxxxx>]

Use devm_pm_runtime_enable(), devm_request_irq() and
devm_spi_register_controller() to simplify code.

And also register a callback spi_geni_release_dma_chan() with
devm_add_action_or_reset(), to release dma channel in both error
and device detach path, which can make sure the release sequence is
consistent with the original one.

1. Unregister spi controller.
2. Free the IRQ.
3. Free DMA chans
4. Disable runtime PM.

So the remove function can also be removed.

Suggested-by: Doug Anderson <dianders@xxxxxxxxxxxx>
Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
---
v3:
- Land the rest of the cleanups afterwards.
---
 drivers/spi/spi-geni-qcom.c | 37 +++++++++++++------------------------
 1 file changed, 13 insertions(+), 24 deletions(-)

diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c
index 6f4057330444..8b0039d14605 100644
--- a/drivers/spi/spi-geni-qcom.c
+++ b/drivers/spi/spi-geni-qcom.c
@@ -632,8 +632,10 @@ static int spi_geni_grab_gpi_chan(struct spi_geni_master *mas)
 	return ret;
 }
 
-static void spi_geni_release_dma_chan(struct spi_geni_master *mas)
+static void spi_geni_release_dma_chan(void *data)
 {
+	struct spi_geni_master *mas = data;
+
 	if (mas->rx) {
 		dma_release_channel(mas->rx);
 		mas->rx = NULL;
@@ -1132,6 +1134,12 @@ static int spi_geni_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	ret = devm_add_action_or_reset(dev, spi_geni_release_dma_chan, spi);
+	if (ret) {
+		dev_err(dev, "Unable to add action.\n");
+		return ret;
+	}
+
 	/*
 	 * check the mode supported and set_cs for fifo mode only
 	 * for dma (gsi) mode, the gsi will set cs based on params passed in
@@ -1146,33 +1154,15 @@ static int spi_geni_probe(struct platform_device *pdev)
 	if (mas->cur_xfer_mode == GENI_GPI_DMA)
 		spi->flags = SPI_CONTROLLER_MUST_TX;
 
-	ret = request_irq(mas->irq, geni_spi_isr, 0, dev_name(dev), spi);
+	ret = devm_request_irq(dev, mas->irq, geni_spi_isr, 0, dev_name(dev), spi);
 	if (ret)
-		goto spi_geni_release_dma;
+		return ret;
 
-	ret = spi_register_controller(spi);
+	ret = devm_spi_register_controller(dev, spi);
 	if (ret)
-		goto spi_geni_probe_free_irq;
+		return ret;
 
 	return 0;
-spi_geni_probe_free_irq:
-	free_irq(mas->irq, spi);
-spi_geni_release_dma:
-	spi_geni_release_dma_chan(mas);
-	return ret;
-}
-
-static void spi_geni_remove(struct platform_device *pdev)
-{
-	struct spi_controller *spi = platform_get_drvdata(pdev);
-	struct spi_geni_master *mas = spi_controller_get_devdata(spi);
-
-	/* Unregister _before_ disabling pm_runtime() so we stop transfers */
-	spi_unregister_controller(spi);
-
-	free_irq(mas->irq, spi);
-
-	spi_geni_release_dma_chan(mas);
 }
 
 static int __maybe_unused spi_geni_runtime_suspend(struct device *dev)
@@ -1254,7 +1244,6 @@ MODULE_DEVICE_TABLE(of, spi_geni_dt_match);
 
 static struct platform_driver spi_geni_driver = {
 	.probe  = spi_geni_probe,
-	.remove_new = spi_geni_remove,
 	.driver = {
 		.name = "geni_spi",
 		.pm = &spi_geni_pm_ops,
-- 
2.34.1