linux-kernel - [PATCH v8 16/18] dmaengine: ti: k3-udma: Allow the driver to be built as module

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Date:   Mon, 23 Dec 2019 13:04:56 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <vkoul@...nel.org>, <robh+dt@...nel.org>, <nm@...com>,
        <ssantosh@...nel.org>
CC:     <dan.j.williams@...el.com>, <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <grygorii.strashko@...com>, <lokeshvutla@...com>,
        <t-kristo@...com>, <tony@...mide.com>, <j-keerthy@...com>,
        <vigneshr@...com>, <frowand.list@...il.com>
Subject: [PATCH v8 16/18] dmaengine: ti: k3-udma: Allow the driver to be built as module

The ring accelerator driver can be built as module since all depending
functions are exported.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
Tested-by: Keerthy <j-keerthy@...com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@...com>
---
 drivers/dma/ti/Kconfig   |  2 +-
 drivers/dma/ti/k3-udma.c | 29 +++++++++++++++++++++++++++--
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/ti/Kconfig b/drivers/dma/ti/Kconfig
index f76e06651f80..beb000be7d1b 100644
--- a/drivers/dma/ti/Kconfig
+++ b/drivers/dma/ti/Kconfig
@@ -35,7 +35,7 @@ config DMA_OMAP
 	  DMA engine is found on OMAP and DRA7xx parts.
 
 config TI_K3_UDMA
-	bool "Texas Instruments UDMA support"
+	tristate "Texas Instruments UDMA support"
 	depends on ARCH_K3 || COMPILE_TEST
 	depends on TI_SCI_PROTOCOL
 	depends on TI_SCI_INTA_IRQCHIP
diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index c97c5f6f1e29..dbed2205065a 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -12,6 +12,7 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/list.h>
+#include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
@@ -3088,6 +3089,7 @@ static const struct of_device_id udma_of_match[] = {
 	},
 	{ /* Sentinel */ },
 };
+MODULE_DEVICE_TABLE(of, udma_of_match);
 
 static int udma_get_mmrs(struct platform_device *pdev, struct udma_dev *ud)
 {
@@ -3426,15 +3428,38 @@ static int udma_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static int udma_remove(struct platform_device *pdev)
+{
+	struct udma_dev *ud = platform_get_drvdata(pdev);
+	struct udma_chan *uc;
+
+	list_for_each_entry(uc, &ud->ddev.channels, vc.chan.device_node)
+		tasklet_kill(&uc->vc.task);
+
+	of_dma_controller_free(pdev->dev.of_node);
+	dma_async_device_unregister(&ud->ddev);
+
+	/* Make sure that we did proper cleanup */
+	cancel_work_sync(&ud->purge_work);
+	udma_purge_desc_work(&ud->purge_work);
+
+	return 0;
+}
+
 static struct platform_driver udma_driver = {
 	.driver = {
 		.name	= "ti-udma",
 		.of_match_table = udma_of_match,
-		.suppress_bind_attrs = true,
 	},
 	.probe		= udma_probe,
+	.remove		= udma_remove,
 };
-builtin_platform_driver(udma_driver);
+module_platform_driver(udma_driver);
 
 /* Private interfaces to UDMA */
 #include "k3-udma-private.c"
+
+MODULE_ALIAS("platform:ti-udma");
+MODULE_DESCRIPTION("TI K3 DMA driver for CPPI 5.0 compliant devices");
+MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@...com>");
+MODULE_LICENSE("GPL v2");
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki