[PATCH v5 3/3] dmaengine: altera-msgdma: add OF support
From: Olivier Dautricourt <hidden>
Date: 2021-05-18 13:25:54
Also in:
dmaengine, lkml
Subsystem:
altera msgdma ip core driver, dma generic offload engine subsystem, the rest · Maintainers:
Olivier Dautricourt, Vinod Koul, Linus Torvalds
This driver had no device tree support.
- add compatible field "altr,socfpga-msgdma"
- define msgdma_of_xlate, with no argument
- register dma controller with of_dma_controller_register
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Olivier Dautricourt <redacted>
---
Notes:
Changes in v2:
none
Changes from v2 to v3:
Removed CONFIG_OF #ifdef's and use if (IS_ENABLED(CONFIG_OF))
only once.
Changes from v3 to v4
Reintroduce #ifdef CONFIG_OF for msgdma_match
as it produces a unused variable warning
Changes from v4 to v5
- As per Rob's comments on patch 1/2:
change compatible field from altr,msgdma to
altr,socfpga-msgdma.
- change commit title to fit previous commits naming
- As per Vinod's comments:
- use dma_get_slave_channel instead of dma_get_any_slave_channel which
makes more sense.
- remove if (IS_ENABLED(CONFIG_OF)) for of_dma_controller_register
as it is taken care by the core
drivers/dma/altera-msgdma.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/drivers/dma/altera-msgdma.c b/drivers/dma/altera-msgdma.c
index 9a841ce5f0c5..acf0990d73ae 100644
--- a/drivers/dma/altera-msgdma.c
+++ b/drivers/dma/altera-msgdma.c@@ -19,6 +19,7 @@ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/slab.h> +#include <linux/of_dma.h> #include "dmaengine.h"
@@ -784,6 +785,14 @@ static int request_and_map(struct platform_device *pdev, const char *name, return 0; } +static struct dma_chan *msgdma_of_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct msgdma_device *d = ofdma->of_dma_data; + + return dma_get_slave_channel(&d->dmachan); +} + /** * msgdma_probe - Driver probe function * @pdev: Pointer to the platform_device structure
@@ -888,6 +897,13 @@ static int msgdma_probe(struct platform_device *pdev) if (ret) goto fail; + ret = of_dma_controller_register(pdev->dev.of_node, + msgdma_of_xlate, mdev); + if (ret) { + dev_err(&pdev->dev, "failed to register dma controller"); + goto fail; + } + dev_notice(&pdev->dev, "Altera mSGDMA driver probe success\n"); return 0;
@@ -916,9 +932,19 @@ static int msgdma_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_OF +static const struct of_device_id msgdma_match[] = { + { .compatible = "altr,socfpga-msgdma", }, + { } +}; + +MODULE_DEVICE_TABLE(of, msgdma_match); +#endif + static struct platform_driver msgdma_driver = { .driver = { .name = "altera-msgdma", + .of_match_table = of_match_ptr(msgdma_match), }, .probe = msgdma_probe, .remove = msgdma_remove, --
2.31.0.rc2