[PATCH v4 2/8] dmaengine: dw: register IRQ and DMA pool with instance ID

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>]

It is really useful not only for debugging to have an IRQ line and DMA
pool labeled with driver and its instance ID. Do this for DesignWare DMA
driver.

All current users of this IP would be enhanced later on.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
 drivers/dma/dw/core.c     | 7 +++++--
 drivers/dma/dw/pci.c      | 1 +
 drivers/dma/dw/platform.c | 1 +
 drivers/dma/dw/regs.h     | 1 +
 include/linux/dma/dw.h    | 2 ++
 5 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 45bb608a1b7c..87516246c445 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -1502,8 +1502,11 @@ int dw_dma_probe(struct dw_dma_chip *chip)
 	/* Force dma off, just in case */
 	dw_dma_off(dw);
 
+	/* Device and instance ID for IRQ and DMA pool */
+	snprintf(dw->name, sizeof(dw->name), "dw:dmac%d", chip->id);
+
 	/* Create a pool of consistent memory blocks for hardware descriptors */
-	dw->desc_pool = dmam_pool_create("dw_dmac_desc_pool", chip->dev,
+	dw->desc_pool = dmam_pool_create(dw->name, chip->dev,
 					 sizeof(struct dw_desc), 4, 0);
 	if (!dw->desc_pool) {
 		dev_err(chip->dev, "No memory for descriptors dma pool\n");
@@ -1514,7 +1517,7 @@ int dw_dma_probe(struct dw_dma_chip *chip)
 	tasklet_init(&dw->tasklet, dw_dma_tasklet, (unsigned long)dw);
 
 	err = request_irq(chip->irq, dw_dma_interrupt, IRQF_SHARED,
-			  "dw_dmac", dw);
+			  dw->name, dw);
 	if (err)
 		goto err_pdata;
 
diff --git a/drivers/dma/dw/pci.c b/drivers/dma/dw/pci.c
index 0ae6c3b1d34e..456b6e6c9cca 100644
--- a/drivers/dma/dw/pci.c
+++ b/drivers/dma/dw/pci.c
@@ -47,6 +47,7 @@ static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
 		return -ENOMEM;
 
 	chip->dev = &pdev->dev;
+	chip->id = pdev->devfn;
 	chip->regs = pcim_iomap_table(pdev)[0];
 	chip->irq = pdev->irq;
 	chip->pdata = pdata;
diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c
index b1655e40cfa2..c639c60b825a 100644
--- a/drivers/dma/dw/platform.c
+++ b/drivers/dma/dw/platform.c
@@ -202,6 +202,7 @@ static int dw_probe(struct platform_device *pdev)
 		pdata = dw_dma_parse_dt(pdev);
 
 	chip->dev = dev;
+	chip->id = pdev->id;
 	chip->pdata = pdata;
 
 	chip->clk = devm_clk_get(chip->dev, "hclk");
diff --git a/drivers/dma/dw/regs.h b/drivers/dma/dw/regs.h
index 4e0128c62704..6087eba2c275 100644
--- a/drivers/dma/dw/regs.h
+++ b/drivers/dma/dw/regs.h
@@ -270,6 +270,7 @@ static inline struct dw_dma_chan *to_dw_dma_chan(struct dma_chan *chan)
 
 struct dw_dma {
 	struct dma_device	dma;
+	char			name[20];
 	void __iomem		*regs;
 	struct dma_pool		*desc_pool;
 	struct tasklet_struct	tasklet;
diff --git a/include/linux/dma/dw.h b/include/linux/dma/dw.h
index ccfd0c3777df..b63b25814d77 100644
--- a/include/linux/dma/dw.h
+++ b/include/linux/dma/dw.h
@@ -23,6 +23,7 @@ struct dw_dma;
 /**
  * struct dw_dma_chip - representation of DesignWare DMA controller hardware
  * @dev:		struct device of the DMA controller
+ * @id:			instance ID
  * @irq:		irq line
  * @regs:		memory mapped I/O space
  * @clk:		hclk clock
@@ -31,6 +32,7 @@ struct dw_dma;
  */
 struct dw_dma_chip {
 	struct device	*dev;
+	int		id;
 	int		irq;
 	void __iomem	*regs;
 	struct clk	*clk;
-- 
2.11.0

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