[PATCH 8/9] probe/dma/axi: removed redundant code from axi dma controller's probe function

[Satendra Singh Thakur <sst2005@gmail.com>]

1. In order to remove duplicate code, following functions:
platform_get_resource
devm_kzalloc
devm_ioremap_resource
devm_clk_get
platform_get_irq
clk_prepare_enable
are replaced with a macro devm_platform_probe_helper.

2. This patch depends on the file include/linux/probe-helper.h
which is pushed in previous patch [01/09].

Signed-off-by: Satendra Singh Thakur <satendrasingh.thakur@hcl.com>
Signed-off-by: Satendra Singh Thakur <sst2005@gmail.com>
---
 drivers/dma/dma-axi-dmac.c | 28 ++++++++++------------------
 1 file changed, 10 insertions(+), 18 deletions(-)

diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c
index a0ee404b736e..ac8a2355b299 100644
--- a/drivers/dma/dma-axi-dmac.c
+++ b/drivers/dma/dma-axi-dmac.c
@@ -21,6 +21,7 @@
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/fpga/adi-axi-common.h>
+#include <linux/probe-helper.h>
 
 #include <dt-bindings/dma/axi-dmac.h>
 
@@ -829,28 +830,19 @@ static int axi_dmac_probe(struct platform_device *pdev)
 	struct device_node *of_channels, *of_chan;
 	struct dma_device *dma_dev;
 	struct axi_dmac *dmac;
-	struct resource *res;
 	int ret;
 
-	dmac = devm_kzalloc(&pdev->dev, sizeof(*dmac), GFP_KERNEL);
-	if (!dmac)
-		return -ENOMEM;
-
-	dmac->irq = platform_get_irq(pdev, 0);
-	if (dmac->irq < 0)
-		return dmac->irq;
-	if (dmac->irq == 0)
+	/*
+	 * This macro internally combines following functions:
+	 * devm_kzalloc, platform_get_resource, devm_ioremap_resource,
+	 * devm_clk_get, platform_get_irq
+	 */
+	ret = devm_platform_probe_helper(pdev, dmac, NULL);
+	if (ret < 0)
+		return ret;
+	else if (!dmac->irq)
 		return -EINVAL;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	dmac->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(dmac->base))
-		return PTR_ERR(dmac->base);
-
-	dmac->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(dmac->clk))
-		return PTR_ERR(dmac->clk);
-
 	INIT_LIST_HEAD(&dmac->chan.active_descs);
 
 	of_channels = of_get_child_by_name(pdev->dev.of_node, "adi,channels");
-- 
2.17.1