linux-kernel - [PATCH 2/9] probe/dma/jz4740: removed redundant code from jz4740 dma controller's probe function

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Date:   Sun, 15 Sep 2019 12:59:03 +0530
From:   Satendra Singh Thakur <sst2005@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     satendrasingh.thakur@....com,
        Satendra Singh Thakur <sst2005@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/9] probe/dma/jz4740: removed redundant code from jz4740 dma controller's     probe function

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

2. Added irq field in the struct jz4740_dma_dev.
Removed platform_get_irq from remove method.

3. 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@....com>
Signed-off-by: Satendra Singh Thakur <sst2005@...il.com>
---
 drivers/dma/dma-jz4740.c | 33 +++++++++++++--------------------
 1 file changed, 13 insertions(+), 20 deletions(-)

diff --git a/drivers/dma/dma-jz4740.c b/drivers/dma/dma-jz4740.c
index 39c676c47082..b012896d02bb 100644
--- a/drivers/dma/dma-jz4740.c
+++ b/drivers/dma/dma-jz4740.c
@@ -15,6 +15,7 @@
 #include <linux/spinlock.h>
 #include <linux/irq.h>
 #include <linux/clk.h>
+#include <linux/probe-helper.h>
 
 #include "virt-dma.h"
 
@@ -121,6 +122,7 @@ struct jz4740_dma_dev {
 	struct dma_device ddev;
 	void __iomem *base;
 	struct clk *clk;
+	int irq;
 
 	struct jz4740_dmaengine_chan chan[JZ_DMA_NR_CHANS];
 };
@@ -519,27 +521,19 @@ static int jz4740_dma_probe(struct platform_device *pdev)
 	struct jz4740_dma_dev *dmadev;
 	struct dma_device *dd;
 	unsigned int i;
-	struct resource *res;
 	int ret;
-	int irq;
 
-	dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL);
-	if (!dmadev)
-		return -EINVAL;
+	/*
+	 * This macro internally combines following functions:
+	 * devm_kzalloc, platform_get_resource, devm_ioremap_resource,
+	 * devm_clk_get, platform_get_irq, clk_prepare_enable
+	 */
+	ret = devm_platform_probe_helper_clk(pdev, dmadev, "dma");
+	if (ret < 0)
+		return ret;
 
 	dd = &dmadev->ddev;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	dmadev->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(dmadev->base))
-		return PTR_ERR(dmadev->base);
-
-	dmadev->clk = clk_get(&pdev->dev, "dma");
-	if (IS_ERR(dmadev->clk))
-		return PTR_ERR(dmadev->clk);
-
-	clk_prepare_enable(dmadev->clk);
-
 	dma_cap_set(DMA_SLAVE, dd->cap_mask);
 	dma_cap_set(DMA_CYCLIC, dd->cap_mask);
 	dd->device_free_chan_resources = jz4740_dma_free_chan_resources;
@@ -567,8 +561,8 @@ static int jz4740_dma_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_clk;
 
-	irq = platform_get_irq(pdev, 0);
-	ret = request_irq(irq, jz4740_dma_irq, 0, dev_name(&pdev->dev), dmadev);
+	ret = request_irq(dmadev->irq, jz4740_dma_irq, 0,
+			dev_name(&pdev->dev), dmadev);
 	if (ret)
 		goto err_unregister;
 
@@ -598,9 +592,8 @@ static void jz4740_cleanup_vchan(struct dma_device *dmadev)
 static int jz4740_dma_remove(struct platform_device *pdev)
 {
 	struct jz4740_dma_dev *dmadev = platform_get_drvdata(pdev);
-	int irq = platform_get_irq(pdev, 0);
 
-	free_irq(irq, dmadev);
+	free_irq(dmadev->irq, dmadev);
 
 	jz4740_cleanup_vchan(&dmadev->ddev);
 	dma_async_device_unregister(&dmadev->ddev);
-- 
2.17.1