linux-kernel - [PATCHv2 1/4] dmaengine: dw_dmac: convert to platform driver

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Date:	Wed, 26 Sep 2012 15:40:34 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Viresh Kumar <viresh.linux@...il.com>,
	Vinod Koul <vinod.koul@...el.com>, linux-kernel@...r.kernel.org
Cc:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCHv2 1/4] dmaengine: dw_dmac: convert to platform driver

From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

This driver could be used on different platforms. Thus, we converted it to be
a platform driver. The HAVE_CLK dependency is dropped away as well.

Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/dma/Kconfig   |    2 --
 drivers/dma/dw_dmac.c |   21 +++++++--------------
 2 files changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 677cd6e..75cdcb5 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -83,9 +83,7 @@ config INTEL_IOP_ADMA
 
 config DW_DMAC
 	tristate "Synopsys DesignWare AHB DMA support"
-	depends on HAVE_CLK
 	select DMA_ENGINE
-	default y if CPU_AT32AP7000
 	help
 	  Support the Synopsys DesignWare AHB DMA controller.  This
 	  can be integrated in chips such as the Atmel AT32ap7000.
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index c4b0eb3..9f0129d 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1,14 +1,15 @@
 /*
- * Driver for the Synopsys DesignWare DMA Controller (aka DMACA on
- * AVR32 systems.)
+ * Core driver for the Synopsys DesignWare DMA Controller
  *
  * Copyright (C) 2007-2008 Atmel Corporation
  * Copyright (C) 2010-2011 ST Microelectronics
+ * Copyright (C) 2012 Intel Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
+
 #include <linux/bitops.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
@@ -222,7 +223,6 @@ static inline void dwc_dump_chan_regs(struct dw_dma_chan *dwc)
 		channel_readl(dwc, CTL_LO));
 }
 
-
 static inline void dwc_chan_disable(struct dw_dma *dw, struct dw_dma_chan *dwc)
 {
 	channel_clear_bit(dw, CH_EN, dwc->mask);
@@ -1679,6 +1679,7 @@ static int dw_resume_noirq(struct device *dev)
 
 	clk_prepare_enable(dw->clk);
 	dma_writel(dw, CFG, DW_CFG_DMA_EN);
+
 	return 0;
 }
 
@@ -1700,6 +1701,7 @@ MODULE_DEVICE_TABLE(of, dw_dma_id_table);
 #endif
 
 static struct platform_driver dw_driver = {
+	.probe		= dw_probe,
 	.remove		= __devexit_p(dw_remove),
 	.shutdown	= dw_shutdown,
 	.driver = {
@@ -1709,18 +1711,9 @@ static struct platform_driver dw_driver = {
 	},
 };
 
-static int __init dw_init(void)
-{
-	return platform_driver_probe(&dw_driver, dw_probe);
-}
-subsys_initcall(dw_init);
-
-static void __exit dw_exit(void)
-{
-	platform_driver_unregister(&dw_driver);
-}
-module_exit(dw_exit);
+module_platform_driver(dw_driver);
 
+MODULE_ALIAS("platform:dw_dmac");
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller driver");
 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
-- 
1.7.10.4

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