linux-kernel - [PATCHv1 1/6] dmaengine: dw_dmac: Remove clk API dependency

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Date:	Tue, 25 Sep 2012 15:13:05 +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: [PATCHv1 1/6] dmaengine: dw_dmac: Remove clk API dependency

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

Not all platforms support clk API.

Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/dma/Kconfig        |    1 -
 drivers/dma/dw_dmac.c      |   18 +++---------------
 drivers/dma/dw_dmac_regs.h |    1 -
 3 files changed, 3 insertions(+), 17 deletions(-)

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 677cd6e..df32537 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -83,7 +83,6 @@ 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
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 9316d03..d9344a7 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1,9 +1,9 @@
 /*
- * 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
@@ -12,7 +12,6 @@
 #define VERBOSE_DEBUG
 #define DEBUG
 #include <linux/bitops.h>
-#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/dmaengine.h>
 #include <linux/dma-mapping.h>
@@ -224,7 +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);
@@ -1508,11 +1506,6 @@ static int __devinit dw_probe(struct platform_device *pdev)
 	if (!dw)
 		return -ENOMEM;
 
-	dw->clk = devm_clk_get(&pdev->dev, "hclk");
-	if (IS_ERR(dw->clk))
-		return PTR_ERR(dw->clk);
-	clk_prepare_enable(dw->clk);
-
 	dw->regs = regs;
 
 	/* get hardware configuration parameters */
@@ -1657,19 +1650,14 @@ static int __devexit dw_remove(struct platform_device *pdev)
 
 static void dw_shutdown(struct platform_device *pdev)
 {
-	struct dw_dma	*dw = platform_get_drvdata(pdev);
-
 	dw_dma_off(platform_get_drvdata(pdev));
-	clk_disable_unprepare(dw->clk);
 }
 
 static int dw_suspend_noirq(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
-	struct dw_dma	*dw = platform_get_drvdata(pdev);
 
 	dw_dma_off(platform_get_drvdata(pdev));
-	clk_disable_unprepare(dw->clk);
 
 	return 0;
 }
@@ -1679,8 +1667,8 @@ static int dw_resume_noirq(struct device *dev)
 	struct platform_device *pdev = to_platform_device(dev);
 	struct dw_dma	*dw = platform_get_drvdata(pdev);
 
-	clk_prepare_enable(dw->clk);
 	dma_writel(dw, CFG, DW_CFG_DMA_EN);
+
 	return 0;
 }
 
diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h
index ff39fa6..50e0b63 100644
--- a/drivers/dma/dw_dmac_regs.h
+++ b/drivers/dma/dw_dmac_regs.h
@@ -229,7 +229,6 @@ struct dw_dma {
 	struct dma_device	dma;
 	void __iomem		*regs;
 	struct tasklet_struct	tasklet;
-	struct clk		*clk;
 
 	u8			all_chan_mask;
 
-- 
1.7.10.4

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