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

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Date:	Wed, 26 Sep 2012 21:00:08 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	viresh kumar <viresh.kumar@...aro.org>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	spear-devel <spear-devel@...t.st.com>
Subject: Re: [PATCHv2 1/4] dmaengine: dw_dmac: convert to platform driver

On Wed, Sep 26, 2012 at 5:13 PM, viresh kumar <viresh.kumar@...aro.org> wrote:
> On Wed, Sep 26, 2012 at 6:10 PM, Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
>> 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.
>
> Commit log and patch content don't match. :(
> We aren't converting it to a platform driver, it is already one.
Okay, any suggestion for this part?

>> 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
>
> This matches subject.
>
>>         select DMA_ENGINE
>> -       default y if CPU_AT32AP7000
>
> This doesn't. If you want this change, do this in a separate patch.
Will do separate patch. However this change doesn't interfere with
configuration on my side. So, might be better to keep that line to
have compatibility with older kernels?

>
>>         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));
>>  }
>>
>> -
>
> Above + and - also don't belong to this patch
Separate patch? Will do.

>
>>  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);
>
> This should be a separate patch as well
Good. Will do.

>> +MODULE_ALIAS("platform:dw_dmac");
>>  MODULE_LICENSE("GPL v2");
>>  MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller driver");
>>  MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");

-- 
With Best Regards,
Andy Shevchenko
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