[alsa-devel] [PATCH 2/2] ASoC: rockchip: i2s: add support for grabbing output clock to codec

[Jianqun]

Hi sonny

Thanks, I'm not familiar with it, thanks to remaind me:-)
I will modify it at next version together with other changes if someone review it

在 11/19/2014 11:57 AM, Sonny Rao 写道:
> Jay,
>
> On Tue, Nov 18, 2014 at 7:07 PM, Jianqun Xu <jay.xu at rock-chips.com> wrote:
>
> Mostly FYI, but if you take someone else's patch, you should also
> retain their authorship by saying:
> From: <person>
> at the top of the message. I don't really mind, but please keep it in
> mind for the future, thanks.
>
>> We need to claim the clock which is driving the codec so that when we enable
>> clock gating, we continue to clock the codec when needed.  I make this an
>> optional clock since there might be some applications where we don't need it
>> but can still use the I2S block.
>>
>> Signed-off-by: Sonny Rao <sonnyrao at chromium.org>
>> Signed-off-by: Jianqun Xu <jay.xu at rock-chips.com>
>> ---
>>  sound/soc/rockchip/rockchip_i2s.c | 11 +++++++++++
>>  1 file changed, 11 insertions(+)
>>
>> diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
>> index c74ba37..2820ade 100644
>> --- a/sound/soc/rockchip/rockchip_i2s.c
>> +++ b/sound/soc/rockchip/rockchip_i2s.c
>> @@ -28,6 +28,7 @@ struct rk_i2s_dev {
>>
>>         struct clk *hclk;
>>         struct clk *mclk;
>> +       struct clk *oclk;
>>
>>         struct snd_dmaengine_dai_dma_data capture_dma_data;
>>         struct snd_dmaengine_dai_dma_data playback_dma_data;
>> @@ -439,6 +440,14 @@ static int rockchip_i2s_probe(struct platform_device *pdev)
>>                 return PTR_ERR(i2s->mclk);
>>         }
>>
>> +       i2s->oclk = devm_clk_get(&pdev->dev, "i2s_clk_out");
>> +       if (IS_ERR(i2s->oclk)) {
>> +               dev_dbg(&pdev->dev, "Didn't find output clock\n");
>> +               i2s->oclk = NULL;
>> +       }
>> +       if (i2s->oclk)
>> +               ret = clk_prepare_enable(i2s->oclk);
>> +
>>         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>         regs = devm_ioremap_resource(&pdev->dev, res);
>>         if (IS_ERR(regs))
>> @@ -505,6 +514,8 @@ static int rockchip_i2s_remove(struct platform_device *pdev)
>>         if (!pm_runtime_status_suspended(&pdev->dev))
>>                 i2s_runtime_suspend(&pdev->dev);
>>
>> +       if (i2s->oclk)
>> +               clk_disable_unprepare(i2s->oclk);
>>         clk_disable_unprepare(i2s->mclk);
>>         clk_disable_unprepare(i2s->hclk);
>>         snd_dmaengine_pcm_unregister(&pdev->dev);
>> --
>> 1.9.1
>>
>
>

-- 
Jianqun Xu

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