linux-kernel - Re: [PATCH v2 2/2] ASoC: rockchip: i2s: add support for grabbing output clock to codec

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Message-ID: <3448679.qPaq5DHST3@diego>
Date:	Wed, 19 Nov 2014 11:17:56 +0100
From:	Heiko Stübner <heiko@...ech.de>
To:	Jianqun Xu <jay.xu@...k-chips.com>
Cc:	lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
	tiwai@...e.de, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, huangtao@...k-chips.com,
	Sonny Rao <sonnyrao@...omium.org>
Subject: Re: [PATCH v2 2/2] ASoC: rockchip: i2s: add support for grabbing output clock to codec

Hi Jianqun,


Am Mittwoch, 19. November 2014, 16:09:27 schrieb Jianqun Xu:
> Patch is from Sonny Rao <sonnyrao@...omium.org>
that line above should read exactly:
From: Sonny Rao <sonnyrao@...omium.org>

that way git will also set the author correctly when importing the patch mbox.

> 
> 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@...omium.org>

I think we you're submitting someone elses patch you'll need a Signed-off-by 
line for yourself too [which marks that you were allowed to submit it etc], so 
it should read something like

Signed-off-by: Sonny Rao <sonnyrao@...omium.org>
Signed-off-by: Jianqun Xu <jay.xu@...k-chips.com>


> ---
> changes since v1:
> - modify commit message
> 
>  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;
> +	}

blank line here?

> +	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);


Heiko

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