From: Jianqun Xu <jay.xu@rock-chips.com>
To: heiko@sntech.de, lgirdwood@gmail.com, broonie@kernel.org,
perex@perex.cz, tiwai@suse.de,
linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org, alsa-devel@alsa-project.org,
linux-kernel@vger.kernel.org, huangtao@rock-chips.com
Cc: Jianqun Xu <jay.xu@rock-chips.com>, Sonny Rao <sonnyrao@chromium.org>
Subject: [PATCH 2/2] ASoC: rockchip: i2s: add support for grabbing output clock to codec
Date: Wed, 19 Nov 2014 11:07:48 +0800 [thread overview]
Message-ID: <1416366468-4744-1-git-send-email-jay.xu@rock-chips.com> (raw)
In-Reply-To: <1416366365-4632-1-git-send-email-jay.xu@rock-chips.com>
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@chromium.org>
Signed-off-by: Jianqun Xu <jay.xu@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
next prev parent reply other threads:[~2014-11-19 3:20 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-19 3:06 [PATCH 0/2] ASoC: rockchip: i2s: add support for grabbing output clock to codec Jianqun Xu
2014-11-19 3:06 ` [PATCH 1/2] ASoC: rockchip-i2s: dt: add i2s_clkout to list of clocks Jianqun Xu
2014-11-19 8:07 ` [PATCH v2 1/2] ASoC: rockchip-i2s: dt: add an optional property "i2s_clk_out" Jianqun Xu
2014-11-19 10:10 ` Mark Brown
2014-11-19 3:07 ` Jianqun Xu [this message]
2014-11-19 3:57 ` [PATCH 2/2] ASoC: rockchip: i2s: add support for grabbing output clock to codec Sonny Rao
2014-11-19 8:09 ` [PATCH v2 " Jianqun Xu
2014-11-19 10:17 ` Heiko Stübner
2014-11-19 10:27 ` Kever Yang
2014-12-02 14:49 [PATCH 0/2] rockchip: i2s: patches to add optional clock output from Jianqun Xu
2014-12-02 14:52 ` [PATCH 2/2] ASoC: rockchip: i2s: add support for grabbing output clock to codec Jianqun Xu
2014-12-02 17:54 ` Doug Anderson
2014-12-03 1:03 ` Jianqun
2014-12-03 5:18 ` Doug Anderson
2014-12-03 12:55 ` Mark Brown
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