[PATCH v3 3/9] ASoC: rockchip: i2s: add support for grabbing output clock to codec
From: Caesar Wang <hidden>
Date: 2016-01-15 13:50:51
Also in:
linux-rockchip, lkml
Subsystem:
arm/rockchip soc support, sound, sound - soc layer / dynamic audio power management (asoc), the rest · Maintainers:
Heiko Stuebner, Jaroslav Kysela, Takashi Iwai, Liam Girdwood, Mark Brown, Linus Torvalds
From: Sonny Rao <redacted> 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 <redacted> Signed-off-by: Jianqun Xu <redacted> Signed-off-by: Caesar Wang <redacted> --- Changes in v3: - As the perious discuss on https://patchwork.kernel.org/patch/5427131/, I think Mark likes do it in codec driver, I have to say I agree this patch in here since that's the i2s block output. I don't know if the Mark has changed his mind. - Add the suspend/resume handle the clock. sound/soc/rockchip/rockchip_i2s.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index 58ee645..5889bba 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;
@@ -47,6 +48,9 @@ static int i2s_runtime_suspend(struct device *dev) { struct rk_i2s_dev *i2s = dev_get_drvdata(dev); + if (i2s->oclk) + clk_disable_unprepare(i2s->oclk); + clk_disable_unprepare(i2s->mclk); return 0;
@@ -63,6 +67,14 @@ static int i2s_runtime_resume(struct device *dev) return ret; } + if (i2s->oclk) { + ret = clk_prepare_enable(i2s->oclk); + if (ret) { + dev_err(i2s->dev, "oclk enable failed %d\n", ret); + return ret; + } + } + return 0; }
@@ -480,6 +492,15 @@ 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))
@@ -552,6 +573,9 @@ 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);
--
1.9.1