linux-kernel - [PATCH 03/14] ASoC: sun4i-i2s: Add apb reset

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Message-Id: <2c5abe6578c8e4e841cb59357d88ce397551a593.1475571575.git.mylene.josserand@free-electrons.com>
Date:   Tue,  4 Oct 2016 11:46:16 +0200
From:   Mylène Josserand 
        <mylene.josserand@...e-electrons.com>
To:     vinod.koul@...el.com, maxime.ripard@...e-electrons.com,
        wens@...e.org, mturquette@...libre.com, sboyd@...eaurora.org,
        lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, lee.jones@...aro.org, mark.rutland@....com,
        robh+dt@...nel.org
Cc:     linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-sunxi@...glegroups.com, thomas.petazzoni@...e-electrons.com,
        mylene.josserand@...e-electrons.com,
        alexandre.belloni@...e-electrons.com
Subject: [PATCH 03/14] ASoC: sun4i-i2s: Add apb reset

Add APB deassert function for sun4i-i2s driver.

Signed-off-by: Mylène Josserand <mylene.josserand@...e-electrons.com>
---
 sound/soc/sunxi/sun4i-i2s.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
index 687a8f8..f3f7026 100644
--- a/sound/soc/sunxi/sun4i-i2s.c
+++ b/sound/soc/sunxi/sun4i-i2s.c
@@ -17,6 +17,7 @@
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
+#include <linux/reset.h>
 
 #include <sound/dmaengine_pcm.h>
 #include <sound/pcm_params.h>
@@ -589,6 +590,7 @@ static int sun4i_i2s_probe(struct platform_device *pdev)
 {
 	struct sun4i_i2s *i2s;
 	struct resource *res;
+	struct reset_control *reset_apb;
 	void __iomem *regs;
 	int irq, ret;
 
@@ -626,7 +628,19 @@ static int sun4i_i2s_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "Can't get our mod clock\n");
 		return PTR_ERR(i2s->mod_clk);
 	}
-	
+
+	reset_apb = devm_reset_control_get(&pdev->dev, "apb_reset");
+	if (IS_ERR(reset_apb)) {
+		dev_err(&pdev->dev, "Can't get apb reset\n");
+		return PTR_ERR(i2s->mod_clk);
+	}
+
+	ret = reset_control_deassert(reset_apb);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Can't deassert apb reset (%d)\n", ret);
+		return ret;
+	}
+
 	i2s->playback_dma_data.addr = res->start + SUN4I_I2S_FIFO_TX_REG;
 	i2s->playback_dma_data.maxburst = 4;
 
-- 
2.9.3