ASoC: kirkwood: fix loss of external clock at probe time

At probe time, when the clock driver is not yet initialized, the
external clock of the kirkwood sound device will not be usable.

This patch fixes this problem defering the device probe.

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/sound/soc/kirkwood/kirkwood-i2s.c b/sound/soc/kirkwood/kirkwood-i2s.c
index 0f3d73d4ef48..3e59af983527 100644
--- a/sound/soc/kirkwood/kirkwood-i2s.c
+++ b/sound/soc/kirkwood/kirkwood-i2s.c
@@ -496,7 +496,10 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
                 return err;
 
         priv->extclk = devm_clk_get(&pdev->dev, "extclk");
-        if (!IS_ERR(priv->extclk)) {
+        if (IS_ERR(priv->extclk)) {
+                if (PTR_ERR(priv->extclk) == -EPROBE_DEFER)
+                        return -EPROBE_DEFER;
+        } else {
                 if (priv->extclk == priv->clk) {
                         devm_clk_put(&pdev->dev, priv->extclk);
                         priv->extclk = ERR_PTR(-EINVAL);