ALSA: ASoC: fix pxa2xx-i2s clk_get call

pxa2xx-i2s: probe actual device and use it for clk_get call
thus fixing error during startup hook

Signed-off-by: Dmitry Baryshkov <[e-mail]>
Acked-by: Mark Brown <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

sound/soc/pxa/pxa2xx-i2s.c

···
 #include <linux/device.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
+#include <linux/platform_device.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/initval.h>
···
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 
-	clk_i2s = clk_get(NULL, "I2SCLK");
 	if (IS_ERR(clk_i2s))
 		return PTR_ERR(clk_i2s);
 
···
 	pxa_gpio_mode(gpio_bus[pxa_i2s.master].tx);
 	pxa_gpio_mode(gpio_bus[pxa_i2s.master].frm);
 	pxa_gpio_mode(gpio_bus[pxa_i2s.master].clk);
+	BUG_ON(IS_ERR(clk_i2s));
 	clk_enable(clk_i2s);
 	pxa_i2s_wait();
 
···
 };
 
 EXPORT_SYMBOL_GPL(pxa_i2s_dai);
+
+static int pxa2xx_i2s_probe(struct platform_device *dev)
+{
+	clk_i2s = clk_get(&dev->dev, "I2SCLK");
+	return IS_ERR(clk_i2s) ? PTR_ERR(clk_i2s) : 0;
+}
+
+static int __devexit pxa2xx_i2s_remove(struct platform_device *dev)
+{
+	clk_put(clk_i2s);
+	clk_i2s = ERR_PTR(-ENOENT);
+	return 0;
+}
+
+static struct platform_driver pxa2xx_i2s_driver = {
+	.probe = pxa2xx_i2s_probe,
+	.remove = __devexit_p(pxa2xx_i2s_remove),
+
+	.driver = {
+		.name = "pxa2xx-i2s",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init pxa2xx_i2s_init(void)
+{
+	clk_i2s = ERR_PTR(-ENOENT);
+	return platform_driver_register(&pxa2xx_i2s_driver);
+}
+
+static void __exit pxa2xx_i2s_exit(void)
+{
+	platform_driver_unregister(&pxa2xx_i2s_driver);
+}
+
+module_init(pxa2xx_i2s_init);
+module_exit(pxa2xx_i2s_exit);
 
 /* Module information */
 MODULE_AUTHOR("Liam Girdwood, [e-mail], www.wolfsonmicro.com");