ARM: Orion: Audio: Add clk/clkdev support

Signed-off-by: Andrew Lunn <[e-mail]>
Tested-by: Jamie Lentin <[e-mail]>
Signed-off-by: Mike Turquette <[e-mail]>

arch/arm/mach-kirkwood/common.c

···
 void __init kirkwood_clk_init(void)
 {
 	struct clk *runit, *ge0, *ge1, *sata0, *sata1, *usb0, *sdio;
-	struct clk *crypto, *xor0, *xor1, *pex0, *pex1;
+	struct clk *crypto, *xor0, *xor1, *pex0, *pex1, *audio;
 
 	tclk = clk_register_fixed_rate(NULL, "tclk", NULL,
 				       CLK_IS_ROOT, kirkwood_tclk);
···
 	xor1 = kirkwood_register_gate("xor1",   CGC_BIT_XOR1);
 	pex0 = kirkwood_register_gate("pex0",   CGC_BIT_PEX0);
 	pex1 = kirkwood_register_gate("pex1",   CGC_BIT_PEX1);
-	kirkwood_register_gate("audio",  CGC_BIT_AUDIO);
+	audio = kirkwood_register_gate("audio",  CGC_BIT_AUDIO);
 	kirkwood_register_gate("tdm",    CGC_BIT_TDM);
 	kirkwood_register_gate("tsu",    CGC_BIT_TSU);
 
···
 	orion_clkdev_add(NULL, MV_XOR_SHARED_NAME ".1", xor1);
 	orion_clkdev_add("0", "pcie", pex0);
 	orion_clkdev_add("1", "pcie", pex1);
+	orion_clkdev_add(NULL, "kirkwood-i2s", audio);
 }
 
 /*****************************************************************************

sound/soc/kirkwood/kirkwood-i2s.c

···
 #include <linux/slab.h>
 #include <linux/mbus.h>
 #include <linux/delay.h>
+#include <linux/clk.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
···
 
 	priv->burst = data->burst;
 
+	priv->clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(priv->clk)) {
+		dev_err(&pdev->dev, "no clock\n");
+		err = PTR_ERR(priv->clk);
+		goto err_ioremap;
+	}
+	clk_prepare_enable(priv->clk);
+
 	return snd_soc_register_dai(&pdev->dev, &kirkwood_i2s_dai);
 
 err_ioremap:
···
 	struct kirkwood_dma_data *priv = dev_get_drvdata(&pdev->dev);
 
 	snd_soc_unregister_dai(&pdev->dev);
+
+	clk_disable_unprepare(priv->clk);
+	clk_put(priv->clk);
+
 	iounmap(priv->io);
 	release_mem_region(priv->mem->start, SZ_16K);
 	kfree(priv);

sound/soc/kirkwood/kirkwood.h

···
 	void __iomem *io;
 	int irq;
 	int burst;
+	struct clk *clk;
 };
 
 #endif