mfd: davinci_voicecodec: Provide a regmap for register I/O

This will be used to support refactoring of the ASoC CODEC driver to use
a regmap.

Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/davinci_voicecodec.c

@@ -27,11 +27,17 @@
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/clk.h>
+#include <linux/regmap.h>
 
 #include <sound/pcm.h>
 
 #include <linux/mfd/davinci_voicecodec.h>
 
+static struct regmap_config davinci_vc_regmap = {
+	.reg_bits = 32,
+	.val_bits = 32,
+};
+
 static int __init davinci_vc_probe(struct platform_device *pdev)
 {
 	struct davinci_vc *davinci_vc;
@@ -63,6 +69,14 @@ static int __init davinci_vc_probe(struct platform_device *pdev)
 		goto fail;
 	}
 
+	davinci_vc->regmap = devm_regmap_init_mmio(&pdev->dev,
+						   davinci_vc->base,
+						   &davinci_vc_regmap);
+	if (IS_ERR(davinci_vc->regmap)) {
+		ret = PTR_ERR(davinci_vc->regmap);
+		goto fail;
+	}
+
 	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 	if (!res) {
 		dev_err(&pdev->dev, "no DMA resource\n");

include/linux/mfd/davinci_voicecodec.h

@@ -30,6 +30,8 @@
 
 #include <mach/hardware.h>
 
+struct regmap;
+
 /*
  * Register values.
  */
@@ -113,6 +115,7 @@ struct davinci_vc {
 
 	/* Memory resources */
 	void __iomem *base;
+	struct regmap *regmap;
 
 	/* MFD cells */
 	struct mfd_cell cells[DAVINCI_VC_CELLS];