ARM: imx: convert audmux to a platform driver

It coverts audmux to a platform driver, so that it can be moved into
sound/soc/imx and adopt device tree support later.

Signed-off-by: Richard Zhao <richard.zhao@linaro.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/arch/arm/mach-imx/mm-imx25.c b/arch/arm/mach-imx/mm-imx25.c
index cc4d152..153b457 100644
--- a/arch/arm/mach-imx/mm-imx25.c
+++ b/arch/arm/mach-imx/mm-imx25.c
@@ -83,6 +83,10 @@
 	.script_addrs = &imx25_sdma_script,
 };
 
+static const struct resource imx25_audmux_res[] __initconst = {
+	DEFINE_RES_MEM(MX25_AUDMUX_BASE_ADDR, SZ_16K),
+};
+
 void __init imx25_soc_init(void)
 {
 	/* i.mx25 has the i.mx31 type gpio */
@@ -93,4 +97,7 @@
 
 	/* i.mx25 has the i.mx35 type sdma */
 	imx_add_imx_sdma("imx35-sdma", MX25_SDMA_BASE_ADDR, MX25_INT_SDMA, &imx25_sdma_pdata);
+	/* i.mx25 has the i.mx31 type audmux */
+	platform_device_register_simple("imx31-audmux", 0, imx25_audmux_res,
+					ARRAY_SIZE(imx25_audmux_res));
 }