大家好：
我把davinci-mcasp.c davinci-mcasp.h edma-pcm.c edma-pcm.h 拷贝出来主要是修改davinci-mcasp.c文件
我的目的是想将mcasp7驱动起来--准备配置为采样--而且作为主
我是这样做的：
第一步：打开arch/arm/boot/dts/dra7.dtsi
添加节点
mcasp7: mcasp@48478000 {
1693 compatible = "ti,dra7-mcasp-audio";
1694 ti,hwmods = "mcasp7";
1695 reg = <0x48478000 0x2000>,
1696 <0x48450000 0x1000>;
1697 reg-names = "mpu","dat";
1698 interrupts = <GIC_SPI 159 IRQ_TYPE_LEVEL_HIGH>,
1699 <GIC_SPI 158 IRQ_TYPE_LEVEL_HIGH>;
1700 interrupt-names = "tx", "rx";
1701 dmas = <&edma_xbar 141>, <&edma_xbar 140>;
1702 dma-names = "tx", "rx";
1703 clocks = <&mcasp7_ahclkx_mux>;
1704 clock-names = "fck";
1705 status = "enabled";
1706 };
第二步：修改驱动文件
/*定义平台驱动*/
1938 static struct platform_driver davinci_mcasp_driver = {
1939 .probe = davinci_mcasp_probe,
1940 .remove = davinci_mcasp_remove,
1941 .driver = {
1942 /*驱动的名字*/
1943 .name = "davinci-mcasp7",
1944 /*设备树*/
1945 .of_match_table = mcasp_dt_ids,
1946 },
1947 };
1389 static const struct snd_soc_component_driver davinci_mcasp_component = {
1390 .name = "davinci-mcasp7",
1391 };
1639 static int davinci_mcasp_probe(struct platform_device *pdev)
1640 {
1641 struct snd_dmaengine_dai_dma_data *dma_data;
1642 struct resource *mem, *ioarea, *res, *dat;
1643 struct davinci_mcasp_pdata *pdata;
1644 struct davinci_mcasp *mcasp;
1645 char *irq_name;
1646 int *dma;
1647 int irq;
1648 int ret;
1649
1650 printk(KERN_EMERG"davinci_mcasp_probe\n");
第三步：测试
我在ubuntu14.04下交叉编译为.ko文件，scp到开发板中
insmod后，发现没有执行 davinci_mcasp_probe函数，是设备没有匹配成功
问题： 1 想知道自己那里写错了
2 在开发板中驱动mcasp7需要mknod吗？
我将驱动文件上传，渴望得到帮助，太谢谢了。
