spi控制器驱动模型

#include <linux/clk.h>

#include <linux/dmaengine.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/spi/spi.h>

#include <linux/pm_runtime.h>

#include <linux/scatterlist.h>

static int rockchip_spi_probe(struct platform_device *pdev)

{

    //分配一个spi_master结构 
master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi));

//初始化spi_master结构 
platform_set_drvdata(pdev, master);
..........
1 申请必要的硬件资源，例如中断，DMA通道，DMA内存缓冲区等等；
2 配置SPI控制器的工作模式和参数，使之可以和相应的设备进行正确的数据交换工作；
3 向核心层提供接口，使得设备驱动可以通过核心层访问控制器驱动
4 完成数据消息队列的排队和处理，直到消息队列变空为止；
..........

//向核心层 注册spi_master
ret = devm_spi_register_master(&pdev->dev, master);

}

static const struct dev_pm_ops rockchip_spi_pm = {
SET_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume)
SET_RUNTIME_PM_OPS(rockchip_spi_runtime_suspend,
  rockchip_spi_runtime_resume, NULL)

};

static const struct of_device_id rockchip_spi_dt_match[] = {
{ .compatible = "rockchip,rk3036-spi", },
{ .compatible = "rockchip,rk3066-spi", },
{ .compatible = "rockchip,rk3188-spi", },
{ .compatible = "rockchip,rk3228-spi", },
{ .compatible = "rockchip,rk3288-spi", },
{ .compatible = "rockchip,rk3368-spi", },
{ .compatible = "rockchip,rk3399-spi", },
{ },

};

MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match);

static struct platform_driver rockchip_spi_driver = {
.driver = {
.name = DRIVER_NAME,
.pm = &rockchip_spi_pm,
.of_match_table = of_match_ptr(rockchip_spi_dt_match),
},
.probe = rockchip_spi_probe,
.remove = rockchip_spi_remove,

};

module_platform_driver(rockchip_spi_driver);

MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>");

MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver");

MODULE_LICENSE("GPL v2");