#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)
{
    //分配一個spi_master結構 
master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi));

//初始化spi_master結構 
platform_set_drvdata(pdev, master);
..........
1 申請必要的硬體資源，例如中斷，DMA通道，DMA記憶體緩衝區等等；
2 配置SPI控制器的工作模式和引數，使之可以和相應的裝置進行正確的資料交換工作；
3 向核心層提供介面，使得裝置驅動可以通過核心層訪問控制器驅動
4 完成資料訊息佇列的排隊和處理，直到訊息佇列變空為止；
..........

//向核心層 註冊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 <

[email protected]>");
MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver");
MODULE_LICENSE("GPL v2");